Public water system record
Wentzville PWS
Serves Wentzville, St. Charles County, MO · 41,784 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Wentzville PWS in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Wentzville PWS draws water from 2 wells.
- Record on file since 1991, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 1 lead and 2 unknown out of 16,195 service lines.
Check whether Wentzville PWS serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2018 | Resolved |
Full record since 1991
EPA's records for Wentzville PWS go back to 1991. Before October 19, 2016 they list 2 health-based violations (2 resolved) and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 2 |
| 2000s | 2 | 1 |
| October 19, 2016 to 2019 | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began September 2007, Resolved.
Show all 2 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2005 | Resolved |
Where the water comes from
Wentzville PWS draws water from 2 wells. It also buys water from St Charles County PWSD 2. 2 other public water systems have emergency connections to Wentzville PWS.
Buys water from
- St Charles County PWSD 2 O'Fallon, MO
Annual water quality report
Wentzville PWS must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Missouri.
Certified drinking water labs by state EPA guidance for private wells