Serving roughly 3,441 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for SAN ANTONIO WATER COMPANY
1 water provider directly on file, serving roughly 3,441 people in San Bernardino County, California.
Quick answer: SAN ANTONIO WATER COMPANY has no violations on file. One reading is worth knowing about: Perfluoroheptanoicacid (PFHPA) was measured at 4NG/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
Lead
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
1, 2-Dibromo-3-Chloropropane
Utility SAN ANTONIO WATER COMPANYPopulation served 3,441Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Lead
Detected: 35 UG/L (ppb)
6/12/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 120 UG/L (ppb)
6/17/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 4.5 UG/L (ppb)
8/12/2025
TTHM
Detected: 8.1 UG/L (ppb)
8/12/2025
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: 5.6 UG/L (ppb)
8/12/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 2.5 UG/L (ppb)
8/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3.5 MG/L (ppm)
4/15/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 2.6 UG/L (ppb)
8/12/2025
Trichloroaceticacid
Detected: 1.9 UG/L (ppb)
8/12/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 5.2 NG/L (ppt)
10/13/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4 NG/L (ppt)
10/13/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.8 NG/L (ppt)
10/13/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 6.3 NG/L (ppt)
10/13/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 9.8 NG/L (ppt)
10/13/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 7 NG/L (ppt)
10/13/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.6 NG/L (ppt)
10/13/2025
Perfluoropentanoicacid (PFPEA)
Detected: 7.1 NG/L (ppt)
10/13/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.08 UG/L (ppb)
4/15/2025
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.