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Is Sonora, CA tap water safe?

11 utilities serve Sonora, 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 11 utilities serving Sonora has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Sonora Meadows Mutual WTR Co.

Tud - Sonora/Jamestown Water System, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 4.5 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from Tud - Sonora/Jamestown Water System is soft to very hard depending on the source, 14 to 220 mg/L (0.8 to 12.9 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 Sonora’s ZIP codes, from EPA’s estimates.

1 more utility in Sonora

By EPA’s estimate, each serves fewer people in Sonora than those above.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Tud - Sonora/Jamestown Water System’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 Sonora

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 Sonora, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Precision Enviro-Tech

    Twain Harte, CA · about 8 miles

    Certified for bacteria

    (209) 477-8105

  • 49er Water Laboratory

    Jackson, CA · about 34 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (530) 277-2770

  • Aemtek, Inc.

    Modesto, CA · about 41 miles

    Certified for bacteria

    (510) 979-1979

All 145 certified labs for California

ZIP codes in Sonora

Which ZIP codes are in Sonora: 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 Sonora

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

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