County health department lab

Grays Harbor County Water Testing Lab

Montesano, WA · Grays Harbor County

Homeowner samplesYou can collect and drop off your own sample
Mail-in kitsNot listed, call to confirm
Walk-in drop offNot listed, call to confirm

Certification and services

State certified
Certification number
WA00118
Certified by
Washington drinking water program
Certified for
Microbiology, Inorganic chemistry
Lab type
County Health
Last verified
September 29, 2026

Listed on the official state certified laboratory list.

Tests this lab is certified for

Coliform Bacteria
Nitrate / Nitrite

Accredited by the Washington Department of Ecology Laboratory Accreditation Program for drinking water analyses (EPA lab ID WA00118, DOH lab number 070): Microbiology, Inorganic chemistry. Scope expires 2027-02-01. Listed by Ecology as accepting samples from the public. County health laboratory; the usual place for the yearly coliform test and a nitrate test on a private well.

How to submit a sample

  1. 1
    Call or check the website for the right bottles

    Bacteria samples need a sterile bottle from the lab. Chemistry samples usually take a clean container the lab supplies.

  2. 2
    Collect from a cold tap before treatment

    Skip softeners and filters. Remove the aerator, run the water 3 to 5 minutes, then fill without touching the inside of the cap.

  3. 3
    Keep it cold and deliver within 24 hours

    Bacteria samples are time-sensitive. Use a cooler with ice packs and hand it in or ship it the same day.

  4. 4
    Read the report against the standards

    Compare results with EPA drinking water limits. If anything is over, our problem pages explain what it means and how to treat it.

Other certified labs nearby