Northwest (Puget Sound & islands)
Exact Scientific Services, Inc.
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.
Spectra Laboratories - Kitsap, LLC
Poulsbo drinking water lab accredited by Ecology that serves private well owners, with weekly sample pick-up sites on the Kitsap and Olympic peninsulas and in Gig Harbor.
Southwest & Olympic Peninsula
Clallam County Environmental Laboratory
Clallam County's Ecology-accredited water lab in the Port Angeles courthouse, testing private well water for coliform bacteria and nitrate, with bottles also available in Sequim and Forks.
Lewis County Environmental Health Laboratory
Lewis County's Ecology-accredited water lab in Chehalis, testing private well water for coliform bacteria and nitrate, with monthly drop-off in Morton, Randle and Packwood.
Thurston County Health Department Laboratory
Thurston County Public Health's Ecology-accredited water lab in Olympia, testing drinking water for coliform and E. coli and nitrate, with bottle pickup at satellite sites including Mason County.
Water Management Laboratories, Inc.
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.
Central Washington
Ag Health Laboratories, Inc.
Sunnyside agricultural and water lab accredited by Ecology for drinking water coliform and nitrate, with sample drop boxes in Union Gap, Pasco and Lynden.
Anatek Labs, Inc. - Yakima
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.
Benton-Franklin Health District Lab
Benton-Franklin Health District's Ecology-accredited lab in Kennewick, which runs well water tests for coliform bacteria, nitrate, hardness and fluoride.
Okanogan County Public Health Laboratory
Okanogan County Public Health's Ecology-accredited water lab, testing private well water for coliform bacteria and nitrate, with free bottles at city halls and a monthly city hall sample pick-up.