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Bay City · Bay County · Michigan

Septic in Bay City, MI

Bay City has 32,445 residents and 90.9 percent of homes built before 1980. Bay County publishes a public septic map and requires a 5-foot trench for evaluations in frozen soil.

Residents
32,445
Homes built before 1980
90.9%
Median home value
$89,900

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

Written by the SepticMatch editorial teamLast reviewed Oct 19, 2026

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Bay County sets the septic rules

Septic permits, sale inspections and installer rules are set by the county health department, not by the city. A public septic map, and a 5-foot trench in frozen soil.

Who permits septic systems
Bay County Health Department, Environmental Health Division
Inspection at sale
No rule found in the county's published code
Permit steps
Application processed within 21 calendar days; permits do not transfer to new owners; appeals to the Health Officer within 10 days of issuance; a public online septic map exists.

See the Bay County septic rules

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