What was found in ZIP 19903
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 | 5255 µg/L 53% of the EPA limit 10000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 5190 µg/L 52% of the EPA limit 10000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Fluoride | 1070 µg/L 27% of the EPA limit 4000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Nitrite | 200 µg/L 20% of the EPA limit 1000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Copper | 179.2 µg/L 14% of the EPA limit 1300 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Barium | 67.709 µg/L 3.4% of the EPA limit 2000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| TTHM | 48.35 µg/L 60% of the EPA limit 80 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Lithium | 37.2 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2025 | 1/1 | UCMR-5 |
| Chloroform | 32.235 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 14.815 µg/L 25% of the EPA limit 60 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 9.9145 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 9.69 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Lead | 7.7 µg/L 51% of the EPA limit 15 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 6.339 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Bromate | 6 µg/L 60% of the EPA limit 10 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 5.325 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 5.21 µg/L 104% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Arsenic | 3.783 µg/L 38% of the EPA limit 10 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 3.105 µg/L 0% of the EPA limit 10000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Bromoform | 2.4575 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.4465 µg/L No EPA limit set Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.058 pCi/L 41% of the EPA limit 5 pCi/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Selenium | 1.182 µg/L 2.4% of the EPA limit 50 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Toluene | 1.14 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| 1,2-Dichloroethane | 0.7200 µg/L 14% of the EPA limit 5 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 0.5100 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: DOVER WATER DEPARTMENT · 39,491 people · 2026 | 1/1 | 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 19903
| Supplier | State | Population served |
|---|---|---|
| DOVER WATER DEPARTMENT | DE | 39,491 |
Frequently asked questions about ZIP 19903 tap water
Is the tap water in ZIP 19903 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 19903. 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 19903?
1 public water supplier report EPA drinking-water monitoring for ZIP 19903. Each is listed above with its population served.
What contaminants are in ZIP 19903's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Nitrite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.