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​Port of Seattle IWTP Effluent Discharge Rate

The airport’s Industrial Wastewater Treatment Plant (IWTP) manages and treats stormwater associated with industrial activities from aircraft fueling and maintenance operations as well as wastewater from other airport related operations such as aircraft deicing. The IWS is permitted to discharge stormwater runoff to the Puget Sound via an outfall shared with the Midway Sewer District and to King County South Treatment Plant via Valley View Sewer District.

Stormwater runoff with low Biochemical Oxygen Demand (BOD) discharges to the Puget Sound under Ecology NPDES Permit No. WA-0024651. Stormwater runoff with high BOD discharges to King County South Treatment Plant for secondary treatment under King County Department of Natural Resources Permit No. 7810-03. Elevated BOD levels are typically associated with stormwater runoff that contains aircraft deicer fluid. 

King County
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Midway
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Note: The discharge flow rates are from the Port of Seattle, Sea-Tac International Airport Wastewater Treatment Plant effluent pump. Discharges are permitted by the NPDES Permit WA-0024651 and King County Waste Discharge Permit 7810-03.

Flow reporting is updated every 5 minutes. Users also may update by refreshing the webpage.