Well Water Testing Requirements in Tennessee (TN)
Tennessee does not require ongoing private well testing. New wells must be tested for bacteria. The TN Department of Environment and Conservation manages well permits. Karst geology in middle Tennessee creates groundwater vulnerability and the potential for rapid contamination. The state has approximately 300,000 private wells.
Required Contaminant Tests in Tennessee
Tennessee requires testing for the following 1 contaminants for new wells:
Common Contaminants in Tennessee Well Water
Based on geological conditions, land use patterns, and historical testing data, these contaminants are commonly found in Tennessee private wells. Even if not required by law, testing for these contaminants is recommended.
Testing Requirements by City in Tennessee
Local testing requirements may vary from state-level regulations. Some counties and municipalities have stricter rules than the state minimum. Below are details for major cities in Tennessee.
| City | Testing Required | Notes |
|---|---|---|
| Nashville | No | Davidson County; karst geology |
| Memphis | No | Shelby County; Memphis Sand aquifer |
| Knoxville | No | Knox County; Valley and Ridge |
| Chattanooga | No | Hamilton County; karst; caves |
| Murfreesboro | No | Rutherford County; central basin |
Testing Recommendations for Tennessee Well Owners
- Even though your state does not require testing, the EPA recommends testing private well water annually for bacteria and nitrate.
- Radon in water is a concern in your state. Consider testing for radon, especially in bedrock wells.
Understanding Tennessee's Well Water Regulations
Testing Frequency
Tennessee does not require ongoing testing of private well water. However, the EPA recommends all private well owners test annually for bacteria and nitrate, regardless of state requirements. Proactive testing is the only way to ensure your well water is safe.
New Well Requirements
Tennessee requires testing when a new well is constructed or an existing well is significantly modified. The required tests include bacteria (coliform/e. coli), and the well must pass these tests before being put into service for drinking water. Well construction must comply with state standards and a permit is required before drilling.
State Laboratory and Testing Resources
Tennessee operates a state laboratory or participates in a state lab network that provides water testing services, often at subsidized rates below commercial laboratory prices. Contact your state health department or environmental agency for current pricing and sample submission procedures. Many county health departments also offer basic bacteria testing, sometimes at no cost. The average cost for a comprehensive well water test in Tennessee is approximately $125, though a basic bacteria and nitrate screen may cost significantly less.
How Tennessee Compares
Tennessee has a minimal level of well water testing regulation. Below are other states with similar regulatory approaches.
| State | Testing Required | Test at Sale | Required Tests | Avg. Cost |
|---|---|---|---|---|
| Tennessee (TN) | No | No | 1 | $125 |
| Alabama (AL) | No | No | 1 | $150 |
| Alaska (AK) | No | No | 2 | $200 |
| Arizona (AZ) | No | No | 2 | $175 |
| Arkansas (AR) | No | No | 1 | $125 |
| California (CA) | No | No | 2 | $250 |
Check Other States
Use our well water testing lookup tool to check requirements for any state, or browse all 50 states ranked by testing strictness. If you are moving to or buying property in Tennessee, understanding the testing requirements is an important part of your due diligence.