What is stormwater?
Stormwater runoff occurs when rain or melted snow flows over the ground. As stormwater runs over streets, sidewalks, driveways or yards, it can pick up pollution, dirt, and chemicals, especially fertilizers and pesticides from lawns.
Polluted stormwater can then flow into a storm sewer system or directly into a lake, stream, river, or coastal body of water. Also, any toxic chemicals or hazardous materials that can be carried by water can wash into storm sewer systems or be deliberately dumped into storm drains. Pollution that flows into a storm sewer system can flow into and pollute sources of water for drinking, swimming, and fishing.
A sanitary sewer overflow is a discharge of raw sewage from a municipal sanitary sewer system. Sanitary sewer overflows can release untreated sewage into basements, streets, or streams before they can reach a treatment facility.
Because sanitary sewer overflows contain raw sewage, they can carry bacteria, viruses, parasites, intestinal worms, and molds. The diseases they may cause range from mild stomach cramps to life-threatening illnesses such as cholera, infectious hepatitis, and severe gastroenteritis.
This description is based on the information found in the Web links listed with this topic.
Web Links from MedlinePlus (National Library of Medicine)
E. Coli Infections
After the Storm (Environmental Protection Agency) (PDF — 422.02 KB)
Drinking Water Contaminants - Standards and Regulations (Environmental Protection Agency)
Managing Stormwater Runoff to Prevent Contamination of Drinking Water (Environmental Protection Agency) (PDF — 417.62 MB)
National Pollutant Discharge Elimination System (NPDES) (Environmental Protection Agency)
Protect Sources of Drinking Water (Environmental Protection Agency)
Runoff (Surface Water Runoff) (US Geological Survey)
Sanitary Sewer Overflows and Peak Flows Fact Sheets and Outreach Materials (Environmental Protection Agency)
Stormwater Training. (County of San Diego) (PDF — 66.29 KB)
Why Control Sanitary Sewer Overflows? (Environmental Protection Agency) (PDF — 126.14 KB)
Chemicals in Stormwater
Are these chemicals in MY community?
Bisphenol A (BPA)
Perchloroethylene (PCE, PERC)
Persistent Organic Pollutants (POPs)
Polybrominated Diphenyl Ethers (PBDEs)
Polychlorinated Biphenyls (PCBs)
Polyvinyl Chloride (PVC)
Volatile Organic Compounds (VOCs)
Last Updated: August 16, 2016