What was found in Madera's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 2700 µg/L 27% of the EPA limit 10000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 220000 µg/L — MD 46 AHWAHNEE RESORTS · 300 people · 2017 | 5/31 | SYR4 |
| Nitrate | 2959.7 µg/L 30% of the EPA limit 10000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 9040 µg/L — MD 43 MIAMI CREEK KNOLLS · 100 people · 2019 | 23/31 | SYR4 |
| Fluoride | 181 µg/L 4.5% of the EPA limit 4000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 1625 µg/L — MD 05 MOUNTAIN RANCHES · 239 people · 2018 | 25/31 | SYR4 |
| Combined Uranium | 13.2908 µg/L 44% of the EPA limit 30 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 407.306 µg/L — MD 07 MARINA VIEW HEIGHTS · 200 people · 2019 | 13/31 | SYR4 |
| Barium | 177 µg/L 8.9% of the EPA limit 2000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 372.5 µg/L — MADERA CO MD10A-MADERA RANCHOS · 3,172 people · 2019 | 26/31 | SYR4 |
| Total Haloacetic Acids (HAA5) | 204 µg/L 340% of the EPA limit, at the 95th percentile of samples — 60 µg/L Highest in the city: MADERA CO SA16 SUMNER HILL · 135 people · 2019 | 6/31 | SYR4 |
| TTHM | 0.8410 µg/L 1.1% of the EPA limit 80 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 197 µg/L — MADERA CO MD1-HIDDEN LAKE ESTATES · 162 people · 2019 | 10/31 | SYR4 |
| Chloroform | 188 µg/L No EPA limit set Highest in the city: MADERA CO MD1-HIDDEN LAKE ESTATES · 162 people · 2019 | 6/31 | SYR4 |
| Copper | 183.35 µg/L 14% of the EPA limit 1300 µg/L Highest in the city: RIVERSTONE/ROOTCREEK WATER DISTRICT · 5,507 people · 2019 | 17/31 | SYR4 |
| Trichloroacetic Acid | 135 µg/L No EPA limit set Highest in the city: MADERA CO SA16 SUMNER HILL · 135 people · 2019 | 4/31 | SYR4 |
| Arsenic | 8.9 µg/L 89% of the EPA limit 10 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019
Highest in the city: 75.55 µg/L — MD 24 TEAFORD MEADOW LAKES · 150 people · 2019 | 27/31 | SYR4 |
| Dichloroacetic Acid | 70.25 µg/L No EPA limit set Highest in the city: MADERA CO SA16 SUMNER HILL · 135 people · 2019 | 5/31 | SYR4 |
| Lead | 23 µg/L 153% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: MD 33 FAIRMEAD · 568 people · 2018 | 12/31 | SYR4 |
| Dibromochloromethane | 8 µg/L No EPA limit set Highest in the city: MD 05 MOUNTAIN RANCHES · 239 people · 2019 | 8/31 | SYR4 |
| Combined Radium (-226 And -228) | 7.6 pCi/L 152% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Highest in the city: MD 07 MARINA VIEW HEIGHTS · 200 people · 2014 | 7/31 | SYR4 |
| Bromodichloromethane | 7.2 µg/L No EPA limit set Highest in the city: MD 05 MOUNTAIN RANCHES · 239 people · 2019 | 8/31 | SYR4 |
| Monochloroacetic Acid | 5.83 µg/L No EPA limit set Highest in the city: MADERA CO SA16 SUMNER HILL · 135 people · 2019 | 2/31 | SYR4 |
| Chromium | 5.8 µg/L 5.8% of the EPA limit 100 µg/L Highest in the city: MD 33 FAIRMEAD · 568 people · 2018 | 19/31 | SYR4 |
| Bromoform | 5.5 µg/L No EPA limit set Highest in the city: MD 46 AHWAHNEE RESORTS · 300 people · 2018 | 7/31 | SYR4 |
| Dibromoacetic Acid | 4.1 µg/L No EPA limit set Highest in the city: MD 46 AHWAHNEE RESORTS · 300 people · 2018 | 3/31 | SYR4 |
| Toluene | 3.5 µg/L 0.4% of the EPA limit 1000 µg/L Highest in the city: MD 43 MIAMI CREEK KNOLLS · 100 people · 2016 | 3/31 | SYR4 |
| Tetrachloroethylene | 3.02 µg/L 60% of the EPA limit 5 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 1/31 | SYR4 |
| Selenium | 2.2 µg/L 4.4% of the EPA limit 50 µg/L Highest in the city: RIVERSTONE/ROOTCREEK WATER DISTRICT · 5,507 people · 2019 | 4/31 | SYR4 |
| Beryllium, Total | 1.7 µg/L 43% of the EPA limit 4 µg/L Highest in the city: MD 73 QUARTZ MOUNTAIN · 375 people · 2018 | 1/31 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set Highest in the city: MD 46 AHWAHNEE RESORTS · 300 people · 2018 | 3/31 | SYR4 |
| Mercury | 0.8460 µg/L 42% of the EPA limit 2 µg/L Highest in the city: MD 46 AHWAHNEE RESORTS · 300 people · 2017 | 6/31 | SYR4 |
| Nitrite | 0.7000 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: RIVERSTONE/ROOTCREEK WATER DISTRICT · 5,507 people · 2019 | 1/31 | SYR4 |
| Cadmium | 0.3100 µg/L 6.2% of the EPA limit 5 µg/L Highest in the city: MD 40 SUNSET RIDGE ESTATES · 150 people · 2017 | 1/31 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.1300 µg/L 65% of the EPA limit 0.2000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 6/31 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: CITY OF MADERA · 66,560 people · 2025
Highest in the city: 0.0062 mg/L — MD 40 SUNSET RIDGE ESTATES · 150 people · 2023 | 30/31 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Madera
| Supplier | Population served |
|---|---|
| CITY OF MADERA | 66,560 |
| MADERA VALLEY WATER COMPANY | 6,494 |
| RIVERSTONE/ROOTCREEK WATER DISTRICT | 5,507 |
| MADERA CO MD10A-MADERA RANCHOS | 3,172 |
| MADERA CO CSA 22C GUNNER RANCH | 3,050 |
| MADERA CO SA3-PARKSDALE | 1,789 |
| MADERA CO CMD19-PARKWOOD | 1,637 |
| MADERA CO SA1-INDIAN LAKES | 1,562 |
| MD 33 FAIRMEAD | 568 |
| MADERA MH & RV PARK | 450 |
| MD 73 QUARTZ MOUNTAIN | 375 |
| MD 37 LA VINA | 350 |
| MD 46 AHWAHNEE RESORTS | 300 |
| MD 63 MEADOW SPRINGS RANCH | 300 |
| MD 08 NORTH FORK WATER SYSTEM | 264 |
| MD 05 MOUNTAIN RANCHES | 239 |
| MD 07 MARINA VIEW HEIGHTS | 200 |
| MADERA CO MD1-HIDDEN LAKE ESTATES | 162 |
| MD 95 RANCHOS WEST | 150 |
| MD 24 TEAFORD MEADOW LAKES | 150 |
| MD 60 DILLON ESTATES | 150 |
| MD 40 SUNSET RIDGE ESTATES | 150 |
| MADERA CO SA16 SUMNER HILL | 135 |
| SA 14 CHUK CHANSE SUBDIVISION | 100 |
| MD 42 STILL MEADOW | 100 |
| MD 43 MIAMI CREEK KNOLLS | 100 |
| BONADELLE RANCHOS NO. 2 MUTUAL WATER CO | 92 |
| MD 36 EASTIN ARCOLA | 84 |
| MD 58 SIERRA HIGHLANDS | 75 |
| MD 28 RIPPERDAN SELF HELP | 48 |
| MD 85 VALETA | 45 |
Frequently asked questions about Madera tap water
Is Madera tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Madera. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Madera?
31 public water suppliers report drinking-water monitoring for Madera, California to the EPA. Each is listed above with its population served.
What contaminants are in Madera's water?
The contaminants EPA monitoring detected in Madera include Nitrate-Nitrite, Nitrate, Fluoride, Combined Uranium, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.