Sourced from Michigan Lakes and Streams Association, county health department documentation, and EGLE Onsite Wastewater Program guidance — last checked August 2026.
The Records Problem
This is the defining issue for Michigan septic transactions, and it’s more serious here than in states with a statewide code.
There’s no statewide database of septic systems. There’s never been a statewide inspection requirement. Some older rural systems were installed without a permit at all, meaning no record exists anywhere.
So a buyer may be purchasing a system that nobody has evaluated in decades — or ever. With replacement costs running past $20,000, that’s a substantial unknown to carry into a closing.
Check for a Time of Sale Ordinance
First question: does the county or township have one?
Time of Sale or Transfer ordinances — TOST, also called Point of Sale — require well and septic inspection before a property sells. They’re adopted locally, and more Michigan communities have been adopting them over time.
Ask the local health department about the specific address, since some ordinances are township-level rather than county-wide. And check close to the transaction, because the answer may have changed since someone last looked.
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What Does Your Michigan County Require?
Michigan is the only state in the country without a statewide septic code. Instead, 45 local health departments write and enforce their own sanitary codes across 83 counties. That means there is genuinely no statewide answer to most septic questions here — your county’s code is the rule, and it can differ sharply from the county next door.
Directional guidance only. Michigan’s 45 local health departments each adopt and enforce their own sanitary code. EGLE’s Onsite Wastewater Program provides guidance and oversight but generally does not override local health department authority.
What Buyers Should Ask
What records exist for this property? Permit, as-built drawing, prior evaluations. If the health department has nothing, that’s important information rather than a formality.
How old is the system, and what type? If nobody knows, that itself tells you something.
Where exactly is it? Tank, drainfield, and any reserve area. You need to know before you plan a shed, a pool or a driveway.
Has anything been built over it? Structures over a drainfield or reserve area create real problems later.
What would replacement cost here? On heavy clay in Southeast Michigan or thin soil in the UP, a conventional field may no longer be permittable. Ask the health department what the site would support today — not what’s currently in the ground.
Would the county even approve a replacement? The uncomfortable question, and worth asking on an older rural lot.
Get an Inspection Even Where None Is Required
In a state with no inspection history, a voluntary evaluation buys you information that simply doesn’t exist otherwise. Relative to the cost of a failed system, it’s inexpensive.
If the property is near water — and a great deal of Michigan property is — it’s worth knowing the system’s condition for reasons beyond your own wallet. Under the proposed SB 771, systems over 20 years old within 500 feet of surface water would be first in line for mandatory evaluation.
For Sellers
Michigan’s records gap cuts both ways. A buyer who can’t verify anything will price that uncertainty into their offer, or walk.
Pull whatever the health department has for the property, well before listing.
Pump the tank and keep the receipt.
Gather your own records into one folder — permits, pumping receipts, any repair invoices.
Consider a pre-listing inspection, particularly on an older system. Knowing about a problem in advance means you control the timing and the contractor. Discovering it during a buyer’s due diligence means you don’t.
Find out whether your county has a TOST ordinance before you list, not two weeks before closing.
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Frequently Asked Questions
Does Michigan require a septic inspection when buying a home?
Not statewide. Some counties and townships have Time of Sale ordinances requiring it. Ask the local health department about the specific address.
What should Michigan buyers ask about septic?
What records exist, how old the system is and what type, where exactly it is located, whether anything has been built over it, and what a replacement would cost under current county rules.
Why is the records question worse in Michigan?
There is no statewide database, no historical inspection requirement, and some older rural systems were installed without a permit at all — so a buyer may be purchasing a system nobody has ever evaluated.
How should Michigan sellers prepare?
Pull whatever records the health department holds, pump the tank and keep the receipt, gather your own documentation, check whether the county has a TOST ordinance, and consider a pre-listing inspection on an older system.