NORCO is served by 1 water provider on file with the EPA.
Data current as of July 2026
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Results for NORCO, CA
1 water provider on file serving this city.
Quick answer: NORCO's water has no violation currently counted toward its compliance status. EPA's record shows a Fluoride violation dating to 06/01/1986 (40 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
Lithium
PFPEA
PFHXA
PFBS
PFHXS
PFOS
PFOA
PFBA
Fluoride
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Iron
Arsenic
TDS
Manganese
Totalhaloaceticacids (HAA5)
TTHM
Bromoform
Bromodichloromethane
Dibromochloromethane
Dibromoaceticacid
Chloroform
Dichloroaceticacid
Trichloroaceticacid
Violations on file
Fluoride
Older/archived health-based violation
Found at 1 of 1 provider
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.
TTHM
Older/archived health-based violation
Found at 1 of 1 provider
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.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Iron
Detected: 950 UG/L (ppb)
10/6/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 2.8 UG/L (ppb)
10/20/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Manganese
Detected: 24 UG/L (ppb)
2/3/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 11.2 UG/L (ppb)
8/7/2025
TTHM
Detected: 8.2 UG/L (ppb)
8/7/2025
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.
Bromoform
Detected: 3.6 UG/L (ppb)
8/7/2025
Bromodichloromethane
Detected: 1.5 UG/L (ppb)
8/7/2025
Dibromochloromethane
Detected: 3.1 UG/L (ppb)
8/7/2025
Chloroform
Detected: 2.2 UG/L (ppb)
8/7/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 3.2 MG/L (ppm)
10/20/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 3.8 MG/L (ppm)
2/18/2025
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: 35.6 µg/L (ppb)
6/18/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFPEA
Detected: 0.0076 µg/L (ppb)
3/20/2024
PFHXA
Detected: 0.0037 µg/L (ppb)
3/20/2024
PFBS
Detected: 0.0122 µg/L (ppb)
3/20/2024
PFHXS
Detected: 0.0138 µg/L (ppb)
3/20/2024
PFOS
Detected: 0.0314 µg/L (ppb)
3/20/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0137 µg/L (ppb)
3/20/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBA
Detected: 0.0179 µg/L (ppb)
3/20/2024
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorobutanesulfonicacid (PFBS)
Detected: 2 NG/L (ppt)
10/7/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.5 NG/L (ppt)
10/7/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 6.8 NG/L (ppt)
10/7/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4 NG/L (ppt)
10/7/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 2 NG/L (ppt)
10/7/2025
Perfluorobutanoicacid (PFBA)
Detected: 2.7 NG/L (ppt)
10/7/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2.1 NG/L (ppt)
10/7/2025
TDS
Detected: 500 MG/L (ppm)
9/10/2025
Dibromoaceticacid
Detected: 7.5 UG/L (ppb)
8/7/2025
Dichloroaceticacid
Detected: 2.4 UG/L (ppb)
8/7/2025
Trichloroaceticacid
Detected: 1.3 UG/L (ppb)
8/7/2025
Filtration considerations: General system types, not a specific product recommendation.