Where to get your water tested in Washington: mail-in labs certified in Washington, who certifies labs there, typical costs and what to test for. We're adding Washington's local certified labs next.
Labs come from state lab accreditation records. Accreditation is granted test by test and must be renewed, so confirm the lab is currently certified for the tests you need before you collect a sample.
Ships nationwide
Single tests from $75; well and city packages $165 to $440
Not on Washington's certified list. Fine for a general check; for a home sale or an official result, use a Washington-certified lab.
Ships nationwide
About $189 to $1,125 (city and well kits, Oct 2026)
Testing service: sends your sample to a partner lab.
Certifying agencies: State programs that certify labs to conduct drinking water analyses (US EPA).
Prices vary by lab. These are one state lab's published fees, so you have a benchmark when you call around. See the full cost guide.
Tell us what your test found and we'll connect you with up to three local water treatment companies.
Free, no obligation. We don't sell your details to anyone else.
Just need a lab? Every certified lab is listed above with directions.
Labs are certified by the Washington State Department of Ecology, so confirm the lab is certified for the specific tests you need.
A basic bacteria test costs about $35 at a state public health lab, and bacteria plus nitrate about $70. Full homeowner packages run a few hundred dollars. Call two or three labs for current prices.
The EPA recommends testing a private well every year for total coliform bacteria, nitrates, total dissolved solids and pH, and right away after flooding, well repairs, or a change in taste, color or smell.
If the lab analyzing it is certified in your state for those tests, yes. For a home sale, check whether your lender requires the sample to be collected by the lab or an inspector.