Lake St. Croix Beach, MN Zoning, Building Permits & Septic

Lake St. Croix Beach, Minnesota adopts and administers its own zoning ordinance, Chapter 157 of the city code¹. Washington County issues septic system permits countywide². We could not confirm the city's building-permit process, so call City Hall at 651-436-7031 before you plan any work³.

At a glance

Zoning: City zoning, Chapter 157, with floodplain and St. Croix River overlays¹
Building permit: Not confirmed for the city; ask City Hall³
Septic permits: Washington County Public Health and Environment²
Minimum home size (R-2): 1,200 square feet of finished, habitable space⁴
Maximum height: 45 feet general cap, with farm-structure exceptions⁵
Lot coverage: 75% maximum, 25% landscaped⁶
RV living: Not confirmed for the city³

Who to call

Building permits

City of Lake St. Croix Beach City Hall

The city's front office; start here for zoning questions, planning commission dates and building-permit instructions

651-436-7031

16455 20th Street South, Lake St. Croix Beach, MN 55043

Septic permits

Washington County Public Health and Environment - Septic (SSTS)

Septic (SSTS) permits and inspections in Washington County

651-430-6655

septic@washingtoncountymn.gov

Washington County Government Center, Room 4600, 14949 62nd Street North, Stillwater, MN 55082

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Lake St. Croix Beach means bringing your own water and power. The kit we’d start with:

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Does Lake St. Croix Beach have zoning?

Yes. The City of Lake St. Croix Beach adopts and administers its own zoning in Chapter 157 of the city code, and it applies to land inside city limits¹. Chapter 157 divides the city into basic districts, including A-1, A-2, R-1, R-2, R-3, R-4 and others, with overlays on top⁷. Two overlays matter most for buyers: a floodplain overlay and a St. Croix River overlay¹.

Washington County's own Development Code applies to unincorporated areas, so it does not set lot rules inside the city; the county leaves land use inside cities to the cities⁸. Ask City Hall which district a given parcel is in, since we could not confirm the zoning map.

What are the lot size, setback and height rules in Lake St. Croix Beach?

Existing lots smaller than 2.5 acres in a residential or agricultural district can still be built on as a single-family home if their area and width are within 60% of the district minimums, all setbacks can be met, and a safe sewage treatment system can be shown⁹. In the R-2 district, the stated intent is single-family homes of at least 1,200 square feet of finished, habitable space⁴.

Along roads the comprehensive plan designates as arterials, principal buildings must sit at least 150 feet from the planned street centerline¹⁰. Buildings, parking and other improvements may cover no more than 75% of a lot⁶. Structures generally may not exceed 45 feet, with exceptions such as barns and silos⁵. Setbacks in the other districts vary, so ask City Hall for the district table.

Do you need a building permit in Lake St. Croix Beach, and who issues it?

We could not confirm the city's building-permit process. Minnesota's State Building Code is the statewide standard for buildings¹¹, and work it covers needs an application to the building official and a permit first¹². Washington County's own guidance sends building-permit questions to the city or township where the property sits, not to the county¹³.

Treat a permit as required until the city says otherwise, and call City Hall³. A subdivided lot must also be approved under the city's Chapter 156¹⁴. Lots in a designated floodplain face Chapter 152 on top of zoning¹⁵.

How do septic permits work in Lake St. Croix Beach?

Washington County Public Health and Environment issues septic system permits countywide, and you need one to install, replace or modify a system¹⁶. The county lists a single-family installation permit at $868¹⁷. Whether the city adds its own septic step inside city limits was not confirmed, so ask City Hall.

The city's code also ties building permits to soils: on a lot without public sanitary sewer, no building permit is issued if the lot lacks the minimum acres of acceptable soils, or lacks enough soil for two complete septic and drainfield systems¹⁸. Sewered lots are not affected by that test.

Can you live in an RV or tiny home in Lake St. Croix Beach?

We could not confirm the city's RV or tiny-home rules. Minnesota says local zoning decides whether a tiny home or accessory dwelling is allowed on a property¹⁹, and tiny houses used as homes must meet the Minnesota Residential Code²⁰. Washington County prohibits using an RV as a dwelling in unincorporated areas²¹, but that rule does not govern land inside city limits. Ask City Hall before parking an RV to live in.

Building a home in Lake St. Croix Beach: the steps, in order

Call City Hall to confirm your zoning district and building-permit steps³.
Check the floodplain and St. Croix River overlays for your lot¹.
If the lot has no public sewer, get a county septic permit and confirm enough acceptable soils¹⁸.
Get the city's building permit, then expect inspections under the State Building Code²².
For a driveway onto a Washington County road, the county requires an access permit before any building permit²³.

What to check before you buy land in Lake St. Croix Beach

Confirm the district, the floodplain status and whether public sewer serves the lot. Washington County's median property tax bill is about $4,012 a year²⁴, and its typical home value is about $451,458²⁵. The county's strict soil rating finds only 6.6% of soils not limited for a conventional drain field, so expect a site evaluation or an engineered system on unsewered lots²⁶. These figures are county-level.

Watch-outs

We could not confirm the city's building code adoption, inspections, certificate of occupancy, fees or owner-builder rules; call City Hall at 651-436-7031³.
Washington County's zoning and RV rules apply to unincorporated land, not inside Lake St. Croix Beach; see the Washington County page for land outside city limits²⁷.
A mapped floodway bars dwellings and enclosed structures²⁸.

Sources

Written October 24, 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.

Unanswered questions are usually a sign that Lake St. Croix Beach publishes no rule on the point, not that none exists. Washington County’s page lists the county offices to call.

Zoning, building permits and septic rules in Lake St. Croix Beach, Minnesota