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Is Clearlake, CA tap water safe?

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

Matched to your utility using EPA records.

The short answer

1 of the 4 utilities serving Clearlake has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Highlands Mutual Water Company.

Highlands Mutual Water Company, which serves the most people here, has 1 result above the legal limit, 1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Haloacetic acids (HAA5) at 42.6 ppb, above the legal limit.

The water from Highlands Mutual Water Company is hard, typically 140 mg/L (8.2 grains per gallon). How California’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 Clearlake’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 Highlands Mutual Water Company’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 Clearlake

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 California certifies.

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

  • K Prime, LLC.

    Santa Rosa, CA · about 33 miles

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

    (707) 527-7574

  • Alpha Analytical Laboratories, Inc. - Ukiah

    Ukiah, CA · about 34 miles

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

    (707) 468-0401

  • Sonoma County Public Health Laboratory

    Santa Rosa, CA · about 35 miles

    Certified for bacteria

    (707) 565-4711

All 145 certified labs for California

ZIP codes in Clearlake

Which ZIP codes are in Clearlake: 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: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Clearlake

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

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