Serving roughly 22,968 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for EL MONTE-CITY, WATER DEPT.
1 water provider directly on file, serving roughly 22,968 people in Los Angeles County, California.
Quick answer: EL MONTE-CITY, WATER DEPT. has no violations on file. One reading is worth knowing about: Trichloroethylene was measured at 18UG/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
Dibromoaceticacid
Dibromochloromethane
Chloromethane
Trichloroethylene
Tetrachloroethylene
1, 1-Dichloroethylene
Cis-1, 2-Dichloroethylene
Langelier Index (Source Temp.)
Magnesium
Calcium
Potassium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
Foamingagents (SURFACTANTS)
TDS
Sulfate
Chloride
Fluoride
Utility EL MONTE-CITY, WATER DEPT.Population served 22,968Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2026
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Dibromochloromethane
Detected: 1 UG/L (ppb)
7/30/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 41 MG/L (ppm)
9/2/2025
Chloride
Detected: 17 MG/L (ppm)
9/2/2025
Fluoride
Detected: 0.35 MG/L (ppm)
6/3/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 20 MG/L (ppm)
9/2/2025
Calcium
Detected: 80 MG/L (ppm)
9/2/2025
Potassium
Detected: 2.1 MG/L (ppm)
9/2/2025
Sodium
Detected: 18 MG/L (ppm)
9/2/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 280 MG/L (ppm)
9/2/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOS
Detected: 0.0044 µg/L (ppb)
3/28/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0032 µg/L (ppb)
3/28/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Chloromethane
Detected: 0.57 UG/L (ppb)
7/15/2025
Trichloroethylene
Detected: 18 UG/L (ppb)
9/22/2025
Tetrachloroethylene
Detected: 7.1 UG/L (ppb)
9/22/2025
1, 1-Dichloroethylene
Detected: 0.91 UG/L (ppb)
9/22/2025
Cis-1, 2-Dichloroethylene
Detected: 0.52 UG/L (ppb)
4/22/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 270 MG/L (ppm)
9/2/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 1 UG/L (ppb)
4/29/2025
Langelier Index (Source Temp.)
Detected: 0.17 LANG
9/2/2025
Alkalinity, Total
Detected: 220 MG/L (ppm)
9/2/2025
Foamingagents (SURFACTANTS)
Detected: 0.05 MG/L (ppm)
9/2/2025
TDS
Detected: 370 MG/L (ppm)
9/2/2025
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.