Serving roughly 84,928 people in San Joaquin County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for MANTECA, CITY OF
1 water provider directly on file, serving roughly 84,928 people in San Joaquin County, California.
Quick answer: MANTECA, CITY OF has no violation currently counted toward its compliance status. EPA's record shows a Selenium violation dating to 07/01/1987 (39 years ago) — because it's more than five years past its deadline, EPA's policy no longer treats it as part of this system's current standing, though it remains on the public record.
Lead Summary
PFBS
PFHXS
PFHXA
PFOA
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Monochloroaceticacid
Silica
Nitrate
Vanadium, Total
1, 2, 3-Trichloropropane
Arsenic
Utility MANTECA, CITY OFPopulation served 84,928Owner Local government
Often added deliberately for dental health; can also occur naturally.
Nitrate
Older/archived health-based violation
Found at 1 of 1 provider
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Arsenic
Older/archived health-based violation
Found at 1 of 1 provider
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0004 mg/L (ppm)
12/31/2024
Vanadium, Total
Detected: 34 UG/L (ppb)
9/9/2025
Arsenic
Detected: 11.1 UG/L (ppb)
9/2/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 17 UG/L (ppb)
10/13/2025
TTHM
Detected: 24 UG/L (ppb)
10/13/2025
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: 18 UG/L (ppb)
10/13/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 3 UG/L (ppb)
10/13/2025
Dibromochloromethane
Detected: 2 UG/L (ppb)
10/13/2025
Bromoform
Detected: 1 UG/L (ppb)
10/13/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 5.3 MG/L (ppm)
9/2/2025
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
PFBS
Detected: 0.0039 µg/L (ppb)
7/15/2025
PFHXS
Detected: 0.018 µg/L (ppb)
7/15/2025
PFHXA
Detected: 0.0095 µg/L (ppb)
7/15/2025
PFOA
Detected: 0.007 µg/L (ppb)
7/15/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.027 UG/L (ppb)
10/13/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 9 UG/L (ppb)
10/13/2025
Trichloroaceticacid
Detected: 8 UG/L (ppb)
10/13/2025
Dibromoaceticacid
Detected: 3 UG/L (ppb)
10/13/2025
Monochloroaceticacid
Detected: 2 UG/L (ppb)
10/13/2025
Silica
Detected: 52.1 MG/L (ppm)
9/9/2025
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.