Serving roughly 74,877 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for COMPTON-CITY, WATER DEPT.
1 water provider directly on file, serving roughly 74,877 people in Los Angeles County, California.
Quick answer: COMPTON-CITY, WATER DEPT. has no violations on file. One reading is worth knowing about: Lithium was measured at 58µg/L, among the highest of the 601 providers on file in this area. It's the most notable figure in this system's record among its 601 local peers.
Lead Summary
Lithium
PFHXS
PFOA
PFOS
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dibromoaceticacid
Dichloroaceticacid
Trichloroaceticacid
Nitrate
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanoicacid (PFBA)
1, 4-Dioxane
Manganese
Chromium, Hex
Tetrachloroethylene
Trichloroethylene
Cis-1, 2-Dichloroethylene
Utility COMPTON-CITY, WATER DEPT.Population served 74,877Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Manganese
Detected: 34 UG/L (ppb)
9/11/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.39 UG/L (ppb)
7/18/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 3.3 UG/L (ppb)
9/9/2025
TTHM
Detected: 12 UG/L (ppb)
9/9/2025
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: 1.2 UG/L (ppb)
9/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 5 UG/L (ppb)
9/9/2025
Bromodichloromethane
Detected: 1.8 UG/L (ppb)
9/9/2025
Dibromochloromethane
Detected: 4 UG/L (ppb)
9/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.2 MG/L (ppm)
4/25/2025
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: 58 µg/L (ppb)
5/9/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.004 µg/L (ppb)
2/22/2024
PFOA
Detected: 0.0049 µg/L (ppb)
9/14/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.014 µg/L (ppb)
2/22/2024
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
Tetrachloroethylene
Detected: 0.68 UG/L (ppb)
7/18/2025
Trichloroethylene
Detected: 0.92 UG/L (ppb)
7/18/2025
Cis-1, 2-Dichloroethylene
Detected: 1.2 UG/L (ppb)
7/18/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 2.2 UG/L (ppb)
9/9/2025
Dichloroaceticacid
Detected: 1.1 UG/L (ppb)
9/9/2025
Trichloroaceticacid
Detected: 1.3 UG/L (ppb)
9/9/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.3 NG/L (ppt)
7/18/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 16 NG/L (ppt)
7/18/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.6 NG/L (ppt)
7/18/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.1 NG/L (ppt)
7/18/2025
1, 4-Dioxane
Detected: 1.3 UG/L (ppb)
7/18/2025
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.