Plumbing Code, Permits, and Administration
Administration and code
Every other domain assumes you can find the rule. This domain tests whether you know who enforces it and how work gets approved.
Who's who. Wisconsin's plumbing code is administered by the Department of Safety and Professional Services (DSPS). The statewide plumbing code adopts the Uniform Plumbing Code with Wisconsin amendments, and it governs plumbing installation, alteration, and repair. The local authority having jurisdiction (AHJ), a city, village, or county, issues permits and performs inspections where the municipality runs a program. DSPS also licenses master plumbers, journeyman plumbers, and apprentices and regulates the trade.
Permits. Obtain the permit before starting work, keep it posted, and leave it up until the final inspection. Permits are typically required for new plumbing, additions, alterations, replacement of underground or concealed piping, and replacement of fixtures or water heaters beyond minor repair. Emergency repairs may begin first, but the AHJ must be notified and a permit application filed promptly.
Inspections. Expect a rough-in inspection after piping is complete and tested but before concealment, and a final inspection after fixtures and trim are installed. Drainage systems are tested with water (commonly a 10-ft head) or air (commonly 10 psi held 15 minutes), so confirm the accepted method with the AHJ. Work concealed without inspection may have to be uncovered at the inspector's direction.
Traps. Items where "the inspector will approve it because it works." Approval follows the adopted code, and the AHJ may require correction. Also watch for unlicensed contracting, working without a permit, and failing to call for inspection, which are the violations the exam likes to test.
Rule of thumb. If a job changes piping, or changes a fixture's location or capacity, assume a permit and an inspection until the AHJ says otherwise.