Outside El Dorado city limits, unincorporated Union County, Arkansas does not require a building permit or business license, according to official El Dorado guidance, and builders are told to contact the Arkansas State Fire Marshal's Office about the statewide Fire Prevention Code12. Inside El Dorado, the city issues building permits and zoning applies34. Septic permits for every address in the county, city or not, run through the Arkansas Department of Health and the Union County Health Unit5.
At a glance
- Building permit
- Not required outside El Dorado city limits1
- Zoning
- El Dorado has its own zoning; whether the county zones unincorporated land is unconfirmed, so ask the County Judge's office46
- Septic permitting authority
- Arkansas Dept. of Health Onsite Wastewater program with the Union County Health Unit; permit and plan approval before construction78
- Owner-builder exemption
- Yes, for your own residence, up to 1 per calendar year910
- Statewide building code
- Arkansas Fire Prevention Code (2021 ed.) applies even without a local permit11
- Nonresidential farm buildings
- Exempt from state electrical-contractor licensing rules12
- RV or tiny home
- Private-parcel occupancy unconfirmed; qualifying parks follow state health rules1314
- Private domestic well
- No separate state Health Department construction approval stated; well-construction rules still apply15
Who to call
Also useful
County administration, quorum-court ordinances, and operation of the county road system for Union County
101 North Washington, Suite 101, El Dorado, Arkansas 71730-5661
Roads & driveways
Union County Highway Department
County road maintenance and access onto county roads
Septic permits
Local point of contact for septic (onsite wastewater) permit questions and water testing in Union County
Septic permits
Arkansas Department of Health, Onsite Wastewater Program
Sets statewide onsite wastewater (septic) policy and reviews permit applications in cooperation with each county health department's Environmental Health Specialist
4815 W. Markham Street, Slot 46, Little Rock, AR 72205
Contact details are copied from each office’s official page and were checked against it on October 9, 2026.
Off-grid gear
Going off-grid in Union County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Union County, Arkansas?
If you are building outside El Dorado city limits, in unincorporated Union County, official El Dorado guidance says no building permit or business license is needed12. That statement comes from city guidance rather than a county ordinance, so confirm with the County Judge's office. The Arkansas Fire Prevention Code applies statewide as a compliance standard even where no local permit program exists, and builders in unincorporated areas are directed to contact the Arkansas State Fire Marshal's Office about compliance112. Inside El Dorado, building permits are required for most work and the El Dorado Fire Department approves city permits, conducts compliance inspections and issues a Certificate of Occupancy when a covered project is complete1617. Confirm the parcel's jurisdiction before relying on the no-permit answer.
Who handles building permits and zoning in Union County, and how do you reach them?
Union County has no listed dedicated building or planning-and-zoning department6, so no county office issues building permits for unincorporated land. For unincorporated land, start with the Union County Judge, whose office administers quorum-court ordinances and operates the county road system; the office is at 101 North Washington, Suite 101, El Dorado, Arkansas 71730-5661, phone (870) 864-190018. For county-road maintenance and access questions, call the Union County Highway Department at (870) 864-190619. A parcel inside El Dorado follows the city's building permit process instead; septic permits still go through the Arkansas Department of Health and the Union County Health Unit: the El Dorado Fire Department approves permits, performs compliance inspections and issues the Certificate of Occupancy after completion1617.
Does Union County have zoning?
We could not confirm whether Union County has enacted zoning for unincorporated land. The county's office directory lists no planning or zoning department, but that is not an official statement that no zoning exists6. Arkansas counties may zone all or part of their unincorporated areas through a county planning board, so the County Judge's office, which administers quorum-court ordinances, is the place to confirm2018. Inside El Dorado, zoning is administered by the city4. We found no minimum lot size, setback or building-height rule for unincorporated Union County, so do not treat the lack of a published number as proof none exists18. If you plan to subdivide or plat land, Arkansas law requires the plat to be filed with the State Surveyor's office after any city or county recording requirements, and for a subdivision using septic systems, no construction can begin on a lot until the Arkansas Department of Health approves the subdivision's onsite wastewater plan2122.
How do septic and well permits work in Union County?
Septic permits in Union County, inside El Dorado or out, go through the Arkansas Department of Health's Onsite Wastewater program, which reviews applications with the county health department's Environmental Health Specialist23. A completed application with detailed plans must be approved by the Department of Health or its authorized agent before a building or residence is constructed, and a permit to operate is needed before the system is used824. The installer must give the authorized agent at least 24 hours' notice before starting work8. The Union County Health Unit, phone (870) 863-5101, is the local point of contact for septic questions and water testing25. If a sanitary sewer is within 300 feet of where the building sewer exits and can be reached without crossing another person's property, Arkansas rules require connection instead of a septic system or privy26. A public or semi-public well needs written Department of Health approval before construction; if the classification is uncertain, the well contractor must obtain a written determination first27. The rules cited here do not state that an ordinary private domestic well needs separate Department of Health construction approval, but contracted well or pump work remains subject to state licensing and construction requirements15.
Can you live in an RV or tiny home on your land in Union County?
We could not confirm a Union County rule allowing or prohibiting long-term RV, temporary-camping, tiny-home or manufactured-home occupancy on a single private parcel outside a regulated park, so ask the Union County Judge's office before buying land for that use18. Arkansas does answer the park question: a fee-based parcel with 3 or more spaces for RVs, tiny houses on wheels or mobile homes is treated as a regulated park, and Department of Health approval is required before park construction or alteration begins1314. In a regulated RV park, RV occupancy is transient, typically by night or week2829. For the state park rule, a tiny house on wheels is treated as a mobile home when plumbed and inspected under the 2018 Arkansas Plumbing Code and as an RV otherwise30. The mobile-home park rule does not establish permission for one manufactured home on an individual parcel31.
How do you build a home in Union County, step by step?
- Contact the Arkansas State Fire Marshal's Office about Fire Prevention Code compliance before you start, since no local building permit is issued outside El Dorado city limits211.
- If you are building it yourself, confirm you qualify for Arkansas's owner-builder exemption from residential-contractor licensing, which applies as long as you build no more than one residence per calendar year910.
- Arrange water: public and semi-public wells need written Arkansas Department of Health approval before construction, while the cited rules do not state that an ordinary private domestic well needs separate department construction approval; contracted well and pump work still must be performed by or under a properly licensed Arkansas water-well contractor15.
- If you will use a septic system, get Arkansas Department of Health onsite-wastewater permit approval, in cooperation with the Union County Health Unit, before building the home and the system, and obtain the operation permit before using it8, especially if the lot is part of a platted subdivision2322.
- If your driveway will connect to a state highway rather than a county road, get an Arkansas Department of Transportation access driveway permit before starting work32.
- Check with the Union County Judge's office about any county zoning, setback or lot-size ordinance, which we could not confirm, and inside El Dorado apply for the city building permit183.
What should you check before buying land in Union County?
Union County is heavily wooded, at 90.2% forest cover, and nearly all gentle terrain, with 96.3% of land at 15% slope or less, which is good for building sites but means clearing costs on a wooded lot3334. Soils are a real constraint for septic: only about 3.5% of the county's soils have no severe limitations for a conventional drain field, so budget for a percolation test and likely an engineered system before you count on standard septic35. Annual precipitation runs high at 55.1 inches, and the county still sees severe drought in about 17.1% of years, both worth weighing for a well or pond3637. About 5.4% of the county is federal land, and population density is low at 36 people per square mile, with the nearest city of 100,000 or more about 87 miles away383940. Farmland runs about $2,912 an acre, the typical home value is $127,395, and the effective property tax rate is a low 0.6%, for a median tax bill around $661 a year41424344. A typical home insurance premium runs about $1,757 a year45. Before you close, ask the Union County Judge's office whether any ordinance touches your parcel and have the Union County Health Unit review septic feasibility1825. For a private domestic well, choose a properly licensed Arkansas water-well contractor and evaluate yield and siting even though the cited state rules do not state that a separate Department of Health construction approval is required15.
Watch-outs
- Whether Union County has adopted countywide zoning was not confirmed by any official source reviewed; the county's office directory lists no planning or zoning department, which is not the same as a located ordinance6.
- Minimum lot size, setbacks, and building height for unincorporated Union County were not found in any official source; ask the County Judge's office before assuming none exist18.
- Public and semi-public wells need written Arkansas Department of Health approval before construction, but the cited rules do not state that an ordinary private domestic well needs separate department construction approval; state construction and contractor-licensing requirements still apply15.
Sources
- Go El Dorado - Codes, Permits & Ordinances (2026 county census)
- Codes, Permits & Ordinances - El Dorado, Arkansas, quoted and re-checked
- Codes, Permits & Ordinances, quoted and re-checked
- Local Government - El Dorado, Arkansas, quoted and re-checked
- codeofarrules.arkansas.gov, quoted and re-checked
- Union County Arkansas - Official Site (2026 county census)
- Arkansas Department of Health - Onsite Wastewater (2026 county census)
- 14 CAR § 21-301. Generally, quoted and re-checked
- Arkansas Residential Contractors Licensing Law (2026 county census)
- Arkansas Residential Contractors Licensing Law, quoted and re-checked
- 2021 Arkansas Fire Prevention Code (Arkansas statewide rule), quoted and re-checked
- 17 CAR § 210-602. Construction and exemptions, quoted and re-checked
- 20 CAR § 138-102. Compliance, quoted and re-checked
- 20 CAR § 138-101. Definitions, quoted and re-checked
- Title 17, Arkansas Water Well Construction Rules, quoted and re-checked
- Codes, Permits & Ordinances, quoted and re-checked
- Codes, Permits & Ordinances, quoted and re-checked
- Union County Judge (unioncountyar.com)
- Union County Highway Department (unioncountyar.com)
- House Bill 2452 — County planning boards and zoning boards of adjustment (Arkansas statewide rule), quoted and re-checked
- codeofarrules.arkansas.gov (Arkansas statewide rule), quoted and re-checked
- 14 CAR § 21-405. Subdivisions, quoted and re-checked
- Arkansas Department of Health, Onsite Wastewater Program (healthy.arkansas.gov)
- 14 CAR § 21-303. Permit Procedure, quoted and re-checked
- Union County Health Unit (unioncountyar.com)
- codeofarrules.arkansas.gov (Arkansas statewide rule), quoted and re-checked
- 17 CAR § 11-607. Public and semi-public wells, quoted and re-checked
- codeofarrules.arkansas.gov, quoted and re-checked
- codeofarrules.arkansas.gov, quoted and re-checked
- 20 CAR § 138-101. Definitions, quoted and re-checked
- codeofarrules.arkansas.gov, quoted and re-checked
- Regulations: Rules for Access Driveways to State Highways (Arkansas statewide rule), quoted and re-checked
- Wooded share of land: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- 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
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Federal land share: Bolthole Index county data
- Population density: Bolthole Index county data
- Straight-line distance from the county center to the nearest city of 100,000+ people: Bolthole Index county data
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Typical home insurance premium: 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.