What was found in Ashburn's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 450 µg/L 4.5% of the EPA limit 10000 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2016
Highest in the city: 4100 µg/L — ELYSIAN HEIGHTS · 1,061 people · 2016 | 5/6 | SYR4 |
| Nitrate-Nitrite | 1787.5 µg/L 18% of the EPA limit 10000 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 4089 µg/L — ELYSIAN HEIGHTS · 1,061 people · 2019 | 6/6 | SYR4 |
| Fluoride | 700 µg/L 18% of the EPA limit 4000 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 965 µg/L — SELMA ESTATES · 1,540 people · 2018 | 6/6 | SYR4 |
| Copper | 277.6 µg/L 21% of the EPA limit 1300 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 524 µg/L — CREIGHTON FARMS · 95 people · 2018 | 6/6 | SYR4 |
| Barium | 39.95 µg/L 2% of the EPA limit 2000 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 308.5 µg/L — BEACON HILL-LCSA · 336 people · 2017 | 6/6 | SYR4 |
| TTHM | 63.765 µg/L 80% of the EPA limit 80 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 6/6 | SYR4 |
| Chloroform | 55.03 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 54.6 µg/L 91% of the EPA limit 60 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 5/6 | SYR4 |
| Dichloroacetic Acid | 27.42 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 5/6 | SYR4 |
| Trichloroacetic Acid | 25.765 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 5/6 | SYR4 |
| Xylenes, Total | 20.75 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the city: CREIGHTON FARMS · 95 people · 2019 | 1/6 | SYR4 |
| Lead | 10.775 µg/L 72% of the EPA limit 15 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 19.185 µg/L — SELMA ESTATES · 1,540 people · 2019 | 6/6 | SYR4 |
| Nitrite | 18 µg/L 1.8% of the EPA limit 1000 µg/L Highest in the city: ELYSIAN HEIGHTS · 1,061 people · 2016 | 1/6 | SYR4 |
| Bromodichloromethane | 10.605 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 6/6 | SYR4 |
| Dibromochloromethane | 5.365 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 5.819 µg/L — CREIGHTON FARMS · 95 people · 2017 | 6/6 | SYR4 |
| Gross Beta Particle Activity | 5.0025 pCi/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 3/6 | SYR4 |
| Ethylbenzene | 4.73 µg/L 0.7% of the EPA limit 700 µg/L Highest in the city: CREIGHTON FARMS · 95 people · 2019 | 1/6 | SYR4 |
| Monochloroacetic Acid | 4.265 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 3/6 | SYR4 |
| Arsenic | 3.81 µg/L 38% of the EPA limit 10 µg/L Highest in the city: CREIGHTON FARMS · 95 people · 2018 | 3/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.7 pCi/L 25% of the EPA limit 15 pCi/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 2/6 | SYR4 |
| Selenium | 2.685 µg/L 5.4% of the EPA limit 50 µg/L Highest in the city: RESERVE AT ROKEBY FARM · 284 people · 2017 | 1/6 | SYR4 |
| Combined Uranium | 2.54 µg/L 8.5% of the EPA limit 30 µg/L Highest in the city: ELYSIAN HEIGHTS · 1,061 people · 2014 | 4/6 | SYR4 |
| Dibromoacetic Acid | 2.366 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 4/6 | SYR4 |
| Bromoform | 1.2725 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 2.08 µg/L — BEACON HILL-LCSA · 336 people · 2017 | 5/6 | SYR4 |
| Combined Radium (-226 And -228) | 1.0554 pCi/L 21% of the EPA limit 5 pCi/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019
Highest in the city: 1.32635 pCi/L — SELMA ESTATES · 1,540 people · 2019 | 5/6 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Highest in the city: BEACON HILL-LCSA · 336 people · 2017 | 1/6 | SYR4 |
| Dichloromethane | 0.6300 µg/L 13% of the EPA limit 5 µg/L Highest in the city: SELMA ESTATES · 1,540 people · 2019 | 2/6 | SYR4 |
| Atrazine | 0.3375 µg/L 11% of the EPA limit 3 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 1/6 | SYR4 |
| Simazine | 0.0800 µg/L 2% of the EPA limit 4 µg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2019 | 1/6 | SYR4 |
| Pfpea | 0.0034 µg/L No EPA limit set Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2024 | 1/6 | UCMR-5 |
| Lead | 0.00050 mg/L 3.3% of the EPA limit 0.0150 mg/L Main supplier: LOUDOUN WATER - CENTRAL SYSTEM · 334,808 people · 2026
Highest in the city: 0.0010 mg/L — BEACON HILL-LCSA · 336 people · 2023 | 6/6 | 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
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 level at the main supplier 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.