Is Lennox, CA tap water safe?
The short answer
Gswc - Southwest serves Lennox. In EPA’s and California’s records it has 3 results above the health goal and 1 result above EPA’s health benchmark, and no health-based violation since 2016.
The worst: Lithium at 51.3 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from Gswc - Southwest is moderately hard to very hard depending on the source, 120 to 280 mg/L (7 to 16.4 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 Gswc - Southwest’s water.
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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: Lead, 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: Lead, Arsenic
Water testing near Lennox
The 3 labs California certifies closest to Lennox, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Positive Lab Service
Los Angeles, CA · about 9 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
EMAX Laboratories, Inc.
Torrance, CA · about 9 miles
Certified for nitrate, minerals and other inorganics, organic chemicals, disinfection byproducts
JK BioScience Inc.
Rancho Dominguez, CA · about 9 miles
Certified for bacteria, lead and copper, metals
ZIP codes in Lennox
Which ZIP codes are in Lennox: 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 Lennox
Other towns in Los Angeles County with a page of their own.
What to do next
- Read Gswc - Southwest’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