← Williamstown, MO

Tap water quality report

ZIP 63440 — Williamstown, MO

EPA monitoring across the 3 water suppliers serving ZIP 63440 in Williamstown, MO detected 20 contaminants. A detection doesn't automatically mean the water is unsafe — see the highest level found below, with the EPA limit for each.

3
water suppliers
15,987
people served
20
contaminants found

What was found in ZIP 63440

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
1/3 SYR4
Copper
1030 µg/L 79%
of the EPA limit 1300 µg/L
3/3 SYR4
Fluoride
130 µg/L 3.3%
of the EPA limit 4000 µg/L
1/3 SYR4
TTHM
83.7 µg/L 105%
of the EPA limit, in the worst sample — 80 µg/L
3/3 SYR4
Chloroform
69.5 µg/L
No EPA limit set
3/3 SYR4
Barium
54.2 µg/L 2.7%
of the EPA limit 2000 µg/L
1/3 SYR4
Total Haloacetic Acids (HAA5)
54 µg/L 90%
of the EPA limit 60 µg/L
2/3 SYR4
Lithium
47 µg/L
No EPA limit set
2/3 UCMR-5
Dichloroacetic Acid
34.4 µg/L
No EPA limit set
3/3 SYR4
Trichloroacetic Acid
20.7 µg/L
No EPA limit set
3/3 SYR4
Bromodichloromethane
17.7 µg/L
No EPA limit set
3/3 SYR4
Dibromochloromethane
11.7 µg/L
No EPA limit set
3/3 SYR4
Monobromoacetic Acid
11.4 µg/L
No EPA limit set
3/3 SYR4
Lead
8.74 µg/L 58%
of the EPA limit 15 µg/L
3/3 SYR4
Monochloroacetic Acid
4.13 µg/L
No EPA limit set
1/3 SYR4
Dibromoacetic Acid
3.7 µg/L
No EPA limit set
3/3 SYR4
Chromium
3.01 µg/L 3%
of the EPA limit 100 µg/L
1/3 SYR4
Bromoform
2.16 µg/L
No EPA limit set
2/3 SYR4
Pfba
0.0110 µg/L
No EPA limit set
2/3 UCMR-5
Lead
0.0029 mg/L 19%
of the EPA limit 0.0150 mg/L
3/3 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 63440

SupplierStatePopulation served
CLARK COUNTY CONS PWSD 1 MO 7,140
MARION COUNTY PWSD 1 MO 4,900
KNOX COUNTY PUBLIC WATER & SEWER DIST 1 MO 3,947

Frequently asked questions about ZIP 63440 tap water

Is the tap water in ZIP 63440 safe to drink?

EPA testing detected 20 contaminants across the water suppliers serving ZIP 63440. 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 63440?

3 public water suppliers report EPA drinking-water monitoring for ZIP 63440. Each is listed above with its population served.

What contaminants are in ZIP 63440's water?

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