State-certified labTakes homeowner samples

Seattle-King County Department of Public Health Lab

Seattle, WA · King CountyCounty health department lab

Call (206) 744-8950
WebsiteDirections
Certification
State certified
list checked September 29, 2026
Certificate
WA00128
Washington program
Tests listed
1
Coliform Bacteria
Homeowner samples
Yes
Drop-off

About Seattle-King County Department of Public Health Lab

Seattle-King County Department of Public Health Lab is a county health department lab in Seattle, WA (King County). It is on the Washington drinking water program's list of certified laboratories (certificate WA00128), and we last checked the list on September 29, 2026.

The lab takes samples from homeowners.

Before you go: Accredited by the Washington Department of Ecology Laboratory Accreditation Program for drinking water analyses (EPA lab ID WA00128, DOH lab number 075): Microbiology. Scope expires 2027-07-31. 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.

This profile is built from the official state list of certified drinking water laboratories, checked on September 29, 2026. Well Water Insider does not rate or endorse labs. Run this lab? Claim the profile to add prices, turnaround times, hours and a description.

Certification and services

State certified
Certification number
WA00128
Certified by
Washington drinking water program
Certified for
Microbiology
Lab type
County Health
Last verified
September 29, 2026

Listed on the official state certified laboratory list.

How to test your water here

How this lab takes samples, based on its listing. Call to confirm hours, bottles and prices.

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

Published lab fees in Washington: $21 to $55 for a bacteria test and $21 to $55 for nitrate. Washington DOH list of certified labs; the Thurston County water lab charges $32 for each test. Prices at this lab may differ.

  1. 1

    Call 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.

Tests this lab is listed for

From the state certification list and the lab's own listing. Ask which ones it runs for homeowners.

Coliform Bacteria

Total coliform and E. coli. The test the CDC recommends every year for every private well. Learn more

Location

325 Ninth Ave, Seattle, WA 98104

Lab address

Questions about Seattle-King County Department of Public Health Lab

Is Seattle-King County Department of Public Health Lab state certified?

Yes. It is on the Washington list of laboratories certified for drinking water testing, last checked September 29, 2026.

What can Seattle-King County Department of Public Health Lab test well water for?

Its listing covers coliform bacteria. Call to confirm prices and which tests it runs for private well owners.

Can I bring my own well water sample?

Yes, the listing says it takes homeowner samples. Get the right bottle from the lab first, especially for bacteria.

How do I contact Seattle-King County Department of Public Health Lab?

Call (206) 744-8950 and visit the lab's website. The address is 325 Ninth Ave, Seattle, WA 98104.

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