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Is Maple Valley, WA tap water safe?

4 utilities serve Maple Valley, by EPA’s records. Here is what EPA’s and Washington’s records show for each, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

None of the 4 utilities serving Maple Valley has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Washington’s records.

Covington Water District, which serves the most people here, has 1 result above EPA’s new limit, which takes effect in 2029 and 1 result above the health goal. The worst: PFOS at 8.6 ppt, above EPA’s new limit, which takes effect in 2029.

The water from Covington Water District is soft, 25 mg/L (1.5 grains per gallon). How Washington’s water compares.

A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Maple Valley’s ZIP codes, from EPA’s estimates.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Covington Water District’s water, which serves the most people here. Another utility’s report names what handles its own results.

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Every claim, and more filters, in the full report

Water testing near Maple Valley

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Washington certifies.

The 3 labs Washington certifies closest to Maple Valley, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Aqua Test, Incorporated

    Maple Valley, WA · under a mile

    Certified for bacteria, nitrate

    (425) 432-9360

  • AmTest Laboratories

    Renton, WA · about 13 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, disinfection byproducts

    (425) 885-1664

  • Analytical Resources, LLC

    Tukwila, WA · about 17 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics

    (206) 695-6200

All 84 certified labs for Washington

ZIP codes in Maple Valley

Which ZIP codes are in Maple Valley: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Washington State Department of Ecology, Lab Accreditation Program, environmental laboratories accredited for drinking water analyses; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Maple Valley

Other towns in King County with a page of their own.

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