Pollutants accumulate on impervious surfaces between rainfall events. Frequent, small rains wash pollutants into streams, rivers, and lakes. These pollutants negatively affect water quality.
As communities grow, impervious areas increase. Larger amounts of impervious surfaces cause the volume and rate of storm water runoff to increase. This can result in flooding, stream channel degradation, and increased water pollution in our surface waters.
Storm Water Pollutants Include:
Bacteria from pet waste
Illegally dumped pollutants
Illicit connections to storm sewers
Oil and grease from car leaks, gas stations, and industrial areas
Pesticides and nutrients from lawns, parks, and roadsides
Salt and sand from snow and ice control applications
Sediment from construction sites
Thermal effects from sun-heated impervious surfaces
Trash, such as cigarette butts, paper wrappers, and plastic bottles