What was found in ZIP 94503
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-Nitrite | 985650 µg/L 9857% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Nitrate | 1511.94 µg/L 15% of the EPA limit 10000 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Fluoride | 234.75 µg/L 5.9% of the EPA limit 4000 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019
Highest in the ZIP: 278.5 µg/L — CITY OF VALLEJO-LAKES SYSTEM · 2,800 people · 2019 | 2/2 | SYR4 |
| TTHM | 112.45 µg/L 141% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Chromium | 89.005 µg/L 89% of the EPA limit 100 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Chloroform | 86.18 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Copper | 74 µg/L 5.7% of the EPA limit 1300 µg/L Highest in the ZIP: CITY OF VALLEJO-LAKES SYSTEM · 2,800 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 59.965 µg/L 100% of the EPA limit 60 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Barium | 53.2 µg/L 2.7% of the EPA limit 2000 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Lead | 47.8 µg/L 319% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 31.1 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 25.28 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 25.04 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 16.49 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 7.534 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 5.7875 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Arsenic | 4.527 µg/L 45% of the EPA limit 10 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019
Highest in the ZIP: 4.91 µg/L — CITY OF VALLEJO-LAKES SYSTEM · 2,800 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.685 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.8 µg/L 63% of the EPA limit 6 µg/L Highest in the ZIP: CITY OF VALLEJO-LAKES SYSTEM · 2,800 people · 2018 | 1/2 | SYR4 |
| Combined Uranium | 2.831 µg/L 9.4% of the EPA limit 30 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 2/2 | SYR4 |
| Cadmium | 2.19 µg/L 44% of the EPA limit 5 µg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Bromoform | 1.9 µg/L No EPA limit set Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 0.9700 µg/L 19% of the EPA limit 5 µg/L Highest in the ZIP: CITY OF VALLEJO-LAKES SYSTEM · 2,800 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: AMERICAN CANYON, CITY OF · 21,437 people · 2024 | 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 94503
| Supplier | State | Population served |
|---|---|---|
| AMERICAN CANYON, CITY OF | CA | 21,437 |
| CITY OF VALLEJO-LAKES SYSTEM | CA | 2,800 |
Frequently asked questions about ZIP 94503 tap water
Is the tap water in ZIP 94503 safe to drink?
EPA testing detected 24 contaminants across the water suppliers serving ZIP 94503. 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 94503?
2 public water suppliers report EPA drinking-water monitoring for ZIP 94503. Each is listed above with its population served.
What contaminants are in ZIP 94503's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, TTHM, Chromium, and others across this ZIP's suppliers. The full list with levels and sources is above.