Department of Ecology
One of the main pollution sources from urban and suburban communities is stormwater. Stormwater is rain and snow melt that flows over rooftops, streets, landscaping, and parking lots that can pick up and carry pollution into nearby waterways. Stormwater is not always treated even when it flows into street drains and can be a leading threat to water quality. Due to the significant rain and snow across the state, Washington has become a leader in stormwater management.
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