Is Rancho Mission Viejo, CA tap water safe?
The short answer
Santa Margarita Water District serves Rancho Mission Viejo. In EPA’s and California’s records it has 1 result above EPA’s health benchmark, and no health-based violation since 2016.
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.
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.
Water testing near Rancho Mission Viejo
The 3 labs California certifies closest to Rancho 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 4 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals
Onterris Laboratories, LLC
Orange, CA · about 22 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Envirocheck, Inc.
Orange, CA · about 22 miles
Certified for lead and copper
ZIP codes in Rancho Mission Viejo
Which ZIP codes are in Rancho 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 Rancho Mission Viejo
Other towns in Orange County with a page of their own.
What to do next
- Read Santa Margarita Water District’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About LithiumWhat it does to health, where it comes from, and the certification claim that addresses it.About Lithium
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water