Zoning, building permits and septic rules in Town of Somerset, Wisconsin

Town of Somerset’s own rules

• Building permitRequired

  Owner work on property inside the Town of Somerset (St. Croix County, WI) that changes the property by a real value of $2,000 or more

  • Permit is issued through the town's building inspector, All-Croix Inspections LLC.
  • The town page lists new homes, storage sheds, alterations, porches, decks, garages, electrical, commercial/industrial, additions, pools, moving a house, repairs and fireplaces as permit types.
  • The town page says to contact the building inspector before beginning a project to inquire about required permits.
  • Under the county sanitary program, a sanitary permit must be obtained before a building permit is issued by the local municipality (see septic-permit claim).

  real value of change requiring permit: >= 2000 USD

  “the town of somerset requires owners to obtain a permit prior to changing almost any part of a property if the change has a real value of $2,000 or more.”

• Permit feesVariable (with conditions)

  Building permit fees for work inside the Town of Somerset

  • Fees are set by the building inspector's agreement for services schedule, referenced as the 2026-2028 schedule; the schedule itself was not opened.

  “permit fees vary. please refer to the 2026-2028 building inspector's agreement for services schedule or contact the building inspector.”

• Permit processPartial

  Building permit application process inside the Town of Somerset

  • Application form is hosted by the building inspector at allcroix.com; the page gives no review timeline or steps.
  • Contact the building inspector before starting a project to confirm required permits.
  • A county sanitary permit must come before the building permit where applicable.

  “For a building permit application form please go to:”

Rules another office applies inside Town of Somerset

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

• Who permits septicMixed (with conditions)

  Private onsite wastewater (septic/POWTS) systems on land inside the Town of Somerset (unincorporated area of St. Croix County, WI); the county program applies inside the town

  • A state sanitary permit is required for new POWTS installation; the county issues permits for new installations and for repair, reconnection, or rejuvenation.
  • The county's Sanitary Program page describes county sanitary code and records; the county sanitary code (Chapter 12) was referenced in search results but not opened.

  “We issue permits for new septic system installations”

• Septic permitRequired

  Installation, repair, reconnection or rejuvenation of septic (POWTS) systems and non-plumbing sanitation (privy, composting toilet) on land inside the Town of Somerset

  • Sanitary permit may only be submitted by a licensed plumber.
  • A sanitary permit is required before obtaining a building permit from the local municipality.
  • The state sanitary permit covers new POWTS installation; the county sanitary permit covers repair, reconnection, rejuvenation and non-plumbing sanitation.

  “a state sanitary permit is required for the installation of a private on-site wastewater treatment system (powts).”

• Septic inspectionRequired

  Private onsite wastewater treatment systems on land inside the Town of Somerset (maintenance inspection) and work that needs a sanitary permit

  • Systems must be serviced or inspected at least once every three years unless a management plan says otherwise (state rule SPS 383, as stated on the county page).
  • Inspections may be done by a master plumber, POWTS inspector, septage servicing operator, or POWTS maintainer.
  • Staff conduct at least one inspection for all work requiring a sanitary permit.

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

  “this notice complies with wi administrative code sps 383, which mandates that private onsite wastewater treatment systems be serviced or inspected at least once every three years unless otherwise specified in a management plan.”

• Off-grid sanitationLimited

  Non-plumbing sanitation (privy, composting toilet) on land inside the Town of Somerset (unincorporated area of St. Croix County, WI)

  • Allowed only with a county sanitary permit, which must be submitted by a licensed plumber.
  • Permit is required before a building permit from the local municipality.

  “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 Somerset or St. Croix County directly.

• Owner-builder exemption — Owner-builders constructing their own home inside the Town of Somerset (St. Croix County, WI)
• Building code adopted — New construction and alterations inside the Town of Somerset (St. Croix County, WI)
• Inspections — Inspections of permitted construction inside the Town of Somerset (St. Croix County, WI)
• Certificate of occupancy — Occupancy of new or altered buildings inside the Town of Somerset (St. Croix County, WI)
• Local zoning — Land inside the Town of Somerset (St. Croix County, WI) limits: whether the town administers its own zoning ordinance

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.