What was found in ZIP 20640
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 |
|---|---|---|---|
| Fluoride | 783 µg/L 20% of the EPA limit 4000 µg/L Main supplier: BRYANS ROAD · 6,260 people · 2018
Highest in the ZIP: 1550 µg/L — TOWN OF INDIAN HEAD · 4,100 people · 2018 | 3/3 | SYR4 |
| Nitrate | 1000 µg/L 10% of the EPA limit 10000 µg/L Main supplier: BRYANS ROAD · 6,260 people · 2014 | 2/3 | SYR4 |
| TTHM | 35.5 µg/L 44% of the EPA limit 80 µg/L Main supplier: BRYANS ROAD · 6,260 people · 2019
Highest in the ZIP: 40.74 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 3/3 | SYR4 |
| Barium | 23.95 µg/L 1.2% of the EPA limit 2000 µg/L Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 2/3 | SYR4 |
| Chloroform | 6.875 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2016
Highest in the ZIP: 21.65 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2015 | 3/3 | SYR4 |
| Bromoform | 16 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2016
Highest in the ZIP: 20.32 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2015 | 3/3 | SYR4 |
| Dibromochloromethane | 14.04 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2016
Highest in the ZIP: 17.24 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2015 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.66 pCi/L 44% of the EPA limit 15 pCi/L Main supplier: BRYANS ROAD · 6,260 people · 2015
Highest in the ZIP: 17.055 pCi/L — TOWN OF INDIAN HEAD · 4,100 people · 2019 | 3/3 | SYR4 |
| Lithium | 16.4 µg/L No EPA limit set Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2025 | 1/3 | UCMR-5 |
| Selenium | 13 µg/L 26% of the EPA limit 50 µg/L Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 7.335 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2016
Highest in the ZIP: 11.5 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2015 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3.975 µg/L 6.6% of the EPA limit 60 µg/L Main supplier: BRYANS ROAD · 6,260 people · 2019
Highest in the ZIP: 8.995 µg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 3/3 | SYR4 |
| Toluene | 7.1 µg/L 0.7% of the EPA limit 1000 µg/L Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 6.84 µg/L No EPA limit set Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2014 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 6.255 pCi/L No EPA limit set Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2018 | 2/3 | SYR4 |
| Chromium | 4.685 µg/L 4.7% of the EPA limit 100 µg/L Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 1/3 | SYR4 |
| Dichloromethane | 3.3 µg/L 66% of the EPA limit 5 µg/L Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 1.98 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2015 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.91 pCi/L 38% of the EPA limit 5 pCi/L Highest in the ZIP: TOWN OF INDIAN HEAD · 4,100 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set Highest in the ZIP: NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2014 | 1/3 | SYR4 |
| Trichloroacetic Acid | 1.1 µg/L No EPA limit set Main supplier: BRYANS ROAD · 6,260 people · 2015 | 3/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: BRYANS ROAD · 6,260 people · 2023
Highest in the ZIP: 0.0057 mg/L — NAVAL SUPPORT FACILITY, INDIAN HEAD · 3,321 people · 2025 | 3/3 | 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 20640
| Supplier | State | Population served |
|---|---|---|
| BRYANS ROAD | 6,260 | |
| TOWN OF INDIAN HEAD | MD | 4,100 |
| NAVAL SUPPORT FACILITY, INDIAN HEAD | MD | 3,321 |
Frequently asked questions about ZIP 20640 tap water
Is the tap water in ZIP 20640 safe to drink?
EPA testing detected 22 contaminants across the water suppliers serving ZIP 20640. 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 20640?
3 public water suppliers report EPA drinking-water monitoring for ZIP 20640. Each is listed above with its population served.
What contaminants are in ZIP 20640's water?
EPA monitoring detected Fluoride, Nitrate, TTHM, Barium, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.