What was found in ZIP 93638
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| 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 ZIP: 4294 µg/L — MADERA VALLEY WATER COMPANY · 6,494 people · 2019 | 2/2 | SYR4 |
| 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 ZIP: 3800 µg/L — MADERA VALLEY WATER COMPANY · 6,494 people · 2019 | 2/2 | 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 ZIP: 206 µg/L — MADERA VALLEY WATER COMPANY · 6,494 people · 2019 | 2/2 | SYR4 |
| Barium | 177 µg/L 8.9% of the EPA limit 2000 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 2/2 | SYR4 |
| Copper | 140 µg/L 11% of the EPA limit 1300 µg/L Highest in the ZIP: MADERA VALLEY WATER COMPANY · 6,494 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 13.2908 µg/L 44% of the EPA limit 30 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 1/2 | SYR4 |
| Arsenic | 8.9 µg/L 89% of the EPA limit 10 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 3.02 µg/L 60% of the EPA limit 5 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 1/2 | SYR4 |
| TTHM | 0.8410 µg/L 1.1% of the EPA limit 80 µg/L Main supplier: CITY OF MADERA · 66,560 people · 2019 | 1/2 | 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 | 1/2 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: CITY OF MADERA · 66,560 people · 2025 | 2/2 | 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.
Water suppliers serving ZIP 93638
| Supplier | State | Population served |
|---|---|---|
| CITY OF MADERA | CA | 66,560 |
| MADERA VALLEY WATER COMPANY | CA | 6,494 |
Frequently asked questions about ZIP 93638 tap water
Is the tap water in ZIP 93638 safe to drink?
EPA testing detected 11 contaminants across the water suppliers serving ZIP 93638. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 93638?
2 public water suppliers report EPA drinking-water monitoring for ZIP 93638. Each is listed above with its population served.
What contaminants are in ZIP 93638's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.