Public water system record
Clinton Co PWSD 4 Sys 1
Serves an area of Clinton County and Caldwell County, MO that includes Lathrop and Lake Arrowhead · 4,968 people served
Federal records show 1 health-based violation and 3 monitoring/reporting issues for Clinton Co PWSD 4 Sys 1 in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- No
- Monitoring issues, last 10 years
- 3
Key facts
- Clinton Co PWSD 4 Sys 1 buys its water from Plattsburg PWS.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 81.8 µg/L, federal limit 80 µg/L (at or just above the limit), 2025.
- Record on file since 2006, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,976 unknown out of 1,977 service lines.
Check whether Clinton Co PWSD 4 Sys 1 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.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 81.8 µg/L, federal limit 80 µg/L (at or just above the limit)
|
220 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
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
|
Dec 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2024 | Active |
Full record since 2006
EPA's records for Clinton Co PWSD 4 Sys 1 go back to 2006. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 5 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 0 | 4 |
| 2010 to October 18, 2016 | 1 | 1 |
| 2020s | 1 | 3 |
Most recent health-based violation before October 19, 2016: Total Coliform, began September 2010, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2010 | Resolved |
What the violations mean
Total Trihalomethanes (TTHMs)
1 incidentDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Clinton Co PWSD 4 Sys 1 buys its water from Plattsburg PWS. It lists no wells or intakes of its own. It also has emergency connections to Clinton County PWSD 4 Sys 2 and Lathrop PWS. 2 other community water systems buy water from Clinton Co PWSD 4 Sys 1. 1 other public water system has an emergency connection to Clinton Co PWSD 4 Sys 1.
Buys water from
- Plattsburg PWS Plattsburg, MO
Emergency or part-time connections to
- Clinton County PWSD 4 Sys 2 Lathrop, MO
- Lathrop PWS Lathrop, MO
Community systems that buy water from it
- Caldwell County PWSD 3 Braymer, MO
- Clinton County PWSD 3 Cameron, MO
Annual water quality report
Clinton Co PWSD 4 Sys 1 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.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
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