MERCER, MO · Harrison County
MERCER COUNTY PWSD 1 Water System
Consumer Confidence Report status
MERCER COUNTY PWSD 1 must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for MERCER COUNTY PWSD 1.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Missouri’s official records. Always confirm current status with Missouri before making decisions based on this information.
System facts
- System ID (PWSID)
- MO2024382
- System type
- Community Water System
- Population served
- 3,200
- Service connections
- 1,525
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
MERCER COUNTY PWSD 1 is one of 489 community water systems in Missouri in the 501 to 3,300 people size category, serving 3,200 people from surface water.
As of August 1, 2026, its federal record holds 2 entries between 2023 and 2024, all of which EPA lists as closed.
All 2 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules.
Violation history
Monitoring, Routine (RTCR)
—Revised Total Coliform Rule
February 1, 2024 – February 29, 2024
ResolvedMonitoring, Routine (RTCR)
—Revised Total Coliform Rule
November 1, 2023 – November 30, 2023
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| February 1, 2024 – February 29, 2024 | Monitoring, Routine (RTCR) | Revised Total Coliform Rule | — | Resolved |
| November 1, 2023 – November 30, 2023 | Monitoring, Routine (RTCR) | Revised Total Coliform Rule | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- March 1, 2025State Compliance achieved671 linked violations
Common questions
Is MERCER COUNTY PWSD 1 required to publish a Consumer Confidence Report?
- Yes. MERCER COUNTY PWSD 1 is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is MERCER COUNTY PWSD 1’s next Consumer Confidence Report due?
- MERCER COUNTY PWSD 1’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MERCER COUNTY PWSD 1 have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for MERCER COUNTY PWSD 1.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
SIEMER, TIFFANY
660-382-4776
MERCER, MO 64661-0000