REGULATIONS State-specific

Wisconsin Plumbing Code & Permit Rules

Wisconsin Comm 82 Plumbing Code (Current)

Data sources: State plumbing boards, ICC, IAPMO, EPA Last verified: 2026-03-16

State-specific
Plumbing Code
Required
Annual Backflow Test
No
Homeowner DIY
Yes
Water Heater Permit

Plumbing Code

Wisconsin follows the Wisconsin Comm 82 Plumbing Code (Current edition).

Independent state code; UPC-influenced

Wisconsin maintains its own plumbing code rather than adopting IPC or UPC directly. Contact your local building department for specific requirements.

Backflow Prevention Testing

Annual testing is required in Wisconsin for testable backflow prevention assemblies (RPZ, DCVA, PVB).

  • Residential: Yes — required for homes with irrigation systems or other cross-connections
  • Who can test: Certified tester
  • Enforcement: Local water utility

Water Heater Installation

A permit is required to replace or install a water heater in Wisconsin.

  • Licensed plumber required: Yes
  • Homeowner can DIY: No — licensed plumber required

Universal requirements (all states):

  • Temperature & Pressure Relief (TPR) valve must be installed
  • Discharge pipe from TPR must terminate safely
  • Gas water heaters: proper venting required
  • Minimum 18" clearance from floor for gas heaters in garages
  • Expansion tank often required when backflow preventer is installed on main supply

Homeowner DIY Plumbing Rights

Wisconsin requires a licensed plumber for plumbing work. Homeowner DIY is generally not permitted.

Licensed plumber required

Water Conservation Requirements

Wisconsin follows federal water conservation minimums (no additional state mandates).

Federal minimums apply

Lead Service Line Replacement

Under the revised EPA Lead and Copper Rule (2021), Wisconsin is required to inventory lead service lines and develop replacement plans.

Following EPA Lead and Copper Rule 2021

Important Disclaimer

This information is provided as a general overview. Plumbing codes and regulations can vary significantly between municipalities within Wisconsin. Always check with your local building department before starting any plumbing work. Local codes override state minimums — your city or county may have stricter requirements.

Sources

  • State plumbing boards and licensing agencies
  • International Code Council (ICC) — IPC adoption map
  • International Association of Plumbing and Mechanical Officials (IAPMO) — UPC adoption
  • EPA Safe Drinking Water Act — Cross-Connection Control Program
  • State building departments
Home → Regulations → Wisconsin