Well Water Testing Requirements in Maryland (MD)
Maryland does not have a statewide ongoing testing requirement, but some counties require testing at property sale. New wells must be tested for bacteria and nitrate. County health departments are the primary regulators. The Eastern Shore has significant agricultural nitrate concerns. The state has approximately 350,000 private wells.
Required Contaminant Tests in Maryland
Maryland requires testing for the following 2 contaminants for new wells:
Common Contaminants in Maryland Well Water
Based on geological conditions, land use patterns, and historical testing data, these contaminants are commonly found in Maryland private wells. Even if not required by law, testing for these contaminants is recommended.
Testing Requirements by City in Maryland
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 Maryland.
| City | Testing Required | Notes |
|---|---|---|
| Baltimore | No | Baltimore County has testing recommendations |
| Annapolis | No | Anne Arundel County; Chesapeake Bay area |
| Frederick | No | Frederick County; limestone geology |
| Hagerstown | No | Washington County; Great Valley aquifer |
| Salisbury | No | Eastern Shore; agricultural nitrate |
Testing Recommendations for Maryland 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.
- PFAS (forever chemicals) have been detected in your state. Consider testing for PFAS compounds.
- Nitrate contamination is common in your area. Test annually, especially if near agricultural land.
Understanding Maryland's Well Water Regulations
Testing Frequency
Testing requirements in Maryland vary by county and municipality. Some local jurisdictions have enacted stricter testing requirements than the state minimum. Contact your county health department to determine the specific requirements in your area.
New Well Requirements
Maryland requires testing when a new well is constructed or an existing well is significantly modified. The required tests include bacteria (coliform/e. coli), nitrate, 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
Maryland 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 Maryland is approximately $200, though a basic bacteria and nitrate screen may cost significantly less.
How Maryland Compares
Maryland 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 |
|---|---|---|---|---|
| Maryland (MD) | No | No | 2 | $200 |
| 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 Maryland, understanding the testing requirements is an important part of your due diligence.