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Tap water quality report

ZIP 63390 — Williamstown, MO

EPA monitoring across the 2 water suppliers serving ZIP 63390 in Williamstown, MO detected 24 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
10,690
people served
24
contaminants found

What was found in ZIP 63390

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
7900 µg/L 79%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
1500 µg/L 38%
of the EPA limit 4000 µg/L
 2/2 SYR4
Copper
939 µg/L 72%
of the EPA limit 1300 µg/L
 2/2 SYR4
Barium
67.1 µg/L 3.4%
of the EPA limit 2000 µg/L
 2/2 SYR4
Lithium
62.7 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
24.3 µg/L 162%
of the EPA limit, in the worst sample — 15 µg/L
 2/2 SYR4
TTHM
23.6 µg/L 30%
of the EPA limit 80 µg/L
 2/2 SYR4
Bromodichloromethane
21.8 µg/L
No EPA limit set
 2/2 SYR4
Gross Alpha, Excl. Radon And U
19.7 pCi/L 131%
of the EPA limit, in the worst sample — 15 pCi/L
 1/2 SYR4
Chloroform
15.2 µg/L
No EPA limit set
 2/2 SYR4
Dibromochloromethane
14 µg/L
No EPA limit set
 2/2 SYR4
Chromium
9.51 µg/L 9.5%
of the EPA limit 100 µg/L
 2/2 SYR4
Monobromoacetic Acid
4.79 µg/L
No EPA limit set
 1/2 SYR4
Combined Radium (-226 And -228)
4.1 pCi/L 82%
of the EPA limit 5 pCi/L
 1/2 SYR4
Xylenes, Total
3.54 µg/L 0%
of the EPA limit 10000 µg/L
 1/2 SYR4
Bromoform
3.24 µg/L
No EPA limit set
 2/2 SYR4
Total Haloacetic Acids (HAA5)
3.09 µg/L 5.1%
of the EPA limit 60 µg/L
 1/2 SYR4
Trichloroacetic Acid
2.98 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
2.94 µg/L
No EPA limit set
 1/2 SYR4
2,4-D
2.48 µg/L 3.5%
of the EPA limit 70 µg/L
 1/2 SYR4
Arsenic
2.38 µg/L 24%
of the EPA limit 10 µg/L
 1/2 SYR4
Dibromoacetic Acid
2.07 µg/L
No EPA limit set
 2/2 SYR4
Ethylbenzene
0.8600 µg/L 0.1%
of the EPA limit 700 µg/L
 1/2 SYR4
Lead
0.0022 mg/L 15%
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 63390

SupplierStatePopulation served
CLARK COUNTY CONS PWSD 1 MO 7,140
ST CHARLES CO PWSD #2 WRIGHT CITY MO 3,550

Frequently asked questions about ZIP 63390 tap water

Is the tap water in ZIP 63390 safe to drink?

EPA testing detected 24 contaminants across the water suppliers serving ZIP 63390. 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 63390?

2 public water suppliers report EPA drinking-water monitoring for ZIP 63390. Each is listed above with its population served.

What contaminants are in ZIP 63390's water?

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