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Tap water quality report

Arlington, VA

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Arlington. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
216,352
people served
15
contaminants found
Virginia rankings Lead in Virginia PFAS in Virginia

What was found in Arlington'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.

ContaminantLevel vs EPA limitSuppliersSource
Copper
91.93 µg/L 7.1%
of the EPA limit 1300 µg/L
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
TTHM
69 µg/L 86%
of the EPA limit 80 µg/L
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
Highest in the city: 71.35 µg/L — ARLINGTON COUNTY - WILLSTON AREA · 1,352 people · 2019
2/2 SYR4
Chloroform
51 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
Highest in the city: 53.8 µg/L — ARLINGTON COUNTY - WILLSTON AREA · 1,352 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
45 µg/L 75%
of the EPA limit 60 µg/L
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Dichloroacetic Acid
22.56 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
Highest in the city: 23.835 µg/L — ARLINGTON COUNTY - WILLSTON AREA · 1,352 people · 2019
2/2 SYR4
Trichloroacetic Acid
20.68 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Bromodichloromethane
18.4 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Dibromochloromethane
5.525 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
Highest in the city: 5.83 µg/L — ARLINGTON COUNTY - WILLSTON AREA · 1,352 people · 2019
2/2 SYR4
Lead
3.0905 µg/L 21%
of the EPA limit 15 µg/L
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Monochloroacetic Acid
2.9 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.7 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
2/2 SYR4
Bromoform
0.5000 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2019
Highest in the city: 0.7000 µg/L — ARLINGTON COUNTY - WILLSTON AREA · 1,352 people · 2019
2/2 SYR4
Pfpea
0.0045 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2024
1/2 UCMR-5
Pfhxa
0.0033 µg/L
No EPA limit set
Main supplier: ARLINGTON COUNTY · 215,000 people · 2024
1/2 UCMR-5
Lead
0.00060 mg/L 4%
of the EPA limit 0.0150 mg/L
Main supplier: ARLINGTON COUNTY · 215,000 people · 2025
2/2 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 Arlington

SupplierPopulation served
ARLINGTON COUNTY 215,000
ARLINGTON COUNTY - WILLSTON AREA 1,352

Frequently asked questions about Arlington tap water

Is Arlington tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Arlington. 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 Arlington?

2 public water suppliers report drinking-water monitoring for Arlington, Virginia to the EPA. Each is listed above with its population served.

What contaminants are in Arlington's water?

The contaminants EPA monitoring detected in Arlington include Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Dichloroacetic Acid. 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.