Is Seal Beach, CA tap water safe?
The short answer
City of Seal Beach serves Seal Beach. 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 35.5 ppb, above EPA’s health benchmark. Health goals are stricter than legal limits and are not enforced.
The water from City of Seal Beach is soft to moderately hard depending on the source, 36 to 98 mg/L (2.1 to 5.7 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 City of Seal Beach’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 Seal Beach
The 3 labs California certifies closest to Seal Beach, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Moore Institute for Plastic Pollution Research
Long Beach, CA · about 2 miles
LA Testing
Huntington Beach, CA · about 3 miles
Certified for lead and copper, metals
Food Microbiological Laboratories, Inc.
Cypress, CA · about 5 miles
Certified for bacteria
Which ZIP codes are in Seal Beach: 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 Seal Beach
Other towns in Orange County with a page of their own.
What to do next
- Read City of Seal Beach’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