TagWater Quality(478)
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2026-08-21D.C. Circuit Upholds EPA Designation of PFOA and PFOS as CERCLA Hazardous Substances | Insights | Holland & Knight
Unanimous Decision Upholds EPA Action Creating Superfund Liability for 2 Best-Known PFAS Holland & Knight Alert Matthew Z. Leopold | Dianne R. Phillips | Andy Emerson | Clarissa Howley Mills | Jeff Porter | Rafe Petersen | Evan Neustater Highlights A three-judge panel of the U.S. Court of Appeals for the District of Columbia Circuit -
2026-07-30Hydroworks and Habitat Interpretive Sign — Green/Duwamish River Watershed
An outdoor interpretive sign titled 'Hydroworks and Habitat: Keeping It Clean' with a section labeled 'Water's Coming & Going,' featuring a map of the Green/Duwamish River Watershed. The weathered sign is located along a trail near a wetland or riparian area associated with the Green/Duwamish River system. -
2026-07-15Sea-Tac Communities Plan: Plan Summary Brochure
The Sea-Tac Communities Plan, jointly developed by the Port of Seattle and King County beginning in 1973, outlines strategies to improve compatibility between Sea-Tac International Airport and surrounding neighborhoods, with a focus on aircraft noise remedies, water quality improvements, and land use conversion. The plan identifies specific areas for outright property acquisition, purchase guarantees, and noise insulation programs affecting thousands of homes north and south of the airport. It also establishes policies for drainage management, community development, and long-term airport facility improvements to accommodate projected air traffic growth through 1993. -
2026-07-15
Sea-Tac Communities Plan: Plan Summary Brochure
Plan Summary brochure for the Sea-Tac Communities Plan (STCP), a joint Port Of Seattle and King County Council initiative begun March 1973 to achieve compatibility between Sea-Tac Airport and surrounding communities. Covers water quality programs for Miller Creek and Des Moines Creek basins including holding pond systems sized via Storm Water Management Model (SWMM); airport -
2026-07-15Sea-Tac Communities Plan: Water quality, airport, and community development
The Sea-Tac Communities Plan outlines strategies to improve compatibility between Seattle-Tacoma International Airport and surrounding neighborhoods, focusing on water quality, drainage, and land use. Key programs include public acquisition of noise-impacted residential areas for open space and recreation, conversion of single-family zones to higher-density or commercial uses, and reinforcement of existing neighborhoods through noise remedy and infrastructure improvements. The plan also addresses environmental concerns such as stream protection, holding pond systems for stormwater management, and pollution control near Miller and Des Moines Creeks. -
2026-07-15Sea-Tac Communities Plan: Water quality, airport, and community development
The Sea-Tac Communities Plan outlines strategies to improve compatibility between Seattle-Tacoma International Airport and surrounding neighborhoods, focusing on water quality, drainage, and land use. Key programs include public acquisition of noise-impacted residential areas for open space and recreation, conversion of single-family zones to higher-density or commercial uses, and reinforcement of existing neighborhoods through noise remedy and infrastructure improvements. The plan also addresses environmental concerns such as stream protection, holding pond systems for stormwater management, and pollution control near Miller and Des Moines Creeks. -
Sea-Tac Communities Plan — Sources of Water Quality Problems in Des Moines Creek
A planning map from the Sea-Tac Communities Plan (document number POS 20985, section 6.3.2), sponsored by the Port of Seattle and King County, identifying sources of water quality problems in Des Moines Creek. The map legend distinguishes areas not served by sanitary sewers, areas of possible high chemical application, and unshaded areas along streams, with the Seattle-Tacoma Airport prominently shown. -
2025-06-26Environmental checklist: Seattle-Tacoma International Airport (SEA) Industrial Wastewater Treatment Plant (IWTP) Enhancement Project
The Port of Seattle is proposing upgrades to Seattle-Tacoma International Airport's Industrial Wastewater Treatment Plant (IWTP) to better handle wastewater from aircraft deicing operations, with construction planned from 2026 to 2030. The project involves replacing aging treatment equipment at the existing facility and building a new aerated gravel bed (AGB) treatment system on a 10.6-acre site nearby to process high levels of biochemical oxygen demand (BOD) on-site. These upgrades are required to comply with tightening discharge limits set by King County and state environmental permits. -
2025-01-28SEPA Environmental Checklist: Sea-Tac Airport Water System Plan Limited Update (January 2025)
This is Port of Seattle SEPA File No. 2025-01, an Environmental Checklist dated January 28, 2025, for the Seattle-Tacoma International Airport (SEA) Water System Plan (Limited Update). The document covers WDOH approval and Port adoption of the plan, with an implementation period of 2025–2028, and is prepared by contact Steve Rybolt, Senior Environmental Program Manager. -
2024-09-04Resolution 24-9-4C: Settlement Agreement and Release — Highline Water District and Port Of Seattle Regarding Tyee Well PFAS Contamination
Highline Water District reached a settlement with the Port of Seattle after PFAS chemicals, likely originating from Seattle-Tacoma International Airport operations, were found to have contaminated the District's Tyee Well, forcing the District to suspend well operations in June 2022. The contamination required the District to purchase more expensive replacement water from Seattle Public Utilities, and new EPA regulations finalized in 2024 further prohibited resuming well use without installing costly treatment facilities. The two parties negotiated a mutual release of claims to resolve the District's operational and financial losses resulting from the contamination.