State plumbing guide · MI
Plumbing in Michigan
Michigan sets a statewide plumbing code and faces two big plumbing issues: very old housing in its older cities, and lead service lines that cities like Detroit are working to replace. Long winters make freeze protection routine.
- Median home built
- 1972
- Built before 1980
- 61%
- Owner-occupied
- 74%
- Winter
- Long, hard freezes
- General statewide rating
- Plumbing code
- IPC
- City guides
- 5
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
Michigan city plumbing guides
How to check a plumber's license in Michigan
Michigan licenses journey plumbers, master plumbers and plumbing contractors through LARA's Bureau of Construction Codes, and a plumbing contractor license requires a licensed master plumber. [1]
Seasonal problems to plan for in Michigan
- Winter
- Long, deep freezes. Frozen and burst pipes, frozen service lines in shallow spots, and sewer backups during thaws.
- Spring and summer
- Heavy storms can flood basements through floor drains; backwater valves and sump pumps matter.
What shapes plumbing in Michigan
Detroit's water department estimates more than 80,000 lead service lines serve homes in the city, mostly single-family homes built before 1945, and is replacing them at no cost to property owners. [3]
Michigan's 2018 Lead and Copper Rule requires community water systems to replace all lead service lines, the full line from the main to the home at the utility's cost, within 20 years (by 2041 unless EGLE approves another schedule). Partial replacements are banned. [4]
Michigan's older housing stock
Statewide, the median home was built in 1972 and 61% of homes predate 1980. Homes like that were usually built with copper supply, early plastic (ABS or PVC) drains, some cast iron. The city guides below show how much that varies within the state.
Which plumbing code applies in Michigan
The Michigan Plumbing Code, administered by the Bureau of Construction Codes, adopts the 2021 International Plumbing Code with Michigan amendments, effective March 12, 2024. [2]Awaiting verification
Regions of Michigan
Southeast Michigan
Detroit: very old housing, lead service lines, Great Lakes water, long winters.
Michigan plumbing questions
Will Detroit replace my lead service line?
DWSD replaces lead service lines at no cost to property owners, neighborhood by neighborhood, and estimates the full program will take about 10 years. Check the city's Lead Service Line Replacement Program page for your area.
Which plumbing code applies in Michigan?
Michigan has a statewide plumbing code, based on the International Plumbing Code with Michigan amendments, administered by the Bureau of Construction Codes.
Sources (5)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- Michigan LARA, Plumbing Examination, Licensing/Registration & Application Information · checked 2026-10-01
- Michigan LARA, Bureau of Construction Codes (confirm against filed rules)
- City of Detroit, DWSD Lead Service Line Replacement Program · checked 2026-10-01
- Michigan EGLE, Lead and Copper Rule · checked 2026-10-01