| Requirement Level | Who Pays | Result Validity | Authority |
|---|---|---|---|
| County-level mandates | Negotiated | Varies by county (typically 90 days) | MI EGLE Water Resources Division |
Overview: Michigan Well Water Rules
Michigan does not have a statewide law requiring well water testing at point of sale, but individual county health departments have enacted their own ordinances. Oakland County, Washtenaw County, and Ingham County are among those with mandatory testing requirements. Always verify with your county before assuming no requirement applies.
What Must Be Tested in Michigan
| Parameter | Standard | Requirement |
|---|---|---|
| Coliform bacteria | Absent | Typical county minimum |
| Nitrates | ≤10 mg/L | Typical county minimum |
| Additional parameters | Varies by county | Confirm with local health dept |
Finding a State-Certified Lab in Michigan
Michigan requires testing through a state-certified laboratory. To find a lab:
- Contact your county health department — many maintain a local lab referral list
- Search the MI EGLE Water Resources Division website for a list of certified labs
- Use our national certified lab finder guide for resources
Do not use a DIY kit or an uncertified online mail-in service for loan transactions or state-required testing. Results must come from a MDHHS-certified laboratory.
Federal Loan Requirements in Michigan
Regardless of Michigan's state requirements, federal loan programs impose their own standards:
- VA loans: Always require a water quality test, results valid 90 days. VA guide →
- FHA loans: Require testing when proximity triggers are met (well within 100 ft of septic, etc.). FHA guide →
- USDA loans: Always require testing, results valid 180 days. USDA guide →
I’m buying with cash in Michigan — do I need a well water test?
For a cash purchase in Michigan, there is no legal requirement in most situations. However, conducting your own water quality test is strongly recommended. A basic certified lab test costs $100–$200 and is far less expensive than discovering contamination after closing.
How much does well water testing cost in Michigan?
A basic certified lab panel in Michigan (coliform + nitrates + pH) typically costs $75–$150. A comprehensive panel meeting loan requirements runs $150–$350. Some county health departments offer subsidized testing programs — call your county health office to check. See our full cost guide for more detail.
← Back to all state requirements
Disclaimer State requirements change. Always verify current rules with your MI EGLE Water Resources Division and your transaction’s real estate attorney before relying on this information.