Is Hidden Hills, CA tap water safe?
The short answer
Las Virgenes MWD serves Hidden Hills. In EPA’s and California’s records it has 2 results above the health goal and 1 result above EPA’s health benchmark, and no health-based violation since 2016.
The worst: Lithium at 15 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Las Virgenes MWD is hard, 141 mg/L (8.2 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 Las Virgenes MWD’s water.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Hidden Hills
The 3 labs California certifies closest to Hidden Hills, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Pat-Chem Laboratories
San Fernando, CA · about 17 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity
Camrosa Water District Wastewater Laboratory
Camarillo, CA · about 22 miles
Certified for bacteria
Positive Lab Service
Los Angeles, CA · about 25 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
ZIP codes in Hidden Hills
Which ZIP codes are in Hidden Hills: 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 Hidden Hills
Other towns in Los Angeles County with a page of their own.
What to do next
- Read Las Virgenes MWD’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