PORTERVILLE is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for PORTERVILLE, CA
3 water providers on file serving this city.
Quick answer: PORTERVILLE's water currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
Lithium
PFOS
PFBS
PFHXS
PFHXA
PFOA
PFHPA
PFPEA
PFBA
Nitrate
Chromium, Hex
Tetrachloroethylene
TTHM
Bromoform
Bromodichloromethane
Dibromochloromethane
Copper, Free
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Radium-228
Combined Uranium
Gross Alpha Particle Activity
Iron
1, 2-Dibromo-3-Chloropropane
1, 1-Dichloroethylene
Arsenic
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 3 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Chromium, Hex
Detected: 0.18 UG/L (ppb)
5/15/2025
Copper, Free
Detected: 103 UG/L (ppb)
8/29/2025
Combined Uranium
Detected: 6.43 PCI/L
9/18/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 130 UG/L (ppb)
8/13/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 2 UG/L (ppb)
3/21/2025
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
TTHM
Detected: 5 UG/L (ppb)
7/23/2025
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: 2 UG/L (ppb)
7/23/2025
Bromodichloromethane
Detected: 1 UG/L (ppb)
7/23/2025
Dibromochloromethane
Detected: 2 UG/L (ppb)
7/23/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1 MG/L (ppm)
10/29/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 8.86 PCI/L
9/18/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 10.3 µg/L (ppb)
11/20/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFOS
Detected: 0.0055 µg/L (ppb)
11/20/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0047 µg/L (ppb)
11/20/2023
PFHXS
Detected: 0.0036 µg/L (ppb)
11/20/2023
PFHXA
Detected: 0.0085 µg/L (ppb)
11/20/2023
PFOA
Detected: 0.022 µg/L (ppb)
11/20/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHPA
Detected: 0.0065 µg/L (ppb)
11/20/2023
PFPEA
Detected: 0.009 µg/L (ppb)
11/20/2023
PFBA
Detected: 0.0051 µg/L (ppb)
11/20/2023
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 2.3 UG/L (ppb)
8/13/2025
1, 1-Dichloroethylene
Detected: 0.6 UG/L (ppb)
8/13/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perfluoroctanesulfonicacid (PFOS)
Detected: 7.4 NG/L (ppt)
9/18/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 3.6 NG/L (ppt)
9/18/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanesulfonicacid (PFBS)
Detected: 4.5 NG/L (ppt)
9/18/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 5 NG/L (ppt)
9/18/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 3.1 NG/L (ppt)
9/18/2025
Perfluorohexanoicacid (PFHXA)
Detected: 7.6 NG/L (ppt)
9/18/2025
Perfluorobutanoicacid (PFBA)
Detected: 4.5 NG/L (ppt)
9/18/2025
Perfluoropentanoicacid (PFPEA)
Detected: 8.4 NG/L (ppt)
9/18/2025
Radium-228
Detected: 0.921 PCI/L
8/13/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.05 UG/L (ppb)
8/13/2025
Filtration considerations: General system types, not a specific product recommendation.