Serving roughly 3,693 people in Madera County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CAL AM - OAKHURST
1 water provider directly on file, serving roughly 3,693 people in Madera County, California.
Quick answer: CAL AM - OAKHURST has no violations on file. One reading is worth knowing about: TDS was measured at 582MG/L, among the highest of the 311 providers on file in this area. It's the most notable figure in this system's record among its 311 local peers.
Lead Summary
Lithium
Lead
TTHM
Bromodichloromethane
Dibromochloromethane
Chloroform
Copper, Free
TDS
Combined Uranium
Gross Alpha Particle Activity
Iron
Manganese
Arsenic
Magnesium
Radium-226
Radium-228
Nitrate
Tetrachloroethylene
Utility CAL AM - OAKHURSTPopulation served 3,693Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.005 mg/L (ppm)
12/31/2025
Lead
Detected: 2 UG/L (ppb)
9/24/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 34 UG/L (ppb)
9/16/2025
Combined Uranium
Detected: 11 PCI/L
10/29/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 110 UG/L (ppb)
8/13/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 234 UG/L (ppb)
7/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 3.1 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.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 3.5 UG/L (ppb)
6/9/2025
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.
Bromodichloromethane
Detected: 1.6 UG/L (ppb)
6/9/2025
Dibromochloromethane
Detected: 1.9 UG/L (ppb)
6/9/2025
Chloroform
Detected: 1.1 UG/L (ppb)
6/4/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3.11 MG/L (ppm)
7/16/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 7.7 MG/L (ppm)
10/29/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 15 PCI/L
10/6/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 52 µg/L (ppb)
10/3/2023
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
Tetrachloroethylene
Detected: 1.9 UG/L (ppb)
7/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 582 MG/L (ppm)
9/24/2025
Radium-226
Detected: 2.25 PCI/L
7/14/2025
Radium-228
Detected: 0.376 PCI/L
7/16/2025
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.