TagWashington State Department Of Health(21)

This 2025 Ambient Air Monitoring Network Plan, published by the Washington State Department of Ecology's Air Quality Program, outlines the state's ambient air quality monitoring network across Washington. Authored by Jill Schulte and released in June 2025, it provides regional office contact information and details the counties served by each of Ecology's four regional offices. Note: this document covers air quality monitoring statewide and does not contain content specifically related to Sea-Tac Airport noise policy.

A network plan for ambient air monitoring by the Air Quality Program of the Washington State Department of Ecology. The document outlines contact information, regional office structure, and accessibility policies for the department’s air quality monitoring initiatives.

The Port of Seattle submitted an environmental checklist in January 2025 for a limited update to Seattle-Tacoma International Airport's Water System Plan, covering the period 2025–2028. The update addresses routine maintenance and infrastructure improvements to SEA's drinking water and fire protection system, including pipe replacements, new surge tanks, additional water storage, and a backup water supply connection to Highline Water District. Washington State Department of Health approval and Port of Seattle Commission adoption are required before the plan can be implemented.

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.

This 2023 report from the Washington State Department of Ecology focuses on improving air quality in overburdened communities that are highly impacted by air pollution across Washington State. It outlines regional office contacts, accessibility services, and language assistance resources available to affected residents. Note: This document does not specifically address Sea-Tac Airport noise policy and may not be directly relevant to airport noise concerns.

The Highline Water District's 2022 Consumer Confidence Report details the sources, treatment, and quality testing of drinking water served to customers in the Kent and SeaTac, Washington area. Approximately 75% of the district's water comes from Seattle Public Utilities' Cedar River Watershed, with the remaining 25% drawn from local groundwater wells, all of which are treated and tested for over 200 contaminants before reaching customers. The report confirms that Highline Water District's water meets all state and federal safety standards and is significantly below EPA maximum contaminant levels.