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Is San Dimas, CA tap water safe?

Gswc - San Dimas serves San Dimas, by EPA’s records. Here is what EPA’s and California’s records show for it, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

Gswc - San Dimas serves San Dimas. In EPA’s and California’s records it has 1 result above EPA’s new limit, which takes effect in 2029, 4 results above the health goal and 1 result above EPA’s health benchmark, and no health-based violation since 2016.

The worst: PFOS at 4.6 ppt, above EPA’s new limit, which takes effect in 2029.

The water from Gswc - San Dimas is very hard, typically 299 mg/L (17.5 grains per gallon). How California’s water compares.

Some homes in a town are on private wells or a small system of their own. The name on your water bill tells you which is yours.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Gswc - San Dimas’s water.

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Every claim, and more filters, in the full report

Water testing near San Dimas

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

  • Eurofins Pomona

    Pomona, CA · about 3 miles

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

    (626) 386-1100

  • Enviro-Chem, Inc.

    Pomona, CA · about 7 miles

    Certified for metals

    (909) 590-5905

  • Western Analytical Laboratories, Inc.

    Chino, CA · about 10 miles

    Certified for bacteria, minerals and other inorganics

    (909) 627-3628

All 145 certified labs for California

ZIP codes in San Dimas

Which ZIP codes are in San Dimas: 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 San Dimas

Other towns in Los Angeles County with a page of their own.

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