The following table lists some of the prohibited and allowed discharges to the storm drain system:
Prohibited Discharges: |
Allowed Discharges: |
Industrial process water |
Water utility line flushing |
Commercial car wash wastewater |
Runoff from firefighting |
Sanitary sewer flows |
Landscape irrigation |
Wash-down of loading areas |
Uncontaminated ground water infiltration |
Wastewater treatment plant effluent |
Discharges from potable water sources |
Dumping of liquid waste |
Dechlorinated pool water |
Chlorinated pool water |
Street wash water from cleaning/maintenance (excluding street sweeper water waste) |
Water softener brine backwash |
Residential car washing |
Used oil |
Air conditioning condensation |
The following table lists some of the physical indicators that may signal an illicit discharge; physical indicators are those that can be observed or sensed during dry weather field screening and routine inspections:
| Unusual color or cloudiness |
| Strong pungent or musty odor |
| Floating debris |
| Surface scum or foam |
| Oil sheen |
| Algae |
| Dead vegetation or inhibited growth |
| Dead animals |
| Stains on channel bottom or sides |
| Pipe corrosion |