- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 8 of 8 samples, average 33.3 µg/L, highest 48.4 µg/L (EPA UCMR 5 testing, Mar 2024–Dec 2024)
- Lead: 9 in 10 homes tested came in at or below 4.77 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2022–Dec 31, 2024). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Public EPA test results
Can you drink Wentzville tap water? What EPA records show
EPA system ID MO6010849 · serves Wentzville, MO · about 41,784 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Wentzville PWS (EPA MO6010849)
EPA data as of October 14, 2026. For Wentzville's main utility, Wentzville PWS: We found no health-standard violations in EPA's records for this system (MO6010849) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Wentzville PWS, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (MO6010849) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Wentzville PWS (SDWIS). Data as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 4.77 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2022–Dec 31, 2024). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Wentzville PWS use chloramine?
EPA treatment records (state-reported) list chloramines for Wentzville PWS. EPA record