MADERA is served by 7 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for MADERA, CA
7 water providers on file serving this city.
Quick answer: MADERA's water has no violations on file and no single reading stands out against its peers (7 other providers in this area). It serves roughly 66,560 people, and the full breakdown below reflects everything EPA and California have on record for it.
Nitrate
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-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)
TTHM
Dibromoaceticacid
Bromoform
Dibromochloromethane
Orthophosphate
Color
Nitrite
Mercury
Nickel
Selenium
Aluminum
Antimony, Total
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 7 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.003 mg/L (ppm)
Found at 2 providers
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: 210 UG/L (ppb)
Found at 3 providers
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 780 UG/L (ppb)
Found at 3 providers
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Chromium, Hex
Detected: 1.1 UG/L (ppb)
Found at 3 providers
Chromium
Detected: 3.3 UG/L (ppb)
Found at 2 providers
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 120 UG/L (ppb)
Found at 2 providers
Arsenic
Detected: 3.9 UG/L (ppb)
Found at 3 providers
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Mercury
Detected: 0.57 UG/L (ppb)
5/5/2025
Nickel
Detected: 1.2 UG/L (ppb)
8/18/2025
Selenium
Detected: 2.7 UG/L (ppb)
4/3/2025
Aluminum
Detected: 12 UG/L (ppb)
8/18/2025
Antimony, Total
Detected: 2.2 UG/L (ppb)
8/18/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 3 UG/L (ppb)
8/11/2025
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.
Bromoform
Detected: 2 UG/L (ppb)
8/11/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
8/11/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 5.6 MG/L (ppm)
Found at 5 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 23 MG/L (ppm)
Found at 2 providers
Sulfate
Detected: 12 MG/L (ppm)
Found at 2 providers
Fluoride
Detected: 0.2 MG/L (ppm)
Found at 2 providers
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 2.6 MG/L (ppm)
10/16/2025
Nitrite
Detected: 0.01 MG/L (ppm)
5/19/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 21 MG/L (ppm)
Found at 2 providers
Potassium
Detected: 6.4 MG/L (ppm)
Found at 2 providers
Sodium
Detected: 39 MG/L (ppm)
Found at 2 providers
Calcium
Detected: 86 MG/L (ppm)
Found at 2 providers
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: 300 MG/L (ppm)
Found at 2 providers
Gross Alpha Particle Activity
Detected: 2.99 PCI/L
Found at 2 providers
pH
Detected: 7.6 PH
Found at 2 providers
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Orthophosphate
Detected: 0.19 MG/L (ppm)
9/5/2025
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)
Found at 2 providers
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)
Found at 2 providers
TDS
Detected: 270 MG/L (ppm)
Found at 2 providers
Foamingagents (SURFACTANTS)
Detected: 0.11 MG/L (ppm)
2/27/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2 NG/L (ppt)
2/5/2025
Turbidity
Detected: 2.2 NTU
Found at 2 providers
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
Found at 2 providers
1, 2-Dibromo-3-Chloropropane
Detected: 0.07 UG/L (ppb)
6/23/2025
Conductivity (at 25°C)
Detected: 360 UMHO/CM
Found at 2 providers
Dibromoaceticacid
Detected: 1 UG/L (ppb)
8/11/2025
Color
Detected: 10 UNITS
8/18/2025
Filtration considerations: General system types, not a specific product recommendation.