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Owosso · Shiawassee County · Michigan

Septic in Owosso, MI

Owosso homes with septic fall under a Shiawassee County ordinance that requires a county-certified evaluation before a sale, and servicing of a tank not pumped in two years.

Residents
14,658
Homes built before 1980
85.8%
Median home value
$121,500

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

Written by the SepticMatch editorial teamLast reviewed Oct 19, 2026

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Shiawassee County sets the septic rules

Septic permits, sale inspections and installer rules are set by the county health department, not by the city. A 2001 sale ordinance that also checks when the tank was last pumped.

Who permits septic systems
Shiawassee County Health Department, Environmental Health Division
Inspection at sale
Required
Permit steps
Point of Sale page offers buyer and seller information, a request form, an inspector application and the list of certified inspectors; online fee payment.

See the Shiawassee County septic rules

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