Public water system record
St Charles County PWSD 2
Serves an area of St. Charles County, MO that includes O'Fallon, Wentzville, Lake St. Louis and 8 more places · 100,587 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for St Charles County PWSD 2 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
- 2
Key facts
- St Charles County PWSD 2 draws water from 13 wells (3 of them for emergency, seasonal or other part-time use).
- Record on file since 1996, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 4,452 unknown out of 42,007 service lines.
Check whether St Charles County PWSD 2 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 |
|---|---|---|
|
Groundwater Rule
Monitoring and reporting
|
Jun 1, 2025 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2021 | Resolved |
Full record since 1996
EPA's records for St Charles County PWSD 2 go back to 1996. Before October 19, 2016 they list 2 health-based violations (2 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 0 |
| 2000s | 1 | 0 |
| 2020s | 0 | 2 |
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
|
Dec 1, 1996 | Resolved |
Where the water comes from
St Charles County PWSD 2 draws water from 13 wells (3 of them for emergency, seasonal or other part-time use). It also buys water from St Louis City PWS. 2 other community water systems buy water from St Charles County PWSD 2.
Buys water from
- St Louis City PWS St Louis, MO
Community systems that buy water from it
- Ofallon PWS O Fallon, MO
- Wentzville PWS Wentzville, MO
Annual water quality report
St Charles County PWSD 2 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