|1. The addition to a natural body of water of any material which diminishes the optimal economical use of the water body by the population which it serves, and has an adverse effect on the surrounding environment.
2. A substance that deteriorates the aesthetic quality of water, or other materials, but is not harmful to health.
3. The impairment of the quality of water to a degree which does not create an actual hazard to the public health, but which does adversely and unreasonable affect such waters for domestic use.