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Port Huron · St. Clair County · Michigan

Septic in Port Huron, MI

In Port Huron, septic installation is barred from December 1 to March 1 without prior approval from St. Clair County. The county also runs a 24-hour anonymous line for reporting failing systems.

Residents
28,724
Homes built before 1980
79.2%
Median home value
$136,000

Census figures: ACS 2023 five-year estimates (B01003, B25034, B25077).

Written by the SepticMatch editorial teamLast reviewed Oct 19, 2026

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St. Clair County sets the septic rules

Septic permits, sale inspections and installer rules are set by the county health department, not by the city. Clay soil, a December 1 to March 1 installation ban, and 30,000 septic homes.

Who permits septic systems
St. Clair County Health Department, Environmental Health Division, 220 Fort Street, Port Huron
Inspection at sale
No rule found in the county's published code
Permit steps
Sewage permit before installing or repairing; application with plot plan, tax ID, legal description and fee; then the area sanitarian does soil borings (backhoe usually needed because of clay).

See the St. Clair County septic rules

Ready when you are.Describe the problem and one septic company that works St. Clair County will call you back.
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