Serving roughly 16,180 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for WALNUT PARK MUTUAL WATER CO.
1 water provider directly on file, serving roughly 16,180 people in Los Angeles County, California.
Quick answer: WALNUT PARK MUTUAL WATER CO. has no violations on file and no single reading stands out against its peers (601 other providers in this area). It serves roughly 16,180 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Nitrate
Chromium, Hex
Utility WALNUT PARK MUTUAL WATER CO.Population served 16,180Owner 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)
12/31/2023
Chromium, Hex
Detected: 1.4 UG/L (ppb)
7/14/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 7.1 UG/L (ppb)
2/11/2025
TTHM
Detected: 3.3 UG/L (ppb)
8/12/2025
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: 5.2 UG/L (ppb)
2/11/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 1.8 UG/L (ppb)
8/12/2025
Bromodichloromethane
Detected: 8.5 UG/L (ppb)
2/11/2025
Dibromochloromethane
Detected: 1.5 UG/L (ppb)
8/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 0.43 MG/L (ppm)
7/14/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 3 UG/L (ppb)
2/11/2025
Trichloroaceticacid
Detected: 2.9 UG/L (ppb)
2/11/2025
Dibromoaceticacid
Detected: 1.2 UG/L (ppb)
2/11/2025
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.