What was found in ZIP 20191
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 2520 µg/L 25% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Nitrate | 2510 µg/L 25% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Fluoride | 800 µg/L 20% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Copper | 558 µg/L 43% of the EPA limit 1300 µg/L | 1/1 | SYR4 |
| TTHM | 104 µg/L 130% of the EPA limit, in the worst sample — 80 µg/L | 1/1 | SYR4 |
| Chloroform | 86.4 µg/L No EPA limit set | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 60.5 µg/L 101% of the EPA limit, in the worst sample — 60 µg/L | 1/1 | SYR4 |
| Barium | 53.2 µg/L 2.7% of the EPA limit 2000 µg/L | 1/1 | SYR4 |
| Dichloroacetic Acid | 33.2 µg/L No EPA limit set | 1/1 | SYR4 |
| Trichloroacetic Acid | 26.2 µg/L No EPA limit set | 1/1 | SYR4 |
| Bromodichloromethane | 21.8 µg/L No EPA limit set | 1/1 | SYR4 |
| Nitrite | 20 µg/L 2% of the EPA limit 1000 µg/L | 1/1 | SYR4 |
| Bromate | 10 µg/L 100% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| Dibromochloromethane | 8.84 µg/L No EPA limit set | 1/1 | SYR4 |
| Gross Beta Particle Activity | 5.99 pCi/L No EPA limit set | 1/1 | SYR4 |
| Monochloroacetic Acid | 4 µg/L No EPA limit set | 1/1 | SYR4 |
| Dibromoacetic Acid | 3.13 µg/L No EPA limit set | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.01 pCi/L 20% of the EPA limit 15 pCi/L | 1/1 | SYR4 |
| Lead | 2.4 µg/L 16% of the EPA limit 15 µg/L | 1/1 | SYR4 |
| Bromoform | 1.67 µg/L No EPA limit set | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.6910 pCi/L 14% of the EPA limit 5 pCi/L | 1/1 | SYR4 |
| Combined Uranium | 0.1120 µg/L 0.4% of the EPA limit 30 µg/L | 1/1 | SYR4 |
| Atrazine | 0.0900 µg/L 3% of the EPA limit 3 µg/L | 1/1 | SYR4 |
| Pfpea | 0.0215 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfba | 0.0176 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfhxa | 0.0171 µg/L No EPA limit set | 1/1 | UCMR-5 |
| 6:2 Fts | 0.0101 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFBS | 0.0081 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFOA | 0.0074 µg/L No EPA limit set | 1/1 | UCMR-5 |
| PFOS | 0.0057 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Pfhpa | 0.0056 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Lead | 0.0012 mg/L 8% of the EPA limit 0.0150 mg/L | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 20191
| Supplier | State | Population served |
|---|---|---|
| FAIRFAX COUNTY WATER AUTHORITY | VA | 1,121,613 |
Frequently asked questions about ZIP 20191 tap water
Is the tap water in ZIP 20191 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 20191. 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 20191?
1 public water supplier report EPA drinking-water monitoring for ZIP 20191. Each is listed above with its population served.
What contaminants are in ZIP 20191's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.