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Is Union City, CA tap water safe?

2 utilities serve Union City, 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

Neither of the 2 utilities serving Union City has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records.

Alameda County Water District, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 0.39 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from Alameda County Water District is soft to hard depending on the source, 40 to 138 mg/L (2.3 to 8.1 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 Union City’s ZIP codes, from EPA’s estimates.

MUD stands for municipal utility district, a local water and sewer district common in Texas.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Alameda County Water District’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 Union City

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

  • SGS North America

    Hayward, CA · about 6 miles

    Certified for bacteria

    (510) 266-8183

  • Alpha Analytical Laboratories, Inc.

    Livermore, CA · about 7 miles

    Certified for bacteria

    (707) 769-3128

  • EMSL Analytical Inc.

    San Leandro, CA · about 10 miles

    Certified for asbestos

    (510) 895-3675

All 145 certified labs for California

ZIP codes in Union City

Which ZIP codes are in Union City: 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 Union City

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

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