Is Ceres, CA tap water safe?
The short answer
3 of the 4 utilities serving Ceres have a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records: City of Ceres, Keyes Community Services Dist. and Monterey Park Tract CSD.
City of Ceres, which serves the most people here, has 2 results above EPA’s new limit, which takes effect in 2029, 3 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOS at 24 ppt, above EPA’s new limit, which takes effect in 2029.
The water from City of Ceres is soft to very hard depending on the source, 47 to 478 mg/L (2.8 to 27.9 grains per gallon). How California’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Ceres’s ZIP codes, from EPA’s estimates.
- Open report
City of Ceres
California · serves 54,513 people · about 7,300 in Ceres
2 results above EPA’s new limit, which takes effect in 2029, 3 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOS at 24 ppt, above EPA’s new limit, which takes effect in 2029. Hardness: soft to very hard depending on the source, 47 to 478 mg/L (2.8 to 27.9 grains per gallon).
1 health-based violation since 2016
- Open report
City of Modesto
California · serves 218,915 people · about 4,500 in Ceres
2 results above EPA’s new limit, which takes effect in 2029, 4 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFOS at 26 ppt, above EPA’s new limit, which takes effect in 2029. Hardness: soft to very hard depending on the source, 35 to 388 mg/L (2 to 22.7 grains per gallon).
No health-based violations since 2016
- Open report
Keyes Community Services Dist.
California · serves 5,672 people · about 290 in Ceres
1 result above the legal limit and 2 results above the health goal. The worst: Arsenic at 8.6 ppb, above the legal limit. Hardness: soft to moderately hard depending on the source, 53 to 112 mg/L (3.1 to 6.5 grains per gallon).
17 health-based violations since 2016
- Open report
Monterey Park Tract CSD
California · serves 186 people · under 100 in Ceres
2 results above the legal limit. The worst: Arsenic at 35.4 ppb, above the legal limit.
4 health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Ceres’s water, which serves the most people here. Another utility’s report names what handles its own results.
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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
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: PFOS, PFOA, Arsenic
Water testing near Ceres
The 3 labs California certifies closest to Ceres, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Aemtek, Inc.
Modesto, CA · about 7 miles
Certified for bacteria
Institute of Environmental Health, Inc. dba IEH-JL Analytical
Modesto, CA · about 8 miles
Certified for bacteria, nitrate, minerals and other inorganics
Certified Laboratories - Turlock
Turlock, CA · about 10 miles
Certified for bacteria
Which ZIP codes are in Ceres: 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 Ceres
Other towns in Stanislaus County with a page of their own.
What to do next
- Read City of Ceres’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