Tap Water Quality Report
Tap water quality in ARLINGTON, Virginia
Tap water in ARLINGTON, Virginia receives a grade of D (63/100) from TapWaterSafety.org. It's served by ARLINGTON COUNTY. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in ARLINGTON's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving ARLINGTON.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 42.7 ppb, 711x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 34.8 ppb, 348x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 50.8 ppb, 339x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.109 ppb.
Recommended filters for ARLINGTON
Filters matched to the specific contaminants in ARLINGTON's water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
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 ARLINGTON'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 |
42.7 ppb | 0.06 | — | — | — | — | — | 711× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
34.8 ppb | 0.1 | 60.0 | 60 | — | — | — | 348× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
50.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 339× over |
| Bromodichloromethane Disinfection byproduct |
11.7 ppb | 0.06 | — | — | — | — | — | 195× over |
| Trichloroacetic acid Disinfection byproduct |
16.8 ppb | 0.1 | — | — | — | — | — | 168× over |
| Bromochloroacetic acid Disinfection byproduct |
3.24 ppb | 0.02 | — | — | — | — | — | 162× over |
| Chloroform Disinfection byproduct |
36.4 ppb | 0.4 | — | — | — | — | — | 91× over |
| Dichloroacetic acid Disinfection byproduct |
16.2 ppb | 0.2 | — | — | — | — | — | 81× over |
| Arsenic* Heavy metal |
0.109 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 27× over |
| Dibromochloromethane Disinfection byproduct |
2.72 ppb | 0.1 | — | — | — | — | — | 27× over |
| Nitrate* Inorganic |
1.09 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 7.8× over |
| Radium, combined (-226 and -228)* Radiological |
0.38 pCi/L | 0.05 | 5.0 | — | — | — | — | 7.6× over |
| Chromium (hexavalent) Heavy metal |
0.0918 ppb | 0.02 | — | — | — | — | — | 4.6× over |
| Dibromoacetic acid Disinfection byproduct |
0.0958 ppb | 0.03 | — | — | — | — | — | 3.2× over |
| Chlorate Disinfection byproduct |
282.5 ppb | 210.0 | — | — | — | — | — | 1.3× over |
| Atrazine* Pesticide/Herbicide |
0.0279 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Perchlorate* Disinfection byproduct |
0.249 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Tritium* Other |
83.7 pCi/L | 400.0 | — | — | — | — | — | Below guideline |
| Aluminum* Heavy metal |
39.2 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Barium* Heavy metal |
36.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Simazine* Pesticide/Herbicide |
0.00458 ppb | 0.1 | 4.0 | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
1.65 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.391 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromoform* Disinfection byproduct |
0.00857 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.4 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.853 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.109 ppb | 25.0 | — | — | — | — | — | Below guideline |
| 2,4-D* Pesticide/Herbicide |
0.0348 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.5 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.1 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.193 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Dalapon* Pesticide/Herbicide |
0.104 ppb | — | 200.0 | — | — | — | — | Below guideline |
| Diethyl phthalate* Semi-volatile organic compound |
0.188 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.657 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium* Other |
1.76 ppb | — | — | — | — | — | — | Below guideline |
| Metolachlor* Pesticide/Herbicide |
0.0175 ppb | — | — | — | — | — | — | Below guideline |
| Uranium* Radiological |
0.0 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 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 ARLINGTON COUNTY.