Serving roughly 63,500 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for GSWC - FLORENCE/GRAHAM
1 water provider directly on file, serving roughly 63,500 people in Los Angeles County, California.
Quick answer: GSWC - FLORENCE/GRAHAM has no violations on file. One reading is worth knowing about: Cis-1, 2-Dichloroethylene was measured at 3.4UG/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
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dibromoaceticacid
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Chromium, Hex
1, 2-Dichloroethane
Carbontetrachloride
Trichloroethylene
Cis-1, 2-Dichloroethylene
Utility GSWC - FLORENCE/GRAHAMPopulation served 63,500Owner 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: 80 UG/L (ppb)
9/19/2025
Chromium, Hex
Detected: 1.2 UG/L (ppb)
10/20/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 6.2 UG/L (ppb)
2/4/2025
TTHM
Detected: 34 UG/L (ppb)
8/5/2025
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: 4.8 UG/L (ppb)
8/5/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 10 UG/L (ppb)
8/5/2025
Bromodichloromethane
Detected: 7.9 UG/L (ppb)
8/5/2025
Dibromochloromethane
Detected: 11 UG/L (ppb)
8/5/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 43 µg/L (ppb)
12/2/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2-Dichloroethane
Detected: 1 UG/L (ppb)
9/29/2025
Carbontetrachloride
Detected: 1.2 UG/L (ppb)
9/29/2025
Trichloroethylene
Detected: 5.2 UG/L (ppb)
9/29/2025
Cis-1, 2-Dichloroethylene
Detected: 3.4 UG/L (ppb)
8/7/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 2.4 UG/L (ppb)
8/5/2025
Dichloroaceticacid
Detected: 2 UG/L (ppb)
8/5/2025
Trichloroaceticacid
Detected: 1 UG/L (ppb)
8/5/2025
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.