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Tap water quality report

Wentzville

EPA monitoring tested this supplier for 100 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

100
contaminants tested
19
detected
41,784
people served
8
health-based violations
Missouri rankingsLead in MissouriPFAS in Missouri
Water source
Ground water
Ownership
Local government
Counties served
St. Charles

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

8
health-based violations
19
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2007-09-01 → 2007-09-30
MCL Health-based Resolved 2007-09-01 → 2007-09-30
MCL Health-based Resolved 2007-09-01 → 2007-09-30
MCL Health-based Resolved 2007-09-01 → 2007-09-30
MCL Health-based Resolved 2005-06-01 → 2005-06-30
MCL Health-based Resolved 2005-06-01 → 2005-06-30
MCL Health-based Resolved 2005-06-01 → 2005-06-30
MCL Health-based Resolved 2005-06-01 → 2005-06-30
RPT Monitoring Unaddressed 2025-07-02
MON Monitoring Resolved 2018-08-01 → 2018-08-31

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
201 µg/L 15%
of the EPA limit 1300 µg/L
worst single sample: 244 µg/L
91/91 SYR4 2012–2018
Bromodichloromethane
10.03 µg/L
No EPA limit set
worst single sample: 17 µg/L
78/79 SYR4 2012–2019
Chloroform
30.18 µg/L
No EPA limit set
worst single sample: 44.3 µg/L
78/79 SYR4 2012–2019
TTHM
42.815 µg/L 54%
of the EPA limit 80 µg/L
worst single sample: 60.5 µg/L
78/78 SYR4 2012–2019
Dichloroacetic Acid
23.84 µg/L
No EPA limit set
worst single sample: 31.4 µg/L
77/78 SYR4 2012–2019
Trichloroacetic Acid
4.7725 µg/L
No EPA limit set
worst single sample: 5.8 µg/L
76/78 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
32.44 µg/L 54%
of the EPA limit 60 µg/L
worst single sample: 35.5 µg/L
73/78 SYR4 2012–2019
Dibromochloromethane
5.0825 µg/L
No EPA limit set
worst single sample: 6.43 µg/L
72/79 SYR4 2012–2019
Lead
0.0048 mg/L 32%
of the EPA limit 0.0150 mg/L
 26/26 LCR 2024
Dibromoacetic Acid
2.0965 µg/L
No EPA limit set
worst single sample: 2.38 µg/L
22/78 SYR4 2012–2019
Bromoform
0.7505 µg/L
No EPA limit set
worst single sample: 0.7600 µg/L
20/79 SYR4 2012–2019
Monobromoacetic Acid
7.084 µg/L
No EPA limit set
worst single sample: 7.48 µg/L
19/78 SYR4 2012–2019
Lead
6.1215 µg/L 41%
of the EPA limit 15 µg/L
worst single sample: 6.38 µg/L
12/91 SYR4 2012–2018
Chromium
2.6135 µg/L 2.6%
of the EPA limit 100 µg/L
worst single sample: 2.89 µg/L
8/9 SYR4 2013–2017
Lithium
48.4 µg/L
No EPA limit set
 8/8 UCMR-5 2024
Combined Radium (-226 And -228)
3.92 pCi/L 78%
of the EPA limit 5 pCi/L
worst single sample: 4.1 pCi/L
5/5 SYR4 2017–2018
Monochloroacetic Acid
10.785 µg/L
No EPA limit set
worst single sample: 10.8 µg/L
4/78 SYR4 2012–2019
Barium
32.7 µg/L 1.6%
of the EPA limit 2000 µg/L
 1/1 SYR4 2017
Fluoride
790 µg/L 20%
of the EPA limit 4000 µg/L
 1/1 SYR4 2017
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DEZORT, DEVON
Phone
636-639-2054
Email
[email protected]

Frequently asked questions about Wentzville

Is Wentzville tap water safe to drink?

EPA monitoring detected 19 contaminants in Wentzville's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Wentzville's water?

EPA monitoring detected Copper, Bromodichloromethane, Chloroform, TTHM, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Wentzville serve?

Wentzville reports serving 41,784 people in Missouri, per its EPA record.

Has Wentzville had any water quality violations?

The EPA has 19 violations on file for Wentzville, of which 8 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

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.