What was found in ZIP 20187
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 | 3845.5 µg/L 38% of the EPA limit 10000 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Fluoride | 930 µg/L 23% of the EPA limit 4000 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Copper | 496.6 µg/L 38% of the EPA limit 1300 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 542.8 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Barium | 27.75 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 182.45 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2018 | 2/2 | SYR4 |
| TTHM | 110 µg/L 138% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Chloroform | 92 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Lead | 32.5 µg/L 217% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 79.06 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 37.8 µg/L 63% of the EPA limit 60 µg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Lithium | 34.8 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 1/2 | UCMR-5 |
| Trichloroacetic Acid | 21.05 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 17.8 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 14.5 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.74 pCi/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 10.2 pCi/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 3.54 pCi/L 71% of the EPA limit 5 pCi/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 6.08 pCi/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.575 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 5.63 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 2.81 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019 | 1/2 | SYR4 |
| Toluene | 2.1 µg/L 0.2% of the EPA limit 1000 µg/L Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.02 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.5000 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2019
Highest in the ZIP: 0.9500 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 0.2600 µg/L 0.9% of the EPA limit 30 µg/L Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2015 | 1/2 | SYR4 |
| Heptachlor Epoxide | 0.1800 µg/L 90% of the EPA limit 0.2000 µg/L Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2015 | 1/2 | SYR4 |
| PFOS | 0.0120 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 1/2 | UCMR-5 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2025
Highest in the ZIP: 0.0110 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 2/2 | UCMR-5 |
| Pfhxa | 0.0082 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 1/2 | UCMR-5 |
| PFHXS | 0.0062 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 1/2 | UCMR-5 |
| PFBS | 0.0056 µg/L No EPA limit set Highest in the ZIP: NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 1/2 | UCMR-5 |
| PFOA | 0.0046 µg/L No EPA limit set Main supplier: WARRENTON, TOWN OF · 11,801 people · 2025
Highest in the ZIP: 0.0049 µg/L — NEW BALTIMORE REGIONAL · 8,818 people · 2023 | 2/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WARRENTON, TOWN OF · 11,801 people · 2024
Highest in the ZIP: 0.0027 mg/L — NEW BALTIMORE REGIONAL · 8,818 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 20187
| Supplier | State | Population served |
|---|---|---|
| WARRENTON, TOWN OF | VA | 11,801 |
| NEW BALTIMORE REGIONAL | VA | 8,818 |
Frequently asked questions about ZIP 20187 tap water
Is the tap water in ZIP 20187 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 20187. 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 20187?
2 public water suppliers report EPA drinking-water monitoring for ZIP 20187. Each is listed above with its population served.
What contaminants are in ZIP 20187's water?
EPA monitoring detected Nitrate-Nitrite, Fluoride, Copper, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.