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Wentzville, MO

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Wentzville. 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
41,919
people served
21
contaminants found
Missouri rankings Lead in Missouri PFAS in Missouri

What was found in Wentzville'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
Fluoride
790 µg/L 20%
of the EPA limit 4000 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2017
2/2 SYR4
Copper
201 µg/L 15%
of the EPA limit 1300 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2018
Highest in the city: 403.1499999999997 µg/L — PRAIRIE VIEW ACRES SUBD · 135 people · 2019
2/2 SYR4
Barium
32.7 µg/L 1.6%
of the EPA limit 2000 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2017
Highest in the city: 52.974999999999994 µg/L — PRAIRIE VIEW ACRES SUBD · 135 people · 2017
2/2 SYR4
Lithium
48.4 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2024
1/2 UCMR-5
TTHM
42.815 µg/L 54%
of the EPA limit 80 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
32.43999999999999 µg/L 54%
of the EPA limit 60 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Chloroform
30.17999999999999 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Dichloroacetic Acid
23.840000000000014 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Nitrate-Nitrite
14 µg/L 0.1%
of the EPA limit 10000 µg/L
Highest in the city: PRAIRIE VIEW ACRES SUBD · 135 people · 2019
1/2 SYR4
Monochloroacetic Acid
10.785 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Bromodichloromethane
10.029999999999998 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Chromium
2.6134999999999997 µg/L 2.6%
of the EPA limit 100 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2017
Highest in the city: 9.770499999999998 µg/L — PRAIRIE VIEW ACRES SUBD · 135 people · 2017
2/2 SYR4
Monobromoacetic Acid
7.083999999999999 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Lead
6.121499999999999 µg/L 41%
of the EPA limit 15 µg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2018
2/2 SYR4
Dibromochloromethane
5.0825000000000005 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Trichloroacetic Acid
4.7725 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
3.9199999999999995 pCi/L 78%
of the EPA limit 5 pCi/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2018
2/2 SYR4
Dibromoacetic Acid
2.0965 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Arsenic
1.87 µg/L 19%
of the EPA limit 10 µg/L
Highest in the city: PRAIRIE VIEW ACRES SUBD · 135 people · 2017
1/2 SYR4
Bromoform
0.7505 µg/L
No EPA limit set
Main supplier: WENTZVILLE PWS · 41,784 people · 2019
1/2 SYR4
Lead
0.0048 mg/L 32%
of the EPA limit 0.0150 mg/L
Main supplier: WENTZVILLE PWS · 41,784 people · 2024
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 Wentzville

SupplierPopulation served
WENTZVILLE PWS 41,784
PRAIRIE VIEW ACRES SUBD 135

Frequently asked questions about Wentzville tap water

Is Wentzville tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Wentzville. 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 Wentzville?

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

What contaminants are in Wentzville's water?

The contaminants EPA monitoring detected in Wentzville include Fluoride, Copper, Barium, Lithium, TTHM. 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.