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Tumwater staff outline how city will meet NPDES stormwater permit requirements
Summary
Tumwater water-resources staff briefed the Public Works Committee on NPDES permit obligations, describing education, mapping, IDDE, inspections and retrofit projects (including a Beehive retrofit) that collectively exceed the city’s 4.2 equivalent-acre requirement and support TMDL work on the Deschutes River and Budd Inlet.
David, a water-resources staffer, told the committee that the city’s National Pollutant Discharge Elimination System (NPDES) permit, administered under the Clean Water Act by the Washington Department of Ecology, requires a citywide program of planning, mapping, monitoring and enforcement to protect state waters. The current permit runs from Aug. 1, 2024, to July 31, 2029.
David said the permit’s requirements reach across departments and include stormwater planning (tree canopy and site-review goals), illicit discharge detection and elimination (IDDE) and stormwater pollution prevention plans (SWPPPs) at facilities that store chemicals or equipment. "It is administered through the Department of Ecology through, through the Clean Water Act," he said, describing ecology’s role in the program.
Staff highlighted public-education and stewardship efforts including a regional stream team, Habitat at Home…
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