Zoning, building permits and septic rules in Town of Star Prairie, Wisconsin

Town of Star Prairie’s own rules

• Building code adoptedAdopted

  Construction inside the Town of Star Prairie

  • The town's building code is Title 15, Chapter 1 of its code of ordinances; the chapter text was not opened.
  • The town states that Ordinances 2025-001 and 2025-002 amending the building inspection and permit ordinance are not yet in the online Municode version.

  “click here to read town of star prairie's building code: title 15, chapter 1”

• Permit processPartial

  Building permit process inside the Town of Star Prairie

  • The town page gives the inspector's contact details and the code link; the steps, forms and fees are not on the page opened.
  • Septic sanitary permit must come first (county).

  “a sanitary permit is required before obtaining a building permit from your local municipality.”

Rules another office applies inside Town of Star Prairie

Town of Star Prairie does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

• Local zoningPresent (with conditions)

  Land inside the Town of Star Prairie is zoned under St. Croix County Chapter 15 (county-administered, not a town ordinance); this claim aggregates the county rule that applies in the town

  • Rezoning and conditional use permits are handled by the St. Croix County Community Development Department, (715) 386-4680, per the town FAQ.
  • Floodplain, shoreland, and wetland zoning are separate county rules and are not covered by this claim.

  “the town of star prairie is under the jurisdiction of st. croix county for land use & zoning.”

• Zoning districtsPublished (with conditions)

  St. Croix County Chapter 15 district list, which applies to land inside the Town of Star Prairie; parcel-by-parcel district mapping is not verified

  • Districts include AG-1, AG-2, R-1, R-2, R-3, C-1, C-2, C-3, I-1, I-2, NMO and Conservancy.
  • The district-by-parcel map for the town was not opened.

  “15.220 ag-1 agricultural district 15.221 ag-2 agricultural district”

• Minimum lot sizeDistrict specific (with conditions)

  Parcels inside the Town of Star Prairie zoned St. Croix County R-2 residential district (main district; district mapping for each parcel not verified)

  • Lot area minimum is stated as a standard design figure; conservation design lots are not shown (--) in the table.
  • Density is controlled by the county subdivision ordinance referenced in the table.

  lot area (min): >= 1.5 acres (standard design; conservation design not applicable in table)

  “1 lot area (min) 1.5 acres -- 2 density (max) -- see subdivision ordinance”

• SetbacksDistrict specific (with conditions)

  Principal buildings on parcels inside the Town of Star Prairie zoned St. Croix County R-1 district (district mapping for each parcel not verified)

  • Accessory structures have a 5 ft side and rear setback; structures housing animals have a 100 ft setback.
  • Setbacks are minimums.

  street setback (min): >= 50 feet · side setback (min): >= 10 feet (any side; 5 ft for accessory structures) · rear setback (min): >= 25 feet (for principal building; 5 ft for accessory structure)

  “4 street setback (min) 50' 5 side setback (min) 10’ any side 5’ accessory structure,100' structure housing animals 6 rear setback (min) 25’ for principal building 5’ accessory structure, 100' structure housing animals”

• Who permits septicMixed (with conditions)

  Private onsite wastewater (septic) systems on land inside the Town of Star Prairie: the state sets the permit requirement for installation and St. Croix County issues the sanitary permits

  • The state sanitary permit covers installation of a POWTS; the county sanitary permit covers repair, reconnection, rejuvenation, and non-plumbing sanitation.
  • County Community Development Department manages septic permits and maintenance records.

  “a state sanitary permit is required for the installation of a private on-site wastewater treatment system (powts). a county sanitary permit is required for the repair, reconnection, or rejuvenation of a powts, or the installation of a non-plumbing sanitation (i.e. privy, composting toilet, etc.)”

• Septic permitRequired

  New or repaired septic systems on land inside the Town of Star Prairie

  • A sanitary permit is required before obtaining a building permit from the local municipality.
  • A sanitary permit may only be submitted by a licensed plumber.

  “a sanitary permit is required before obtaining a building permit from your local municipality. a sanitary permit may only be submitted by a licensed plumber.”

• Septic inspectionRequired

  Septic systems on land inside the Town of Star Prairie that need a sanitary permit, plus periodic maintenance inspection of all private onsite systems

  • Staff conduct at least one inspection for work requiring a sanitary permit.
  • Systems must be serviced or inspected at least once every three years unless a management plan says otherwise.

  maintenance inspection interval: <= 3 years (unless otherwise specified in a management plan)

  “staff will conduct at least one inspection for all work requiring a sanitary permit.”

• Off-grid sanitationLimited

  Non-plumbing sanitation (privy, composting toilet) on land inside the Town of Star Prairie

  • A county sanitary permit is required for non-plumbing sanitation systems.

  “a county sanitary permit is required for the repair, reconnection, or rejuvenation of a powts, or the installation of a non-plumbing sanitation (i.e. privy, composting toilet, etc.)”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Star Prairie or St. Croix County directly.

• Owner-builder exemption — Owner-builder exemption for a home inside the Town of Star Prairie
• Inspections — Building inspections inside the Town of Star Prairie
• Certificate of occupancy — Certificate of occupancy for new construction inside the Town of Star Prairie
• Minimum dwelling size — Minimum dwelling size inside the Town of Star Prairie
• Lot coverage — Lot coverage limits inside the Town of Star Prairie

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.