Is Mayfair, CA tap water safe?
The short answer
City of Fresno serves Mayfair. In EPA’s and California’s records it has 3 results above EPA’s new limit, which takes effect in 2029 and 3 results above the health goal, and no health-based violation since 2016.
The worst: PFOS at 30 ppt, above EPA’s new limit, which takes effect in 2029.
The water from City of Fresno is soft to very hard depending on the source, 8.8 to 390 mg/L (0.5 to 22.8 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 Fresno’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: PFOS, PFOA, 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: PFOS, PFOA, 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: PFOS, PFOA, PFHxS, Nitrate
Water testing near Mayfair
The 3 labs California certifies closest to Mayfair, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Moore Twining Associates, Inc.
Fresno, CA · about 2 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity
Dellavalle Laboratory, Inc.
Fresno, CA · about 4 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, radioactivity
BSK Associates
Fresno, CA · about 5 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity
ZIP codes in Mayfair
Which ZIP codes are in Mayfair: 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 Mayfair
Other towns in Fresno County with a page of their own.
What to do next
- Read City of Fresno’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for PFOSRanked by certification and what they cost over five years.The best water filters for PFAS, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water