Is Moss Beach, CA tap water safe?
The short answer
Montara Water and Sanitary District serves Moss Beach. In EPA’s and California’s records it has 2 results above the health goal, and no health-based violation since 2016.
The worst: Nitrate at 13 ppm, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Montara Water and Sanitary District is soft to very hard depending on the source, 55 to 240 mg/L (3.2 to 14 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 Montara Water and Sanitary District’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: Nitrate, 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: Nitrate, Arsenic
Culligan 10-Cup Pitcher with ZeroWater Technology (ZEROP10)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Nitrate
Water testing near Moss Beach
The 3 labs California certifies closest to Moss Beach, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Garratt-Callahan Laboratory
Burlingame, CA · about 9 miles
Certified for nitrate, metals, minerals and other inorganics
Eurofins Built Environment Testing West-Burlingame
Burlingame, CA · about 10 miles
Certified for bacteria
San Mateo County Public Health Laboratory
San Mateo, CA · about 12 miles
Certified for bacteria
ZIP codes in Moss Beach
Which ZIP codes are in Moss 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 Moss Beach
Other towns in San Mateo County with a page of their own.
What to do next
- Read Montara Water and Sanitary District’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for NitrateRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water