Serving roughly 15,741 people in San Joaquin County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for RIPON, CITY OF
1 water provider directly on file, serving roughly 15,741 people in San Joaquin County, California.
Quick answer: RIPON, CITY OF has no violations on file. One reading is worth knowing about: Chromium, Hex was measured at 9.7UG/L, among the highest of the 571 providers on file in this area. It's the most notable figure in this system's record among its 571 local peers.
Lead Summary
Lithium
PFOA
PFOS
PFHXS
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
Dibromoaceticacid
Nitrate
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanoicacid (PFBA)
Chromium, Hex
Trichloroethylene
Cis-1, 2-Dichloroethylene
Utility RIPON, CITY OFPopulation served 15,741Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 9.7 UG/L (ppb)
8/12/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1.3 UG/L (ppb)
8/5/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 8.3 UG/L (ppb)
2/4/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.1 UG/L (ppb)
2/4/2025
Dibromochloromethane
Detected: 0.76 UG/L (ppb)
8/5/2025
Bromoform
Detected: 1.3 UG/L (ppb)
8/5/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.4 MG/L (ppm)
10/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 9.07 µg/L (ppb)
1/14/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFOA
Detected: 0.005 µg/L (ppb)
1/14/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.012 µg/L (ppb)
1/14/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0033 µg/L (ppb)
1/14/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 0.67 UG/L (ppb)
9/9/2025
Cis-1, 2-Dichloroethylene
Detected: 1.7 UG/L (ppb)
9/9/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 1.6 UG/L (ppb)
8/5/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 3.3 NG/L (ppt)
8/12/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 13 NG/L (ppt)
8/12/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 5.2 NG/L (ppt)
8/12/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.2 NG/L (ppt)
8/12/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.