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Is Jamestown, CA tap water safe?

5 utilities serve Jamestown, 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

2 of the 5 utilities serving Jamestown have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Cdcr - Sierra Conservation Center and Cal Fire Baseline Conservation Camp.

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 Jamestown’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 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 Jamestown

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 Jamestown, 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 13 miles

    Certified for bacteria

    (209) 477-8105

  • Aemtek, Inc.

    Modesto, CA · about 35 miles

    Certified for bacteria

    (510) 979-1979

  • 49er Water Laboratory

    Jackson, CA · about 36 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (530) 277-2770

All 145 certified labs for California

ZIP codes in Jamestown

Which ZIP codes are in Jamestown: 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 Jamestown

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

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