Serving roughly 15,948 people in Orange County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for CITY OF LA PALMA
1 water provider directly on file, serving roughly 15,948 people in Orange County, California.
Quick answer: CITY OF LA PALMA has no violations on file. One reading is worth knowing about: Arsenic was measured at 8.4UG/L, among the highest of the 167 providers on file in this area. It's the most notable figure in this system's record among its 167 local peers.
Lead Summary
Lithium
Fluoride
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Trichloroaceticacid
Dibromoaceticacid
Dichloroaceticacid
Arsenic
Calcium
Alkalinity, Total
Turbidity
pH
Odor
Manganese
Iron
Utility CITY OF LA PALMAPopulation served 15,948Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0041 mg/L (ppm)
12/31/2024
Arsenic
Detected: 8.4 UG/L (ppb)
9/8/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Manganese
Detected: 57 UG/L (ppb)
9/2/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 84 UG/L (ppb)
9/2/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 1.62 UG/L (ppb)
8/4/2025
TTHM
Detected: 3.97 UG/L (ppb)
8/4/2025
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)
8/4/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 0.65 UG/L (ppb)
8/4/2025
Bromodichloromethane
Detected: 1.18 UG/L (ppb)
8/4/2025
Dibromochloromethane
Detected: 1.04 UG/L (ppb)
8/4/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 0.485 MG/L (ppm)
9/2/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Calcium
Detected: 40.5 MG/L (ppm)
4/1/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH
Detected: 8 PH
4/1/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 31.2009 µg/L (ppb)
12/6/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Other
Additional substances tested that don't fit neatly into the categories above
Trichloroaceticacid
Detected: 1.82 UG/L (ppb)
8/4/2025
Dibromoaceticacid
Detected: 1.62 UG/L (ppb)
8/4/2025
Dichloroaceticacid
Detected: 4.13 UG/L (ppb)
8/4/2025
Alkalinity, Total
Detected: 179 MG/L (ppm)
4/1/2025
Turbidity
Detected: 0.15 NTU
2/3/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
2/3/2025
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.