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Is Mission Viejo, CA tap water safe?

3 utilities serve Mission Viejo, 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

None of the 3 utilities serving Mission Viejo has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records.

Santa Margarita Water District, which serves the most people here, has 1 result above EPA’s health benchmark. The worst: Lithium at 50.1 ppb, above EPA’s health benchmark. A health benchmark is a level EPA screens with, not a legal limit.

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 Mission Viejo’s ZIP codes, from EPA’s estimates.

Water testing near Mission Viejo

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

  • Sierra Analytical Labs, Inc.

    Laguna Hills, CA · about 3 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals

    (949) 348-9389

  • Onterris Laboratories, LLC

    Orange, CA · about 18 miles

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

    (714) 771-6900

  • Envirocheck, Inc.

    Orange, CA · about 18 miles

    Certified for lead and copper

    (714) 937-0750

All 145 certified labs for California

ZIP codes in Mission Viejo

Which ZIP codes are in Mission Viejo: 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 Mission Viejo

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

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