Well Water Testing Requirements in Hawaii (HI)
Hawaii does not require ongoing private well testing. New wells must be tested for bacteria and nitrate. The volcanic geology creates unique water quality conditions. Most residents are on public water systems. The Commission on Water Resource Management oversees well permits. The state has approximately 15,000 private wells.
Required Contaminant Tests in Hawaii
Hawaii requires testing for the following 2 contaminants for new wells:
Common Contaminants in Hawaii Well Water
Based on geological conditions, land use patterns, and historical testing data, these contaminants are commonly found in Hawaii private wells. Even if not required by law, testing for these contaminants is recommended.
Testing Requirements by City in Hawaii
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 Hawaii.
| City | Testing Required | Notes |
|---|---|---|
| Honolulu | No | Oahu; most residents on public water |
| Hilo | No | Big Island; volcanic geology |
| Kailua-Kona | No | West Hawaii; limited freshwater |
| Kahului | No | Maui; agricultural contamination risk |
| Lihue | No | Kauai; heavy rainfall area |
Testing Recommendations for Hawaii Well Owners
- Even though your state does not require testing, the EPA recommends testing private well water annually for bacteria and nitrate.
- Nitrate contamination is common in your area. Test annually, especially if near agricultural land.
Understanding Hawaii's Well Water Regulations
Testing Frequency
Hawaii 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
Hawaii 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
Hawaii 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 Hawaii is approximately $250, though a basic bacteria and nitrate screen may cost significantly less.
How Hawaii Compares
Hawaii 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 |
|---|---|---|---|---|
| Hawaii (HI) | No | No | 2 | $250 |
| 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 Hawaii, understanding the testing requirements is an important part of your due diligence.