Bolthole Index

Clay County, Illinois

Building permits, zoning and land rules in Clay County, Illinois

77Index Score / 100
#6 of 102 in Illinois

Unincorporated Clay County, Illinois generally does not require a county building permit for a home, although the county has not published a direct permit statement and buyers should confirm before building1. Countywide zoning appears absent, but the City of Flora has its own zoning ordinance and adopts its own building codes, so Flora building permits and zoning approval come from the city234. Septic permits and private well permits are handled by the Clay County Health Department, not by a city56.

At a glance

Building permit (unincorporated)
Generally not required, but confirm with Clay County before building1
Countywide zoning
No countywide zoning program identified; confirm parcel-specific rules with the county and municipality2
Septic permit
Required through the Clay County Health Department before installation7
Private well permit
Required through the Clay County Health Department before construction6
RV or tiny-home living
No countywide private-land occupancy rule was confirmed; ask the county and municipality2
Owner-builder
A narrow plumbing exemption applies; no general construction exemption was confirmed8
Inside Flora
Flora has municipal zoning, adopted building codes and local permitting34
Conventional septic soils
Only 3.4% of soils lack severe drain-field limitations9

Who to call

Health department

Clay County Health Department, Division of Environmental Health

Private sewage disposal and private water well permits and inspections in Clay County

(618) 662-4406

601 E 12th St, Flora, IL

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

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Do you need a building permit in Clay County, Illinois?

Unincorporated Clay County generally does not require a county residential building permit, but we could not confirm that answer in a direct county permit statement; request written confirmation for the parcel and project before starting work1. Illinois has had a statewide building-code baseline since 2025, with different treatment for jurisdictions that have and have not adopted local codes10. The state does not perform building-code inspections for privately funded construction; any required inspection is handled by the applicable county or municipality11. Qualifying new residential construction is exempt from the state's certification-of-inspection requirement, but that exemption does not resolve a separate local inspection or occupancy requirement1213. Inside Flora, the city reviews plans, performs inspections and issues permits under its adopted codes4.

Who handles building permits, zoning and septic permits in Clay County, Illinois?

Clay County has not identified a county building department or published an accessible page that directly answers whether unincorporated residential construction needs a county permit1. The State of Illinois does not serve as the local inspection office for privately funded work, so unresolved permit, inspection and occupancy questions must go to the applicable local government11. Ask the Clay County Engineer about setbacks and entrance or culvert requirements before fixing a house location. For septic and well work, contact the Clay County Health Department, Division of Environmental Health, at 601 E 12th St, Flora, IL, or (618) 662-440614. Building permits and zoning approval for projects inside Flora go to Flora's Building & Zoning Department because the city administers zoning and its own adopted codes34. Septic permits stay with the Clay County Health Department, which regulates private sewage disposal systems in Clay County5.

Does Clay County have zoning?

Clay County appears to have no countywide zoning program, but we could not confirm that conclusion in an official county statement2. Do not translate that into no land-use rules: Clay County's official Engineer/Highway page links a building setback ordinance, and its scope and parcel-level effect need confirmation from the County Engineer. Illinois law allows a county zoning ordinance, where one applies, to establish setback lines and height limits by district1516. Flora has municipal zoning for development within the city and territory along its borders shown on the city's official maps3. Louisville requires buildings within village limits to sit at least 20 feet from the front lot line and 10 feet from the side and rear lot lines, subject to stated exceptions and variances17. Before buying, ask the county and relevant municipality in writing about zoning, setbacks, minimum lot size, allowed uses, and overlays for the exact parcel.

How do septic and well permits work in Clay County?

Before installing a private sewage system in Clay County, submit the plan-review application and fee to the Clay County Health Department; approval depends on compliance with the state sewage code, and the department requires at least 24 hours' notice before installation7. The Health Department provides local permit review and inspection, while IDPH regulates covered private sewage systems at the state level1819. Only 3.4% of Clay County soils lack severe limitations for a conventional drain field, so obtain a site evaluation before committing to a house location9. A new or renovated septic system generally cannot be approved when an eligible sanitary sewer is available within 300 feet of residential property, subject to the rule's exceptions20. New private wells require permits and inspections through IDPH and local health departments; Clay County's process calls for a $100 fee and at least 24 hours' notice before construction216.

Can you live in an RV or tiny home on your land in Clay County?

Clay County has not published a confirmed countywide rule allowing or prohibiting long-term RV occupancy or tiny-home occupancy on private land2. Illinois campground licensing does not answer that private-parcel question because it applies to qualifying campgrounds that meet statutory thresholds22. A tiny home intended for occupancy still needs a compliant water source and either a public sewer connection or a code-compliant private sewage system23. Illinois permits specified alternative toilets for human waste, but other domestic wastewater still requires a conventional disposal system, and the septic tank cannot be smaller than 750 gallons24. Manufactured homes follow separate state installation rules, and qualifying parks require licensing25. Ask Clay County and the applicable municipality for a written answer covering full-time occupancy, duration, utilities, setbacks, and address assignment before moving an RV or tiny home onto the parcel.

Building a home in Clay County: the steps, in order

  1. Confirm whether the parcel is unincorporated or inside Flora or another municipality; Flora administers municipal zoning and adopted building codes34.
  1. Ask Clay County for written confirmation of building-permit, local inspection, occupancy, zoning and setback requirements because the county-specific answers remain incompletely documented1211.
  1. Contact the Clay County Health Department at 601 E 12th St, Flora, IL, or (618) 662-4406, and complete septic review before installation147.
  1. If the house needs a private well, obtain the well permit before construction and give the required advance notice6.
  1. If work affects a regulated waterway, floodway, floodplain or wetland, use the joint-permit process; ask IDNR for a free determination of whether authorization and a review fee are required262728.
  1. For access onto a state-maintained road, obtain the required state highway permit before right-of-way or driveway work29.

What should you check before buying land in Clay County?

Start with septic feasibility: only 3.4% of county soils lack severe limitations for a conventional drain field, making an early site evaluation valuable9. Check whether a sanitary sewer is close enough to trigger the state connection rule before budgeting for septic20. Ask Clay County about its building setback ordinance, culvert or entrance policy, and floodplain status because zoning and driveway rules were not fully confirmed. A driveway connecting to a state-maintained route requires a state highway permit29. Land disturbance of at least 1 acre may require state construction-stormwater coverage and an application fee, so include erosion control in early site planning30. Clay County land is mostly gentle, with 96.2% at a slope of 15% or less, while 21.9% is wooded3132. Typical property tax is about 1.6%, with a median annual bill near $1,523 and a typical home value of about $110,745333435.

Watch-outs

  • Clay County has not published a direct answer on residential permits or separate local inspection and occupancy requirements for unincorporated construction; request written confirmation before work begins113.
  • Clay County appears to have no countywide zoning, but parcel-specific setback coverage should be confirmed with the County Engineer2.
  • Rules inside Flora differ because Flora has municipal zoning and its own adopted building codes34.
  • A surface-discharging septic system may need separate pollution-discharge coverage when effluent reaches waters of the United States7.

Sources

  1. Clay County, Illinois - Official Website (2026 county census)
  2. Clay County, Illinois - Official Website (2026 county census)
  3. Zoning Board - Flora, Illinois, quoted and re-checked
  4. Building & Zoning - Flora, Illinois, quoted and re-checked
  5. Private Sewage | Clay County Health Department, quoted and re-checked
  6. Potable Water Supplies | Clay County Health Department, quoted and re-checked
  7. Private Sewage | Clay County Health Department, quoted and re-checked
  8. HB5913 Enrolled — Illinois Plumbing License Law amendment (2026 county census)
  9. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  10. Building Codes and Regulations, quoted and re-checked
  11. Illinois Codes FAQ, quoted and re-checked
  12. 20 ILCS 3105/10.09-1, Certification of inspection, quoted and re-checked
  13. 20 ILCS 3105/10.09-1 — Certification of inspection, quoted and re-checked
  14. Clay County Health Department, Division of Environmental Health (healthdept.org)
  15. ilga.gov (Illinois statewide rule), quoted and re-checked
  16. 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
  17. Municipal Code – Village of Louisville, quoted and re-checked
  18. Private Sewage Disposal, quoted and re-checked
  19. Private Sewage Disposal, quoted and re-checked
  20. ilga.gov, quoted and re-checked
  21. Private Water & Closed Loop Wells | Illinois Department of Public Health, quoted and re-checked
  22. Youth Camps and Campgrounds, quoted and re-checked
  23. Section 890.170 Sewer and/or Water Required, quoted and re-checked
  24. Section 905.130 Human Waste Disposal, quoted and re-checked
  25. Manufactured & Modular Homes/Mobile Structures, quoted and re-checked
  26. Permit Application and Instructions, quoted and re-checked
  27. Permit Programs, quoted and re-checked
  28. Illinois Permit Application Fees - Water Resources, quoted and re-checked
  29. Highway Permits (Illinois statewide rule), quoted and re-checked
  30. NPDES Permit For Construction Activities, quoted and re-checked
  31. Share of land at 15% slope or less: Bolthole Index county data
  32. Wooded share of land: Bolthole Index county data
  33. Effective property tax rate: Bolthole Index county data
  34. Median property tax bill: Bolthole Index county data
  35. Typical home value (Zillow): Bolthole Index county data

Written October 9, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like 4 of its 6 neighbors, Clay County has no countywide zoning.

RuleClay CountyEffingham CountyRichland CountyMarion CountyJasper CountyWayne CountyFayette County
Building permitNot requiredNot requiredRequiredLimitedNot requiredNot requiredLimited
County zoningNoNoNoYesNoNoYes
Septic permitsCounty Health Dept.County Health Dept.IL Dept. of Public HealthCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.

County locator

Clay County in Illinois

77
County map
Clay County highlighted among the Illinois counties · colored by Index score

How Clay County scores

Seclusion68100% ev.
Self-Sufficiency69100% ev.
Admin Boringness8090% ev.
Durability57100% ev.
Property Autonomy42100% ev.
Carry Cost65100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$111kTypical home
1.6%Property tax
$6,235Land / acre
45.9"Annual rain
2% of yrsSevere drought
12 / yr (+10.8)Mid-century 100°F days
15.7 daysMid-century dry spell
1.88" (+7.9%)Mid-century 1-day rain
1.86×Wildfire change factor
100%Forward climate coverage
$1,469Home insurance / yr
3.9% / yrInsurance growth
0.67%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
8,008People within 30 min
1,793,549People within 2 hr
16,376Radius comparison (15 mi)
27.8People / sq mi
0.1%Federal land
96.2%Land at 15% slope or less
3.4%Soils rated "not limited" for septic (strict USDA rating)
10,055 acWorkable land screen
21.9%Wooded land
57.9 tonsBiomass / forest ac
54.9°FAvg temp

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Cities and towns in Clay County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Bible Grove Township · Blair Township · Clay City Township · Village of Clay City · Flora · Harter Township · Hoosier Township · Village of Iola · Larkinsburg Township · Louisville Township · Village of Louisville · Oskaloosa Township · Pixley Township · Village of Sailor Springs · Songer Township · Stanford Township · Xenia Township · Village of Xenia

Answers from the rulebook for Clay County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Clay County rules

  • Who permits septicLocal

    Local review of private sewage disposal system construction plans in Clay County by the Clay County Health Department as the county health agency listed by IDPH.

    • IDPH states that local health agencies review sewage disposal system construction plans either under local ordinance or as agents of IDPH.
    • The IDPH directory identifies the Clay County Health Department as serving Clay County.
    “Program activities include the issuance of construction permits, the inspection of new or existing sewage disposal systems, and complaint investigations. The program regulates all private sewage disposal systems that treat a flow of 1,500 gallons per day or less.”
    One more reviewed finding on this topic
    • County — Private sewage disposal permitting and inspections in Clay County
      “Program activities include the issuance of construction permits, the inspection of new or existing sewage disposal systems, and complaint investigations. The program regulates all private sewage disposal systems that treat a flow of 1,500 gallons per day or less.”
  • Septic permitRequired

    Installation of a private sewage disposal system in Clay County

    • Before installation, a Private Sewage Disposal Plan Review Application and application fee must be submitted to the Health Department for approval.
    • A permit is granted only if the proposed system meets the IDPH Private Sewage Disposal Code and Private Sewage Disposal Licensing Act.
    • The applicant must notify the health department at least 24 hours before installation.
    • Surface-discharging systems discharging to Waters of the United States also require NPDES General Permit coverage; the Clay County page states that permit took effect February 10, 2014.

    notification lead time: >= 24 hours minimum

    “Before a private sewage disposal system can be installed in Clay County, a Private Sewage Disposal Plan Review Application and an application fee must be submitted to the Health Department for approval. The applicant will be granted a permit if the proposed system meets the requirements of the IDPH Private Sewage Disposal Code and the Private Sewage Disposal Licensing Act. It is the applicant’s responsibility to notify the health department a minimum of 24 hours prior to installation.”
  • Well permitRequired

    Construction of a private water well in Clay County

    • An application and $100 application fee payable to IDPH must be submitted to the Clay County Health Department before construction.
    • The applicant must notify the health department at least 24 hours before construction.
    • The county program also issues construction permits and inspects new water well construction.

    application fee: 100 USD (Payable to the Illinois Department of Public Health.) · construction notification lead time: >= 24 hours minimum

    “Clay County Health Department administers the private water program under the authority of the Illinois Water Well Construction Code. Before a private water well can be constructed in Clay County an application and the $100.00 application fee, payable to the Illinois Department of Public Health, must be submitted to the Clay County Health Department. It is the applicant’s responsibility to notify the health department a minimum of 24 hours prior to construction.”
  • County-wide zoningAbsent

    The county's own offices list no planning or zoning department; only individual townships (e.g., Clay Township) have their own zoning ordinances, indicating no countywide zoning.

    Clay County, Illinois - Official Website ↗Scouted from the county site, not yet independently re-checked

Illinois rules that apply here

  • Building permitLimited

    Privately funded construction in Illinois; the State does not itself issue building permits, while any required permit is addressed by the applicable local government.

    • Permit requirements may be imposed and administered by the municipality, village, city, or county having jurisdiction.
    • The Illinois Capital Development Board states that statewide building codes became effective 1/1/2025, while local code officials remain the best source for project-specific answers.

    statewide building-code effective date: 2025-01-01

    “No. If any of these are required, they would be addressed by the unit of local government.”
    One more reviewed finding on this topic
    • Not required — Issuance of building permits by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • Owner-builder exemptionConditional

    Owner occupants or lessee occupants of single-family residences, and owners of single-family residences under construction for their own occupancy, performing plumbing planning, installation, alteration, or repair in Illinois.

    • The exemption is limited to plumbing work on the specified single-family residence; the cited statute does not establish a general owner-builder exemption for all construction trades or a statewide exemption from building permits.
    • The plumbing must comply with the minimum standards in the Illinois State Plumbing Code.
    • The plumbing is subject to inspection by the Illinois Department of Public Health or by the local governmental unit if it retains a licensed plumber as inspector.
    • The owner, owner occupant, or lessee occupant may not employ anyone other than a plumber licensed under the Illinois Plumbing License Law to assist.
    • An occupant must have taken possession of and be living in the premises as their bona fide sole and exclusive residence, or, for a residence under construction, expect to take possession and live there as that residence, with current intent to live there for at least 6 months after completion of the plumbing work or, for a residence under construction, at least 6 months after completion of construction.
    • Failure to possess and live in the premises as a sole and exclusive residence for 6 months or more creates a rebuttable presumption that the required intent was lacking.

    minimum occupancy period: >= 6 months (After completion of plumbing work; for a residence under construction, after completion of construction.)

    “Nothing herein contained shall prohibit the owner occupant or lessee occupant of a single family residence, or the owner of a single family residence under construction for his or her occupancy, from planning, installing, altering or repairing the plumbing system of such residence”
    2 more reviewed findings on this topic
    • Conditional — Privately funded construction in Illinois, including projects performed by an owner-builder, as to state-issued building permits, state plan review, state building-code inspections, and state occupancy permits.
      “No. If any of these are required, they would be addressed by the unit of local government.”
    • Conditional — Statewide treatment of local plumbing permits and inspections for qualifying owner occupants performing plumbing work on a single-family residence.
      “Nothing contained in this Act shall prohibit any city, town, village, township or county from providing for a Plumbing Inspector or from requiring permits for the installation and repair of plumbing and collecting a fee therefor, but a city, town, village, township, or county that requires a permit for installation and repair of plumbing may not issue that permit without verification that the applicant has a valid plumbing license or that the applicant is the owner occupant of a single family residence that is the subject of the permit.”
  • Building code adoptedPartial

    Building-code requirements statewide in Illinois, including residential and commercial construction subject to the Capital Development Board Act baseline requirements.

    • Effective 2025-01-01, Illinois requires statewide baseline building-code requirements.
    • Local governments may adopt building codes, but they are not required to adopt codes; jurisdictions that do not adopt a code are treated as non-building-code jurisdictions and must follow the applicable state-law baseline requirements.
    • For jurisdictions with adopted codes, local codes must regulate structural design at least as stringently as the applicable IRC, IBC, or IEBC baseline.
    • Commercial buildings in non-building-code jurisdictions and state-funded buildings are subject to the state-listed codes and qualified-inspection requirements.
    • Residential requirements differ depending on whether the jurisdiction has adopted a compliant building code and whether the home purchaser and builder agree to an alternative code.

    statewide baseline effective date: 2025-01-01 · local code structural minimum for residential buildings: IRC minimum structural requirements · local code structural minimum for commercial new buildings: IBC minimum structural requirements · local code structural minimum for existing commercial buildings: IEBC minimum structural requirements

    “The State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide building codes effective 1/1/2025. [...] Commercial buildings in jurisdictions that have not adopted a building code AND state funded buildings. [...] Starting 1/1/25 local codes must regulate the structural design in a manner that is at least as stringent as the IBC© for new buildings or IEBC© for existing buildings. [...] Residential buildings in jurisdictions that have not adopted a building code where agreed to by the home purchaser and home builder. [...] Residential buildings in jurisdictions that have adopted a building code. [...] Starting 1/1/25 local codes must regulate the structural design in a manner that is at least as stringent as the IRC©.”
    3 more reviewed findings on this topic
    • Adopted (with conditions) — Statewide Illinois building-code baseline applicable to jurisdictions including Clay County, subject to the statutory distinctions for jurisdictions that have or have not adopted local building codes.
      “The State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide building codes effective 1/1/2025. Until then, units of local government such as cities and counties can adopt codes of their choice.”
    • Adopted (with conditions) — Statewide Illinois building-code baseline applicable to construction in Illinois, including Clay County, subject to the distinctions and conditions in the Capital Development Board materials.
      “The State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide building codes effective 1/1/2025.”
    • Adopted — Statewide baseline building-code requirements for residential construction in Illinois, including jurisdictions with and without locally adopted building codes.
      “Please be advised that the State of Illinois recently passed legislation (Public Act 103-0510) changing the Capital Development Board Act to require statewide baseline building codes effective 1/1/2025. Locally adopted building codes must comply with the requirements of the Act.”
  • InspectionsLimited

    New residential construction in Illinois, including qualifying construction in Clay County

    • The exemption is subject to the exception in Section 15 of the Illinois Residential Building Code Act.
    • New residential construction means original construction of a single-family home or a dwelling containing 2 or fewer apartments, condominiums, or townhouses.
    • The changes made by Public Act 103-510 apply beginning January 1, 2025.
    • This claim addresses the state certification-of-inspection requirement and does not establish whether Clay County imposes a separate local inspection requirement.

    effective date: 2025-01-01

    “(e) Except as provided in Section 15 [...] new residential construction is exempt from this Section. [...] (h) [...] apply beginning on January 1, 2025.”
    3 more reviewed findings on this topic
    • Limited — Privately funded construction, including construction in Clay County, Illinois
      “Does the State perform plan reviews, issue building permits, perform inspections for building code compliance or issue occupancy permits for privately funded construction? No. If any of these are required, they would be addressed by the unit of local government.”
    • Not required — Building-code-compliance inspections performed by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
    • Limited — Privately funded construction statewide in Illinois, as to inspections performed by the State rather than by a local authority having jurisdiction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • Certificate of occupancyNot required

    The state statutory certification-of-inspection prerequisite to occupancy under 20 ILCS 3105/10.09-1 for new residential construction in a non-building-code jurisdiction, including qualifying residential construction in Clay County.

    • This is limited to the certification-of-inspection requirement in 20 ILCS 3105/10.09-1 and is not a determination that Clay County or an incorporated municipality does not require a separate certificate of occupancy.
    • The exemption is subject to Section 15 of the Illinois Residential Building Code Act.
    • New residential construction means original construction of a single-family home or a dwelling containing 2 or fewer apartments, condominiums, or townhouses.
    • The statutory changes apply beginning January 1, 2025.
    “(e) Except as provided in Section 15 of the Illinois Residential Building Code Act, new residential construction is exempt from this Section”
    2 more reviewed findings on this topic
    • Not required — Issuance of occupancy permits or certificates by the State of Illinois for privately funded construction.
      “No. If any of these are required, they would be addressed by the unit of local government.”
    • Limited — Occupancy permits or certificates for privately funded construction in Illinois.
      “No. If any of these are required, they would be addressed by the unit of local government.”
  • SetbacksDistrict specific (with conditions)

    County zoning regulations for building or setback lines outside municipalities with municipal zoning ordinances.

    • The actual setback distances are established by applicable county zoning districts or other local ordinances.
    • Agricultural buildings may be required to conform to building or setback lines.
    “to establish building or setback lines”
  • Building heightDistrict specific (with conditions)

    County zoning districts outside municipalities with municipal zoning ordinances.

    • The applicable county zoning ordinance determines the actual height limit by district or use.
    • No single statewide height measurement was identified.
    “including height of buildings and structures”
  • Manufactured homesAllowed (with conditions)

    Occupancy of manufactured homes as dwellings, including occupancy in manufactured home communities regulated by IDPH.

    • Manufactured home communities with 5 or more sites must be licensed by IDPH, except communities located in home rule units.
    • IDPH annually inspects licensed communities for renewal, including water, sewage disposal, electrical systems, lighting, roads, spacing of homes, and garbage disposal.
    • Manufactured homes moved since January 1, 1980 must be secured using equipment meeting IDPH standards.
    • Effective December 31, 2001, manufactured homes must be installed by an Illinois licensed manufactured home installer or the homeowner and installed according to manufacturer instructions; if unavailable, the IDPH Manufactured Home Installation Code applies.
    • Local zoning, building, floodplain, and utility requirements may also apply.

    manufactured home community license threshold: >= 5 sites (Communities located in home rule units are excepted from this IDPH licensing statement.) · moved-home tiedown requirement effective date: >= 1980-01-01 · installation requirement effective date: >= 2001-12-31

    “designed and situated so as to permit its occupancy as a dwelling place for one or more persons”
    One more reviewed finding on this topic
    • Limited — Manufactured-home communities and manufactured-home installation in Clay County, Illinois.
      “IDPH licenses all parks with 5 or more sites (except those located in home rule units).”
  • Septic inspectionLimited

    New and replacement surface-discharging private sewage disposal systems covered by Illinois EPA general NPDES Permit ILG62.

    • Coverage under the general permit is limited to eligible dischargers.
    • Systems not eligible for general-permit coverage may require an individual NPDES permit.
    • Periodic inspection, monitoring, and reporting are required under the permit.
    “The permit sets discharge limits and requires periodic inspection, monitoring and reporting.”
  • Off-grid sanitationAllowed (with conditions)

    Off-grid disposal of human wastes through privies, portable toilets, recirculation toilets, incinerator toilets, and compost toilets statewide in Illinois.

    • Other domestic wastes must be disposed of in a conventional private sewage disposal system.
    • Compost toilets may also be used for other organic domestic wastes.
    • Privies have construction, capacity, venting, maintenance, and abandonment requirements.
    • A privy pit must have a minimum capacity of 50 cubic feet per seat.
    • A privy must be pumped when filled to within 18 inches of the bottom of the riser.
    • Vault privies are required where groundwater or limestone formations are within 4 feet of the bottom of the pit.
    • Recirculating toilets must meet NSF International/ANSI Standard 41 and residuals must go to an approved public or private sewage disposal system.
    • Incinerator and compost toilets have separate maintenance and disposal requirements; compost toilets must meet NSF International/ANSI Standard 41.

    privy pit minimum capacity: >= 50 cubic feet per seat · privy pumping trigger: <= 18 inches from bottom of riser (Pump when filled to within this distance.) · vault-privy groundwater or limestone separation: < 4 feet from bottom of pit (Watertight, non-metal vaults are required where the condition applies.)

    “Privies, portable toilets, recirculation toilets, incinerator toilets and compost toilets are approved for private sewage disposal of human wastes.”
    One more reviewed finding on this topic
    • Limited — Human-waste disposal and other domestic wastewater for occupied buildings in Clay County
      “Privies, portable toilets, recirculation toilets, incinerator toilets and compost toilets are approved for private sewage disposal of human wastes. Other domestic wastes shall be disposed of in a conventional system (see Section 905.30); however, the size of all components, as designed in accordance with Appendix A, Illustration A, may be reduced 25 percent (except that septic tanks may not be smaller than 750 gallons).”
  • Mandatory utility hookupConditional

    Private sewage disposal systems in Clay County where an IEPA-permitted sanitary sewer is available

    • New or renovated private sewage disposal systems may not be approved when an IEPA-permitted sanitary sewer is available for connection.
    • For residential property or non-residential property with sewage flow under 1,500 gallons per day, sewer availability is within 300 feet.
    • For non-residential property with sewage flow of at least 1,500 gallons per day, sewer availability is within 1,000 feet.
    • The availability rule does not apply when a physical barrier or local ordinance prevents connection.
    • A private sewage disposal system may be installed if connection cannot be made with an individual 4-inch line.

    residential or non-residential flow under 1500 gallons per day sewer distance: <= 300 feet (Unless a physical barrier or local ordinance prevents connection.) · non-residential flow at least 1500 gallons per day sewer distance: <= 1000 feet (Unless a physical barrier or local ordinance prevents connection.) · individual sewer connection line: 4 inches (If connection cannot be made with an individual line, a private sewage disposal system may be installed.)

    “New or renovated private sewage disposal systems shall not be approved where a sanitary sewer operated and maintained under permit of the Illinois Environmental Protection Agency is available for connection. A sanitary sewer is available for connection when it is within 300 feet of a residential property or a non-residential property with a sewage flow less than 1500 gallons per day, or within 1000 feet of a non-residential property with a sewage flow greater than or equal to 1500 gallons per day, unless a physical barrier or local ordinance exists that prevents connection to the sewer. If connection from the property to the sanitary sewer cannot be made with an individual line (i.e., 4" inch line), then a private sewage disposal system may be installed.”
    One more reviewed finding on this topic
    • Conditional — Buildings intended for human habitation or occupancy in Clay County, subject to Illinois Plumbing Code
      “Each building which is intended for human habitation or occupancy shall have a connection to a public water system, a semi-private water system, or a private water supply constructed in accordance with the requirements of the Illinois Water Well Construction Code (77 Ill. Adm. Code 920) or the Surface Source Water Treatment Code ( 77 Ill. Adm. Code 930), and a connection to a public sewer system or private sewage disposal system constructed to the requirements of the Illinois Private Sewage Disposal Code (77 Ill. Adm. Code 905).”
  • Driveway accessRequired

    Work within the right-of-way of an Interstate, U.S. state route, Illinois state route, or state-maintained roadway, including access-driveway requests to State highways.

    • A permit must be obtained before work begins.
    • Requirements may vary by IDOT district; the applicant must contact the district office for specific requirements.
    • IDOT's access-driveway handbook guides what is allowable for highway access requests.
    “Per 605 ILCS 5/4 209, IDOT requires a permit when working within the right-of-way of an Interstate, U.S. state route, Illinois state route, or state maintained roadway. A permit must be obtained prior to the start of any work and a copy of the approved permit must be at the worksite at all times.”
  • Building in a floodplainRequired

    Construction in floodways and, where a floodway has not been delineated, work in floodplains in Clay County under Illinois Department of Natural Resources floodway and floodplain rules.

    • The rules affect all streams and lakes except those in northeastern Illinois regulated under Part 3708.
    • Floodway construction must be permitted before construction in urban areas where the stream drainage area is one square mile or more or rural areas where it is ten square miles or more.
    • If a floodway has not been previously delineated, the Division generally requires permits for work anywhere in the floodplain.
    • Common minor construction activities may be automatically authorized by statewide permits; no application is needed when the activity meets the statewide permit terms and conditions.

    urban stream drainage area threshold: >= 1 square mile (For floodway construction under Part 3700.) · rural stream drainage area threshold: >= 10 square miles (For floodway construction under Part 3700.)

    “must be permitted by the Division prior to construction.”
    One more reviewed finding on this topic
    • Required — Construction activities in regulated Illinois floodways and, where a floodway has not been delineated, generally work anywhere in the floodplain.
      “All construction activities in the floodways of streams (the channel and the adjacent portion of the floodplain that is needed to safely convey and store flood waters) in urban areas where the stream drainage area is one square mile or more or in rural areas where the stream drainage area is ten square miles or more must be permitted by the Division prior to construction.”
  • Short-term rentalsLimited

    Short-term rentals in Illinois where at least one room is rented for fewer than 30 consecutive days and accommodations are reserved in advance, when the hosting platform meets the statutory definition of a re-renter.

    • Beginning July 1, 2025, qualifying hosting platforms are subject to Hotel Operators’ Occupation Tax.
    • The source establishes tax and registration obligations, not statewide land-use permission; local zoning and licensing may separately apply.

    rental period: < 30 consecutive days

    “Beginning July 1, 2025, hosting platforms for short-term rentals that meet the definition of “re-renter” are subject to Hotel Operators’ Occupation Tax.”
  • Permit feesVariable (with conditions)

    IDNR Office of Water Resources permit application review fees for activities in Illinois public waters, floodways of Illinois streams, and covered dam activities, including such activities in Clay County.

    • A permit application review fee is required when a permit is required and the activity is not already covered by Statewide Permit authorization.
    • Applications and written inquiries are reviewed free of charge to determine whether authorization is required when sufficient information is provided for that determination.
    • If authorization is not required or the activity is already covered by Statewide Permit authorization, no permit application review fee is required.
    • The fee is non-refundable except for overpayments.
    • The applicant is notified in writing of the fee determination after initial review; continued review will not proceed without payment.
    • The application is deemed withdrawn if the fee is not received within 90 days after notification of the amount.
    • Fees are based on estimated professional and administrative staff time, with a standard activity structure ranging from $200 to $5,000 and a $5,000 cap.
    • If multiple IDNR Office of Water Resources authorizations are required, the applicable review fees are added together, subject to the $5,000 cap.
    • The review fee is adjusted on July 1 each year using the CPI-U and rounded to the nearest $10.
    • The cited fee notice states that the fiscal-year-2026 schedule was effective July 1, 2025 through June 30, 2026.

    standard activity fee range: 200-5000 USD (The review fee is capped at $5,000.) · fee effective date: 2014-01-15 · fiscal-year-2026 permit-required determination fee: 0 USD (The determination review is free; a non-refundable review fee applies if a permit is required and not covered by Statewide Permit authorization.) · fiscal-year-2026 example general-permit construction fee: 690 USD (Construction activities must meet the terms and conditions of a general permit.)

    “If a permit is required for the activity proposed and is not already permitted by Statewide Permit authorization, permit applicants must pay a non-refundable”
    2 more reviewed findings on this topic
    • Published (with conditions) — Illinois EPA initial NPDES construction stormwater permit application fees for construction activities in Clay County that require permit coverage.
      “Projects with less than 5 acres, the fee is $250. Projects with 5 acres or more, the fee is $750.”
    • Variable (with conditions) — Applications and written inquiries for Illinois Department of Natural Resources public-water, dam, and floodway work requiring authorization.
      “January 15, 2014, a new Permit Application Fee went into effect. All applications and written inquiries received will be reviewed free of charge to determine whether the Public Water, dam and/or floodway work proposed requires authorization by the Department, so long as sufficient information is provided for the Department to make that determination.”
  • Permit processPartial

    State and federal authorization process for construction projects in waterways, floodplains, and wetlands in Clay County.

    • Projects often require both State and Federal authorization.
    • The joint application seeks project authorizations from the U.S. Army Corps of Engineers, Illinois Department of Natural Resources, Office of Water Resources, and Illinois Environmental Protection Agency.
    • The page provides application forms, instructions, and a Permit Fee Notice, but does not establish the complete county-level process.
    “Construction projects in Illinois' waterways, floodplains and wetlands often require both State and Federal authorization.”
    One more reviewed finding on this topic
    • Published (with conditions) — Construction projects in Illinois waterways, floodplains, and wetlands seeking State and Federal authorizations through the joint permit application process.
      “Construction projects in Illinois' waterways, floodplains and wetlands often require both State and Federal authorization. This joint application is designed to simplify the approval process for the applicant seeking project authorizations from the U. S. Army Corps of Engineers, the Illinois Department of Natural Resources, the Office of Water Resources and the Illinois Environmental Protection Agency.”
  • Campground & park staysAllowed (with conditions)

    Overnight camping in Illinois campgrounds subject to the Campground Licensing and Recreational Area Act.

    • IDPH annually inspects and licenses campgrounds in Illinois.
    • The state campground definition includes camping and temporary parking of recreational vehicles.
    • Campgrounds within home rule units of government are exempt from the state campground licensing requirement.
    • Recreational areas without overnight camping, such as highway rest stops and picnicking areas, are subject to the rules but are not licensed or routinely inspected.

    minimum persons for statutory campground threshold: >= 10 persons · minimum camping duration for statutory campground threshold: >= 6 camping days per calendar year

    ““Camping Day” means any 24 hour period or portion thereof during which the participants remain overnight at the site.”
    One more reviewed finding on this topic
    • Limited — Temporary camping and temporary recreational-vehicle parking in campgrounds located in Clay County, Illinois.
      “for 10 or more persons for six or more camping days during a calendar year.”
  • county building authorityLimited

    County building-construction and building-code regulation, including residential structures, in counties meeting the statutory population and metropolitan-area conditions.

    • The county must have a population not in excess of 1,000,000.
    • The county must be located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission.
    • Rules are subject to rules or regulations adopted by the State Fire Marshal under the cited gasoline and volatile-oils statute.
    • The county must exempt municipalities located wholly or partly within the county when the municipal building code is equal to the county regulation and local authorities are enforcing that municipal code.
    • The rules apply throughout the county, but municipalities may establish higher standards.
    • The rules do not apply to construction or alteration of buildings or structures used or to be used for agricultural purposes on a tract zoned and used for agricultural purposes.
    • The county board must follow the publication and posting requirements in 55 ILCS 5/5-1063.
    • Beginning on the effective date of the amendatory Act of the 92nd General Assembly, a county adopting a new building code or amending an existing building code must provide the building-code identification to the Capital Development Board under Section 10.18 at least 30 days before adoption.
    • Violations are petty offenses, and enforcement is by an officer designated by county-board resolution.
    • The provision expressly authorizes county building-construction and building-code rules, but the opened text does not expressly use the phrase residential building permit requirement.

    population threshold: <= 1000000 persons (The county must be located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission.) · pre-adoption identification period: >= 30 days (Applies to a new building code or amendment under the stated amendatory-Act provision.)

    “The county board in any county with a population not in excess of 1,000,000 located in the area served by the Northeastern Illinois Metropolitan Area Planning Commission may prescribe by resolution or ordinance reasonable rules and regulations (a) governing the construction and alteration of all buildings and structures and parts and appurtenances thereof and governing the maintenance thereof in a condition reasonably safe from the hazards of fire, explosion, collapse, contagion and the spread of infectious disease”
    One more reviewed finding on this topic
    • General — Illinois counties adopting and enforcing building codes and issuing building permits for residential construction in unincorporated areas, subject to the statewide baseline framework.
      “A municipality or county is not required to adopt building codes. If they do NOT adopt a building code then they are considered a non-building code jurisdiction and section 10.09-1 of the Capital Development Board Act (20 ILCS 3105) applies. If they do adopt a building code(s) then it must comply with section 10.18 of the Capital Development Board Act (20 ILCS 3105).”

Inside cities and towns in Clay County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Building code adoptedAdopted (with conditions)

    Construction and alterations within the City of Flora, Illinois.

    • The City Building Inspector enforces the adopted codes through plan review and inspections.
    • Residential, commercial, and industrial construction permits are issued after building-plan examination and approval.
    • The City states that a building permit may be needed for building, remodeling, or other construction projects and directs applicants to contact the Building/Zoning Department.
    • The adopted International Residential Code of 2024 includes Amendment R309.2 requiring automatic sprinkler systems for one- and two-family dwellings.
    • The page lists the 2024 International Building Code, 2024 International Residential Code, 2024 International Existing Building Code, 2024 International Mechanical Code, 2024 International Property Maintenance Code, 2024 International Fire Code, 2024 Illinois Energy Conservation Code, 2012 NFPA Life Safety Code, current NFPA 13 and NFPA 72 codes, 2024 International Swimming Pool and Spa Code, State of Illinois Accessibility Code, 2024 International Fuel Gas Code, current Illinois Plumbing Code, and 2023 National Electrical Code.

    International Building Code edition: 2024 · International Residential Code edition: 2024 (Amendment R309.2 requires automatic sprinkler systems for one- and two-family dwellings) · International Existing Building Code edition: 2024 · International Mechanical Code edition: 2024 · International Property Maintenance Code edition: 2024 · International Fire Code edition: 2024 · Illinois Energy Conservation Code edition: 2024 · NFPA Life Safety Code edition: 2012 · National Electrical Code edition: 2023

    “The City has adopted the following editions of the International Codes: The International Building Code of 2024”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Construction and alterations within the City of Flora, including residential, commercial, and industrial construction subject to Flora's Building & Zoning Department.
      “The City has adopted the following editions of the International Codes: The International Building Code of 2024”
  • Local zoningPresent (with conditions)

    Buildings constructed within the corporate limits of the Village of Louisville, Clay County, Illinois.

    • The rule does not apply to buildings constructed upon the Public Square.
    • The Mayor and Board of Trustees may grant a variance for irregular, narrow, shallow, or steep lots or other physical conditions causing unnecessary hardship.
    • The variance must be consistent with the Article's general purpose and intent and not injurious to the neighborhood or otherwise detrimental to the public welfare.
    • The ordinance is identified as Ordinance No. 455, dated 12-12-96.

    front setback: >= 20 feet (Does not apply to buildings on the Public Square.) · side setback: >= 10 feet (Does not apply to buildings on the Public Square.) · rear setback: >= 10 feet (Does not apply to buildings on the Public Square.)

    “twenty (20) feet to the front lot line, [...] ten (10) feet to the side lot line [...] ten (10) feet to the rear lot line”
    One more reviewed finding on this topic
    • Present (with conditions) — Commercial, industrial, and residential development changes within the City of Flora and along its borders.
      “The City of Flora has a zoning ordinance to control commercial, industrial and residential development changes within the city and along its borders.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Zoning districts — Countywide zoning-district publication for Clay County, Illinois.
  • Minimum dwelling size — Minimum floor-area or dwelling-size requirements for residences in Clay County.
  • Minimum lot size — Minimum lot-area requirements for residential or other development in Clay County.
  • Living in an RV — RV occupancy, including long-term or residential occupancy and temporary camping, on private land in Clay County, including unincorporated areas.
  • Tiny homes — Tiny-home occupancy in unincorporated Clay County.
1 more unanswered
  • Accessory dwellings

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Clay County, Illinois

Is Clay County a good place to live off-grid or homestead?

Clay County scores 77/100 on the Bolthole Index, a strong county profile. Its strengths: low administrative friction for a quiet rural property and strong self-sufficiency basics: 45.9″/yr rainfall with little drought.

Do you need a building permit in Clay County, Illinois?

Clay County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Clay County Health Department, Division of Environmental Health. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Clay County, Illinois?

Land in Clay County runs about $6,235 per acre, based on the latest county data.

What is the water situation in Clay County?

Clay County gets about 45.9" of rain a year, with severe drought in roughly 2% of years.

How remote is Clay County?

A representative private-land location has about 8,008 people within a 30-minute drive and 1,793,549 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Clay compares in Illinois

Compare side-by-side →See all 102 Illinois counties ranked →