Serving roughly 50,375 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for GSWC - ARTESIA
1 water provider directly on file, serving roughly 50,375 people in Los Angeles County, California.
Quick answer: GSWC - ARTESIA has no violations on file. One reading is worth knowing about: Copper, Free was measured at 450UG/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
PFOS
PFHXS
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Copper, Free
Manganese
Iron
Arsenic
Nitrate
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanoicacid (PFBA)
Combined Uranium
Chromium, Hex
Trichloroethylene
Tetrachloroethylene
1, 1-Dichloroethylene
Perchlorate
Utility GSWC - ARTESIAPopulation served 50,375Owner 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
Copper, Free
Detected: 450 UG/L (ppb)
9/12/2025
Manganese
Detected: 64 UG/L (ppb)
10/8/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 54 UG/L (ppb)
10/8/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 2 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.
Combined Uranium
Detected: 2.9 PCI/L
2/10/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Chromium, Hex
Detected: 0.04 UG/L (ppb)
3/10/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 8.7 UG/L (ppb)
8/6/2025
TTHM
Detected: 8.6 UG/L (ppb)
8/6/2025
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: 6.3 UG/L (ppb)
8/6/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 1.2 UG/L (ppb)
2/4/2025
Bromodichloromethane
Detected: 1.6 UG/L (ppb)
8/6/2025
Dibromochloromethane
Detected: 4.2 UG/L (ppb)
2/4/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.4 MG/L (ppm)
2/4/2025
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
PFOS
Detected: 0.011 µg/L (ppb)
11/8/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0034 µg/L (ppb)
7/21/2023
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 0.57 UG/L (ppb)
5/14/2025
Tetrachloroethylene
Detected: 0.57 UG/L (ppb)
5/14/2025
1, 1-Dichloroethylene
Detected: 0.54 UG/L (ppb)
8/5/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 6.8 UG/L (ppb)
8/6/2025
Trichloroaceticacid
Detected: 1.9 UG/L (ppb)
8/6/2025
Dibromoaceticacid
Detected: 1.3 UG/L (ppb)
2/4/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 3.8 NG/L (ppt)
10/8/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 16 NG/L (ppt)
10/8/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.2 NG/L (ppt)
10/8/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.8 NG/L (ppt)
10/8/2025
Perchlorate
Detected: 1.1 UG/L (ppb)
2/4/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
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.