Serving roughly 39,345 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for SAN GABRIEL COUNTY WD
1 water provider directly on file, serving roughly 39,345 people in Los Angeles County, California.
Quick answer: SAN GABRIEL COUNTY WD has no violations on file. One reading is worth knowing about: Fluoride was measured at 1.5MG/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
TTHM
Bromoform
Dibromochloromethane
Bromodichloromethane
Copper, Free
Nitrate
Arsenic
TDS
Foamingagents (SURFACTANTS)
Fluoride
Radium-228
Combined Uranium
Gross Alpha Particle Activity
Chromium, Hex
Tetrachloroethylene
Utility SAN GABRIEL COUNTY WDPopulation served 39,345Owner Local government
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: 140 UG/L (ppb)
8/12/2025
Arsenic
Detected: 6.9 UG/L (ppb)
10/29/2025
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: 2.4 PCI/L
4/23/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Chromium, Hex
Detected: 5.6 UG/L (ppb)
1/9/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 5.6 UG/L (ppb)
10/22/2025
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: 1.8 UG/L (ppb)
10/22/2025
Dibromochloromethane
Detected: 1.1 UG/L (ppb)
10/22/2025
Bromodichloromethane
Detected: 1.1 UG/L (ppb)
10/22/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.3 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.
Fluoride
Detected: 1.5 MG/L (ppm)
10/29/2025
Often added deliberately for dental health; can also occur naturally.
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 4.34 PCI/L
1/9/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 2 UG/L (ppb)
10/15/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 240 MG/L (ppm)
10/15/2025
Foamingagents (SURFACTANTS)
Detected: 0.1 MG/L (ppm)
8/6/2025
Radium-228
Detected: 1.62 PCI/L
8/14/2025
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.