Serving roughly 10,070 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 VALLEY WATER CO.
1 water provider directly on file, serving roughly 10,070 people in Los Angeles County, California.
Quick answer: VALLEY WATER CO. has no violations on file. One reading is worth knowing about: Chloride was measured at 100MG/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
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Nitrate
Perchlorate
TDS
Sulfate
Chloride
Methylethylketone
Trichloroethylene
Tetrachloroethylene
Utility VALLEY WATER CO.Population served 10,070Owner 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)
12/31/2022
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 4.8 UG/L (ppb)
8/5/2025
TTHM
Detected: 1.1 UG/L (ppb)
10/8/2025
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: 1.1 UG/L (ppb)
10/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 2.1 UG/L (ppb)
8/5/2025
Bromodichloromethane
Detected: 9.9 UG/L (ppb)
8/5/2025
Dibromochloromethane
Detected: 9.7 UG/L (ppb)
8/5/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3.4 MG/L (ppm)
10/20/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 140 MG/L (ppm)
7/2/2025
Chloride
Detected: 100 MG/L (ppm)
7/2/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 34.6 µg/L (ppb)
5/15/2024
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
Trichloroethylene
Detected: 0.87 UG/L (ppb)
10/8/2025
Tetrachloroethylene
Detected: 1.5 UG/L (ppb)
10/8/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.9 UG/L (ppb)
8/5/2025
Trichloroaceticacid
Detected: 1.6 UG/L (ppb)
8/5/2025
Dibromoaceticacid
Detected: 1.3 UG/L (ppb)
8/5/2025
Perchlorate
Detected: 1.5 UG/L (ppb)
10/20/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
TDS
Detected: 650 MG/L (ppm)
7/2/2025
Methylethylketone
Detected: 11 UG/L (ppb)
10/8/2025
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.