Discharge Monitoring Reports (DMR's) and water pollution historical documents

This archive documents a long history of water pollution discharged from Seattle-Tacoma (Sea-Tac) Airport into nearby waterways, dating back to 1948. It includes Discharge Monitoring Reports filed by the Port of Seattle showing high concentrations of glycol and other chemicals flowing into local stormwater systems and ultimately Puget Sound, as well as historical letters from the 1950s describing fish kills in Miller Creek and Des Moines Creek caused by airport runoff. The records reveal decades of regulatory correspondence between the Port of Seattle and Washington State pollution authorities over inadequate waste disposal practices.

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This page provides links to Discharge Monitoring Reports (DMRs) filed by the Port of Seattle under its NPDES permit, documenting glycol concentrations in effluent discharged from Sea-Tac Airport outfalls into stormwater systems that flow into Puget Sound. It also catalogs historical water pollution documents from 1948–1957, including correspondence between the Washington State Pollution Control Commission, the Port of Seattle, and other parties regarding oil, grease, and airplane wash water discharges from Sea-Tac Airport causing fish kills in Miller Creek and Des Moines Creek. The documents reveal a decades-long pattern of inadequate pollution control measures and regulatory responses.

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