What was found in Ashburn's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 4100 µg/L 41% of the EPA limit 10000 µg/L | 5/6 | SYR4 |
| Nitrate-Nitrite | 4100 µg/L 41% of the EPA limit 10000 µg/L | 6/6 | SYR4 |
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L | 6/6 | SYR4 |
| Copper | 860 µg/L 66% of the EPA limit 1300 µg/L | 6/6 | SYR4 |
| Barium | 310 µg/L 16% of the EPA limit 2000 µg/L | 6/6 | SYR4 |
| TTHM | 102 µg/L 127% of the EPA limit, in the worst sample — 80 µg/L | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 93.8 µg/L 156% of the EPA limit, in the worst sample — 60 µg/L | 5/6 | SYR4 |
| Chloroform | 92.1 µg/L No EPA limit set | 6/6 | SYR4 |
| Trichloroacetic Acid | 46.2 µg/L No EPA limit set | 5/6 | SYR4 |
| Dichloroacetic Acid | 43.3 µg/L No EPA limit set | 5/6 | SYR4 |
| Lead | 32 µg/L 213% of the EPA limit, in the worst sample — 15 µg/L | 6/6 | SYR4 |
| Xylenes, Total | 22 µg/L 0.2% of the EPA limit 10000 µg/L | 1/6 | SYR4 |
| Nitrite | 18 µg/L 1.8% of the EPA limit 1000 µg/L | 1/6 | SYR4 |
| Bromodichloromethane | 13.9 µg/L No EPA limit set | 6/6 | SYR4 |
| Dibromochloromethane | 10.7 µg/L No EPA limit set | 6/6 | SYR4 |
| Monochloroacetic Acid | 5.42 µg/L No EPA limit set | 3/6 | SYR4 |
| Gross Beta Particle Activity | 5.4 pCi/L No EPA limit set | 3/6 | SYR4 |
| Ethylbenzene | 4.8 µg/L 0.7% of the EPA limit 700 µg/L | 1/6 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L | 3/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.7 pCi/L 25% of the EPA limit 15 pCi/L | 2/6 | SYR4 |
| Dibromoacetic Acid | 3.33 µg/L No EPA limit set | 4/6 | SYR4 |
| Selenium | 2.7 µg/L 5.4% of the EPA limit 50 µg/L | 1/6 | SYR4 |
| Combined Uranium | 2.54 µg/L 8.5% of the EPA limit 30 µg/L | 4/6 | SYR4 |
| Bromoform | 2.27 µg/L No EPA limit set | 5/6 | SYR4 |
| Combined Radium (-226 And -228) | 1.38 pCi/L 28% of the EPA limit 5 pCi/L | 5/6 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set | 1/6 | SYR4 |
| Dichloromethane | 0.6300 µg/L 13% of the EPA limit 5 µg/L | 2/6 | SYR4 |
| Atrazine | 0.3500 µg/L 12% of the EPA limit 3 µg/L | 1/6 | SYR4 |
| Simazine | 0.0800 µg/L 2% of the EPA limit 4 µg/L | 1/6 | SYR4 |
| Pfpea | 0.0034 µg/L No EPA limit set | 1/6 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L | 6/6 | LCR |
Water suppliers serving Ashburn
| Supplier | Population served |
|---|---|
| LOUDOUN WATER - CENTRAL SYSTEM | 334,808 |
| SELMA ESTATES | 1,540 |
| ELYSIAN HEIGHTS | 1,061 |
| BEACON HILL-LCSA | 336 |
| RESERVE AT ROKEBY FARM | 284 |
| CREIGHTON FARMS | 95 |
Frequently asked questions about Ashburn tap water
Is Ashburn tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Ashburn. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Ashburn?
6 public water suppliers report drinking-water monitoring for Ashburn, Virginia to the EPA. Each is listed above with its population served.
What contaminants are in Ashburn's water?
The contaminants EPA monitoring detected in Ashburn include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. The full list, with the highest level found and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.