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Is Mariposa, CA tap water safe?

3 utilities serve Mariposa, 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 3 utilities serving Mariposa has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Mariposa Pines Mutual.

Mariposa Public Utility Dist, which serves the most people here, has 1 result above the limit’s level with no violation recorded. The worst: Total trihalomethanes (TTHM) at 86.3 ppb, above the limit’s level, no violation. A health benchmark is a level EPA screens with, not a legal limit.

The water from Mariposa Public Utility Dist is soft to very hard depending on the source, 7.9 to 260 mg/L (0.5 to 15.2 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 Mariposa’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 Mariposa Public Utility Dist’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 Mariposa

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 Mariposa, 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 39 miles

    Certified for bacteria

    (209) 477-8105

  • Microbac Laboratories, Inc. - Turlock

    Turlock, CA · about 49 miles

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

    (707) 822-4649

  • SGS North America, Inc.

    Clovis, CA · about 49 miles

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

    (559) 862-2118

All 145 certified labs for California

ZIP codes in Mariposa

Which ZIP codes are in Mariposa: 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 Mariposa

Towns nearby with a page of their own.

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