Northwest (Puget Sound & islands)

• Exact Scientific Services, Inc.

  Water testing labs

  Ferndale lab accredited by Ecology for drinking water, offering homeowner well tests for coliform bacteria, nitrate, a metals and minerals panel including arsenic and lead, and a nuisance panel.

  Ferndale · Whatcom CountyAccredited lab

Southwest & Olympic Peninsula

• Water Management Laboratories, Inc.

  Water testing labs

  Tacoma drinking water lab accredited by Ecology, testing coliform bacteria, nitrate and metals including arsenic, with weekly sample drop-off points from Enumclaw to Aberdeen and Chehalis.

  Tacoma · Pierce, King, Kitsap +4 more countiesAccredited lab

Central Washington

• Anatek Labs, Inc. - Yakima

  Water testing labs

  Yakima branch of Anatek Labs, an Ecology-accredited drinking water lab that offers private well tests for bacteria, nitrate, metals including arsenic, and PFAS, with sampling kits by request.

  Yakima · Yakima CountyAccredited lab