| Benchmark Levels | Level of Concern for Aquatic Life | Impacts on Aquatic Life |
|---|---|---|
| Below EPA risk-based guidelines and state water quality standards for protection of aquatic life. | Low | Below levels that pose problems for aquatic life. |
| Above EPA risk-based guidelines or state water quality standards for chronic exposure. | Moderate | Levels that might impact the health, growth or reproductive activity of aquatic life if exposed for an extended period of time. |
| Above EPA risk-based guidelines or state water quality standards for acute exposure or failed a toxicity test. | High | Elevated potential for mortality among aquatic life |