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Is Mammoth Lakes, CA tap water safe?

2 utilities serve Mammoth Lakes, 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 2 utilities serving Mammoth Lakes has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Mammoth CWD.

Mammoth CWD, which serves the most people here, has 1 result above the limit’s level with no violation recorded, 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Arsenic at 61.1 ppb, above the limit’s level, no violation. Health goals are stricter than legal limits and are not enforced.

The water from Mammoth CWD is soft to very hard depending on the source, 18 to 205 mg/L (1.1 to 12 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 Mammoth Lakes’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 Mammoth CWD’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 Mammoth Lakes

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

  • Inyo County Water Lab

    Independence, CA · about 62 miles

    Certified for bacteria

    (760) 878-8476

  • SGS North America, Inc.

    Clovis, CA · about 66 miles

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

    (559) 862-2118

  • BSK Associates

    Fresno, CA · about 72 miles

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

    (559) 497-2888

All 145 certified labs for California

ZIP codes in Mammoth Lakes

Which ZIP codes are in Mammoth Lakes: 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 Mammoth Lakes

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

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