Stormwater management is how we control the quantity and quality of stormwater through the use of structural controls like pipes, detention basins and catch basins and non-structural controls like public education and monitoring. U.S. Environmental Protection Agency (EPA) studies have demonstrated that stormwater pollution is one of the most significant sources of water pollution today. When it rains or snow melts, the resulting stormwater picks up or dissolves pollutants and washes them into stormwater conveyance systems. Polluted stormwater runoff is often discharged into local rivers and streams without treatment. Common pollutants include oil, grease and metals from cars and roadways; pesticides and fertilizers from lawn maintenance activities; sediment from construction sites; and the improper disposal of litter including cigarette butts, paper wrappers and plastic bottles. Stormwater can impair waterways, degrade animal habitat, pollute drinking water, increase flooding, cause erosion of streambeds or siltation of waterways, and decrease the amount of water recharged to aquifers.