Skip to content
TapBuff
ZIP

Is San Martin, CA tap water safe?

8 utilities serve San Martin, 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

3 of the 8 utilities serving San Martin have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: City of Gilroy, Cal Am - West San Martin and Chiri Sweet Water Company.

City of Gilroy, which serves the most people here, has 1 result above the legal limit, 2 results above EPA’s new limit, which takes effect in 2029 and 2 results above the health goal. The worst: Nitrate at 12 ppm, above the legal limit.

The water from City of Gilroy is hard to very hard depending on the source, 180 to 287 mg/L (10.5 to 16.8 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 San Martin’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 City of Gilroy’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 San Martin

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

  • CM Analytical, Inc.

    Gilroy, CA · about 4 miles

    Certified for bacteria

    (408) 848-3619

  • Bracewell Engineering, Inc.

    Morgan Hill, CA · about 6 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (669) 258-5821

  • Santa Cruz County - Health Services Agency - Environmental Health

    Santa Cruz, CA · about 25 miles

    Certified for bacteria

    (831) 454-4624

All 145 certified labs for California

ZIP codes in San Martin

Which ZIP codes are in San Martin: 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 Martin

Other towns in Santa Clara County with a page of their own.

What to do next