| Requirement Level | Who Pays | Result Validity | Authority |
|---|---|---|---|
| No state mandate; loan-required | Negotiated | Per loan type | Tennessee Department of Environment and Conservation (TDEC) |
Overview: Tennessee Well Water Rules
Tennessee's geology ranges from limestone karst in middle Tennessee to sandstone and shale in the east, creating varying groundwater quality across the state. The state has no point-of-sale testing mandate, though federal loan requirements apply to financed transactions. TDEC recommends annual bacteria and nitrate testing for all private wells.
What Must Be Tested in Tennessee
| Parameter | Standard | Requirement |
|---|---|---|
| Coliform bacteria | Absent | Loan-required; annual recommended |
| Nitrate | ≤10 mg/L | Loan-required |
| pH | 6.5–8.5 | Recommended |
| Radon | Per EPA advisory | Consider in eastern Tennessee |
Finding a State-Certified Lab in Tennessee
Tennessee 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 Tennessee Department of Environment and Conservation (TDEC) 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 TDEC-certified laboratory.
Federal Loan Requirements in Tennessee
Regardless of Tennessee'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 Tennessee — do I need a well water test?
For a cash purchase in Tennessee, 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 Tennessee?
A basic certified lab panel in Tennessee (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 Tennessee Department of Environment and Conservation (TDEC) and your transaction’s real estate attorney before relying on this information.