What was found in ZIP 20657
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 | 4500 µg/L 45% of the EPA limit 10000 µg/L Highest in the ZIP: SOLOMONS · 3,811 people · 2019 | 1/2 | SYR4 |
| Fluoride | 465 µg/L 12% of the EPA limit 4000 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.64 µg/L 34% of the EPA limit 60 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2019 | 2/2 | SYR4 |
| TTHM | 9.64 µg/L 12% of the EPA limit 80 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2019
Highest in the ZIP: 19.705 µg/L — SOLOMONS · 3,811 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 19.51 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017 | 1/2 | SYR4 |
| Dichloroacetic Acid | 14.32 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2014 | 2/2 | SYR4 |
| Arsenic | 10.66 µg/L 107% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 8.9 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2014 | 2/2 | SYR4 |
| Chloroform | 3.625 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017
Highest in the ZIP: 8.17 µg/L — SOLOMONS · 3,811 people · 2016 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 7.26 pCi/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2018 | 2/2 | SYR4 |
| Barium | 5 µg/L 0.3% of the EPA limit 2000 µg/L Highest in the ZIP: SOLOMONS · 3,811 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 2.201 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017
Highest in the ZIP: 3.105 µg/L — SOLOMONS · 3,811 people · 2016 | 2/2 | SYR4 |
| Ethylbenzene | 2.71 µg/L 0.4% of the EPA limit 700 µg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.36 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2014 | 1/2 | SYR4 |
| Monochloroacetic Acid | 1.8 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2014 | 1/2 | SYR4 |
| Dibromochloromethane | 1.708 µg/L No EPA limit set Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2017
Highest in the ZIP: 1.7715 µg/L — SOLOMONS · 3,811 people · 2016 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Highest in the ZIP: SOLOMONS · 3,811 people · 2018 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CHESAPEAKE RANCH ESTATES · 9,500 people · 2023 | 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 20657
| Supplier | State | Population served |
|---|---|---|
| CHESAPEAKE RANCH ESTATES | MD | 9,500 |
| SOLOMONS | MD | 3,811 |
Frequently asked questions about ZIP 20657 tap water
Is the tap water in ZIP 20657 safe to drink?
EPA testing detected 18 contaminants across the water suppliers serving ZIP 20657. 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 20657?
2 public water suppliers report EPA drinking-water monitoring for ZIP 20657. Each is listed above with its population served.
What contaminants are in ZIP 20657's water?
EPA monitoring detected Nitrate, Fluoride, Total Haloacetic Acids (HAA5), TTHM, Xylenes, Total, and others across this ZIP's suppliers. The full list with levels and sources is above.