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Ann Arbor · Washtenaw County · Michigan

Septic in Ann Arbor, MI

Ann Arbor homes on septic fall under the Washtenaw County time-of-sale regulation, which dates from 2000 and requires a county-certified inspector's evaluation before transfer.

Residents
121,179
Homes built before 1980
64.3%
Median home value
$435,100

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

Written by the SepticMatch editorial teamLast reviewed Oct 19, 2026

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Washtenaw County sets the septic rules

Septic permits, sale inspections and installer rules are set by the county health department, not by the city. A transfer rule dating from 2000.

Who permits septic systems
Washtenaw County Health Department, Environmental Health (septic systems pages)
Inspection at sale
Required
Permit steps
No one may install or replace a system without department approval (regulation Sec. 3:7). Ask the department for the remaining permit steps, fees and isolation distances.

See the Washtenaw County septic rules

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