Tap Water Quality Report
Tap water quality in ASHBURN, Virginia
Tap water in ASHBURN, Virginia receives a grade of C (72/100) from TapWaterSafety.org. It's served by LOUDOUN WATER - CENTRAL SYSTEM. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in ASHBURN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving ASHBURN.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 15.3 ppb, 255x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 28.5 ppb, 190x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 14.2 ppb, 142x above the EWG health guideline of 0.1 ppb.
EPA compliance record
Official U.S. EPA records for LOUDOUN WATER - CENTRAL SYSTEM (system ID VA6107350) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Lead and Copper Rule | Missed testing or reporting | 10/01/2023 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for ASHBURN
Filters matched to the specific contaminants in ASHBURN's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in ASHBURN's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
15.3 ppb | 0.06 | — | — | — | — | — | 255× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
28.5 ppb | 0.15 | 80.0 | 100 | — | — | — | 190× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
14.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 142× over |
| Bromodichloromethane Disinfection byproduct |
6.8 ppb | 0.06 | — | — | — | — | — | 113× over |
| Trichloroacetic acid Disinfection byproduct |
5.67 ppb | 0.1 | — | — | — | — | — | 57× over |
| Chloroform Disinfection byproduct |
18.2 ppb | 0.4 | — | — | — | — | — | 45× over |
| Dichloroacetic acid Disinfection byproduct |
7.75 ppb | 0.2 | — | — | — | — | — | 39× over |
| Dibromochloromethane Disinfection byproduct |
3.3 ppb | 0.1 | — | — | — | — | — | 33× over |
| Dibromoacetic acid Disinfection byproduct |
0.495 ppb | 0.03 | — | — | — | — | — | 17× over |
| Nitrate and nitrite Inorganic |
1.36 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 9.7× over |
| Chromium (hexavalent) Heavy metal |
0.116 ppb | 0.02 | — | — | — | — | — | 5.8× over |
| Radium, combined (-226 and -228) Radiological |
0.23 pCi/L | 0.05 | 5.0 | — | — | — | — | 4.6× over |
| Bromate Disinfection byproduct |
0.351 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 3.5× over |
| Bromoform Disinfection byproduct |
0.259 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
95.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
43.3 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Barium Heavy metal |
40.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
2.13 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.146 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.286 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.359 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.425 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.116 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.3 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.635 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from LOUDOUN WATER - CENTRAL SYSTEM.