Filtration SystemOverview

The City continues to use a filtration system to address polyfluoroalkyl substances, or PFAS, detected in some of its well water.

Based on the latest science, the Environmental Protection Agency (EPA) has established health advisories on two PFAS, called PFOA and PFOS. 

Issaquah meets all standards set for safe drinking water, and tests its water monthly for PFOA and PFOS. Once filtered, Issaquah’s well water is below EPA’s advisories.

Issaquah participates in EPA’s unregulated contaminant monitoring program by performing additional tests on our drinking water. During that testing, detections of PFAS were found. In 2016, the City took proactive action and installed its current filtration system. 

Learn more about Issaquah's water quality via its annual report.