USGS Washington Water Science Center
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The Washington State Department of Transportation, or WSDOT, monitors the water quality of runoff from state highways and other transportation facilities under their National Pollution Discharge Elimination System (NPDES) permit. The NPDES permit requires WSDOT to make sure that the stormwater meets Clean Water Act and other regulations designed to restore and protect our country's water resources.
To help WSDOT meet new as well as existing NPDES permit requirements and look for ways to improve their performance, the USGS will provide a scientific assessment of the WSDOT stormwater monitoring program.