Authorized non-storm water discharges may include those from which source?

• A. Non-dechlorinated river water
• B. Industrial process water with contaminants
• C. Dechlorinated potable water sources such as Fire Hydrant Flushing
• D. Contaminated wastewater

Answer: (C)

The main idea is that only certain non-stormwater discharges are allowed, specifically those that come from clean, treated sources. Dechlorinated potable water used for activities like fire hydrant flushing is considered safe to discharge because it originates from drinking water and the chlorine has been removed. This reduces the risk to aquatic life and avoids introducing pollutants, so these discharges are authorized as non-stormwater discharges.

Discharges from non-dechlorinated river water could carry chlorine residues or other contaminants, industrial process water with contaminants adds pollutants, and contaminated wastewater clearly brings in pollutants beyond acceptable limits. Those do not fit the criteria for authorized non-stormwater discharges.