Serving roughly 66,560 people in Madera County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF MADERA
1 water provider directly on file, serving roughly 66,560 people in Madera County, California.
Quick answer: CITY OF MADERA has no violations on file. One reading is worth knowing about: Chromium was measured at 3.3UG/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
Lead
Copper, Free
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Foamingagents (SURFACTANTS)
Fluoride
Nitrate
Nitrate-Nitrite
Perfluoropentanoicacid (PFPEA)
Turbidity
Gross Alpha Particle Activity
pH
Odor
Manganese
Iron
1, 2-Dibromo-3-Chloropropane
Chromium, Hex
Tetrachloroethylene
Chromium
Barium
Arsenic
Conductivity (at 25°C)
Utility CITY OF MADERAPopulation served 66,560Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.003 mg/L (ppm)
12/31/2025
Lead
Detected: 0.6 UG/L (ppb)
8/20/2025
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: 346 UG/L (ppb)
8/20/2025
Manganese
Detected: 36 UG/L (ppb)
10/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 780 UG/L (ppb)
2/27/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Chromium, Hex
Detected: 1.1 UG/L (ppb)
10/16/2025
Chromium
Detected: 3.3 UG/L (ppb)
6/23/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 120 UG/L (ppb)
10/16/2025
Arsenic
Detected: 3.8 UG/L (ppb)
6/23/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 23 MG/L (ppm)
10/16/2025
Sulfate
Detected: 12 MG/L (ppm)
10/16/2025
Fluoride
Detected: 0.137 MG/L (ppm)
6/23/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 2.6 MG/L (ppm)
10/16/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 2.6 MG/L (ppm)
10/16/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 9 MG/L (ppm)
10/16/2025
Potassium
Detected: 6.4 MG/L (ppm)
10/16/2025
Sodium
Detected: 28 MG/L (ppm)
10/16/2025
Calcium
Detected: 31 MG/L (ppm)
10/16/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.73 LANG
10/16/2025
Hardness, Total (ASCACO3)
Detected: 110 MG/L (ppm)
10/16/2025
Gross Alpha Particle Activity
Detected: 2.97 PCI/L
8/26/2025
pH
Detected: 7.3 PH
10/16/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 0.93 UG/L (ppb)
6/23/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 120 MG/L (ppm)
10/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.3 AGGR
10/16/2025
Temperature (CENTIGRADE)
Detected: 25 C
6/23/2025
Alkalinity, Total
Detected: 120 MG/L (ppm)
10/16/2025
TDS
Detected: 270 MG/L (ppm)
10/16/2025
Foamingagents (SURFACTANTS)
Detected: 0.11 MG/L (ppm)
2/27/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2 NG/L (ppt)
2/5/2025
Turbidity
Detected: 0.1 NTU
6/23/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
6/23/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.07 UG/L (ppb)
6/23/2025
Conductivity (at 25°C)
Detected: 360 UMHO/CM
10/16/2025
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.