Tap WaterIndex

← Herndon, VA

Tap water quality report

ZIP 20120 — Herndon, VA

EPA monitoring across the 2 water suppliers serving ZIP 20120 in Herndon, VA detected 33 contaminants. A detection doesn't automatically mean the water is unsafe — see the highest level found below, with the EPA limit for each.

2
water suppliers
1,456,421
people served
33
contaminants found

What was found in ZIP 20120

The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
2520 µg/L 25%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate
2510 µg/L 25%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 2/2 SYR4
Copper
558 µg/L 43%
of the EPA limit 1300 µg/L
 2/2 SYR4
TTHM
104 µg/L 130%
of the EPA limit, in the worst sample — 80 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
93.8 µg/L 156%
of the EPA limit, in the worst sample — 60 µg/L
 2/2 SYR4
Chloroform
92.1 µg/L
No EPA limit set
 2/2 SYR4
Barium
53.2 µg/L 2.7%
of the EPA limit 2000 µg/L
 2/2 SYR4
Trichloroacetic Acid
46.2 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
43.3 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
21.8 µg/L
No EPA limit set
 2/2 SYR4
Lead
20 µg/L 133%
of the EPA limit, in the worst sample — 15 µg/L
 2/2 SYR4
Nitrite
20 µg/L 2%
of the EPA limit 1000 µg/L
 1/2 SYR4
Dibromochloromethane
10.7 µg/L
No EPA limit set
 2/2 SYR4
Bromate
10 µg/L 100%
of the EPA limit 10 µg/L
 1/2 SYR4
Gross Beta Particle Activity
5.99 pCi/L
No EPA limit set
 2/2 SYR4
Monochloroacetic Acid
5.42 µg/L
No EPA limit set
 2/2 SYR4
Gross Alpha, Excl. Radon And U
3.7 pCi/L 25%
of the EPA limit 15 pCi/L
 2/2 SYR4
Dibromoacetic Acid
3.33 µg/L
No EPA limit set
 2/2 SYR4
Bromoform
2.27 µg/L
No EPA limit set
 2/2 SYR4
Combined Radium (-226 And -228)
1.08 pCi/L 22%
of the EPA limit 5 pCi/L
 2/2 SYR4
Atrazine
0.3500 µg/L 12%
of the EPA limit 3 µg/L
 2/2 SYR4
Combined Uranium
0.1120 µg/L 0.4%
of the EPA limit 30 µg/L
 1/2 SYR4
Simazine
0.0800 µg/L 2%
of the EPA limit 4 µg/L
 1/2 SYR4
Pfpea
0.0215 µg/L
No EPA limit set
 2/2 UCMR-5
Pfba
0.0176 µg/L
No EPA limit set
 1/2 UCMR-5
Pfhxa
0.0171 µg/L
No EPA limit set
 1/2 UCMR-5
6:2 Fts
0.0101 µg/L
No EPA limit set
 1/2 UCMR-5
PFBS
0.0081 µg/L
No EPA limit set
 1/2 UCMR-5
PFOA
0.0074 µg/L
No EPA limit set
 1/2 UCMR-5
PFOS
0.0057 µg/L
No EPA limit set
 1/2 UCMR-5
Pfhpa
0.0056 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
0.0012 mg/L 8%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Water suppliers serving ZIP 20120

SupplierStatePopulation served
FAIRFAX COUNTY WATER AUTHORITY VA 1,121,613
LOUDOUN WATER - CENTRAL SYSTEM VA 334,808

Frequently asked questions about ZIP 20120 tap water

Is the tap water in ZIP 20120 safe to drink?

EPA testing detected 33 contaminants across the water suppliers serving ZIP 20120. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 20120?

2 public water suppliers report EPA drinking-water monitoring for ZIP 20120. Each is listed above with its population served.

What contaminants are in ZIP 20120's water?

EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.