An official website of the State of Oregon
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An official website of the State of Oregon »
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Rain and melting snow wash dirt and chemicals off impervious surfaces, such as roads and parking lots, into streams and lakes. Impervious surfaces prevent rain and snow-melt from infiltrating into the ground, resulting in stormwater runoff that flows more quickly into waterways. Pollutants and increased flow can impair water quality and increase erosion, harming aquatic ecosystems.
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