Skip to content
TapBuff
ZIP

Is Muir Beach, CA tap water safe?

3 utilities serve Muir Beach, 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 Muir Beach has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: Green Gulch Farm.

Marin Municipal Water District, which serves the most people here, has 1 result above the health goal. The worst: Arsenic at 0.27 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from Marin Municipal Water District is soft to moderately hard depending on the source, 53 to 117 mg/L (3.1 to 6.8 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 Muir Beach’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 Marin Municipal Water District’s water, which serves the most people here. Another utility’s report names what handles its own results.

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Every claim, and more filters, in the full report

Water testing near Muir Beach

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

  • Cel Analytical, Inc.

    San Francisco, CA · about 9 miles

    Certified for bacteria, minerals and other inorganics

    (415) 882-1690

  • Asbestos TEM Laboratories, Inc

    Oakland, CA · about 13 miles

    Certified for asbestos

    (510) 704-8930

  • Eurofins Built Environment Testing West, LLC

    Emeryville, CA · about 14 miles

    Certified for lead and copper

    (510) 653-0824

All 145 certified labs for California

ZIP codes in Muir Beach

Which ZIP codes are in Muir Beach: 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 Muir Beach

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

What to do next