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Stormwater is surface flow water from precipitation that accumulates in and flows through natural and/or man-made conveyance systems during and immediately following a storm event.
As stormwater travels through a conveyance system, such as catch basins, culverts, pipes, and open ditches, it collects and carries significant sources of pollution to streams, rivers and lakes. Common pollutants carried in stormwater include:
Although pollution conveyed by stormwater has historically been overlooked due to the complications associated with identifying and treating the contaminants, it is one of the most significant sources of stream and lake water quality degradation. Lack of proper stormwater management can lead to: