Free Washington water report: PFAS & lead levels for every water system, worst-affected cities, and EPA violations. Check your ZIP.
Washington State's 7.8 million residents benefit from some of the most abundant freshwater resources in the nation – fed by Cascade Range snowpack, Puget Sound watershed rivers, and the Columbia River system. Seattle draws from the Cedar and Tolt rivers in the Cascade foothills; Tacoma uses the Green River; and Spokane sits atop the Spokane Valley-Rathdrum Prairie Aquifer, one of the most productive sole-source aquifers in the western United States. Smaller communities across the state rely on a mix of surface water, groundwater, and small system wells. The Washington State Department of Health (DOH) regulates public water systems, while the Department of Ecology handles broader environmental protection.
Fairchild Air Force Base near Spokane is the most significant military PFAS concern in Washington – and one of the most consequential in the nation. The base sits directly above the Spokane Valley-Rathdrum Prairie Aquifer, which the EPA has designated as a sole-source aquifer. This means there is no feasible alternative drinking water source for the communities that depend on it. PFAS from decades of AFFF use at Fairchild has been detected in groundwater, and the potential for contaminant migration into the aquifer's primary supply zone makes this a high-stakes remediation challenge. The City of Airway Heights, located adjacent to the base, discovered PFAS in its municipal wells and was forced to connect to an alternative water supply.
NAS Whidbey Island, the Navy's premier Pacific Northwest air station, is the other major military PFAS source. Located on Whidbey Island in Puget Sound, the base's AFFF use has contaminated groundwater affecting nearby communities. The island geography limits water supply alternatives, making contamination particularly consequential.
Beyond military sources, Washington has industrial PFAS contamination from manufacturing facilities, airports, and firefighting training facilities across the state. The Puget Sound region's aerospace, technology, and manufacturing sectors have contributed to industrial contamination in multiple locations.
Washington has taken one of the most aggressive state-level approaches to PFAS in the country. The state legislature passed landmark PFAS legislation that restricts PFAS in food packaging, firefighting foam, cosmetics, and other consumer products. The Department of Ecology has been at the forefront of PFAS source identification and regulation.
The state adopted PFAS action levels of 10 ppt for PFOA, 15 ppt for PFOS, and a combined 70 ppt for five PFAS compounds – among the strictest in the nation. These levels trigger investigation, public notification, and treatment requirements when exceeded. Washington was one of the first states to ban AFFF for training purposes and has pushed for federal PFAS regulation.
Among western states, Washington's proactive stance contrasts with the more cautious approaches in Oregon, Utah, and Idaho. California has been similarly aggressive on regulation but faces a much larger and more complex contamination landscape. Washington's relatively concentrated population and well-defined contamination sources make targeted response more feasible.
The Fairchild/sole-source aquifer situation is nationally significant. The combination of military PFAS contamination and sole-source aquifer designation creates a scenario where failure to contain the plume could compromise the only drinking water source for a major metropolitan area. Spokane, with a metro population of roughly 600,000, depends entirely on this aquifer.
Washington's water quality is generally excellent – mountain-fed surface water and protected aquifers provide a strong baseline. But proximity to contamination sources can override that baseline.
1. Check your water quality using our free tool. Washington has more monitoring data available than many states due to its aggressive testing program. 2. Spokane-area residents should be aware of the Fairchild AFB contamination and check whether their water provider has been affected. Airway Heights residents were directly impacted; surrounding communities should monitor updates. Our water filter guide covers PFAS-specific treatment options. 3. Whidbey Island residents near NAS Whidbey should also check local monitoring data. Island communities have limited water supply alternatives, making contamination management critical. 4. For residents on private wells anywhere in the state, independent PFAS testing is advisable – particularly near airports, industrial sites, or military facilities. A detailed water report can provide context for your area.
Washington's water infrastructure reflects the Pacific Northwest's abundance and engineering ambition. Seattle's watershed protection program, which manages over 90,000 acres of protected forest in the Cedar River and Tolt River watersheds, produces some of the highest-quality municipal water in the country. The system dates to the early 1900s and has been expanded and hardened over generations.
Spokane's relationship with its aquifer is equally long-standing but more precarious. The Spokane Valley-Rathdrum Prairie Aquifer, which stretches from eastern Washington into northern Idaho, was designated as a sole-source aquifer by the EPA in 1978. The aquifer receives recharge from the Spokane River and precipitation, and its glacial gravel composition allows water to move relatively quickly – which means contaminants can also travel faster than in finer-grained aquifer systems.
Fairchild Air Force Base has been operational since 1942. The base, which currently hosts KC-135 refueling tanker operations, has used AFFF at fire training areas and in emergency response throughout its history. PFAS contamination was identified as part of the DoD's nationwide investigation, and the Air Force has been working with local authorities on response. The Airway Heights municipal wells were shut down after PFAS was detected at levels exceeding Washington's action limits – a concrete example of what military contamination means for neighboring communities.
NAS Whidbey Island has been operational since 1942 and currently hosts electronic warfare and patrol squadrons. The base's PFAS contamination has affected the surrounding area, and the Navy is conducting investigation and response activities. On an island where water supply options are constrained by geography, contamination carries outsized consequences.
Washington's legislative response has been among the most comprehensive in the country. Beyond drinking water standards, the state has banned PFAS in food packaging (effective 2023), restricted PFAS in firefighting foam for training (with a full ban on AFFF taking effect in phases), and funded research into PFAS treatment technologies. The state's approach reflects both the severity of its contamination challenges and a political environment that supports aggressive environmental regulation.
Puget Sound itself is the subject of an ongoing cleanup and restoration effort. The sound receives stormwater, industrial discharge, and wastewater from the Seattle-Tacoma metro area, and PFAS has been detected in both the water and sediment. While Puget Sound is not a drinking water source, it is a critical ecosystem and food source – PFAS accumulation in fish and shellfish represents an exposure pathway separate from tap water.
Check your address to see what the data shows for your specific location. Washington takes PFAS more seriously than most states, and the data available to residents reflects that commitment.