MERCER PWS
PWSID: MO2010515 · Mercer, MO · Serves 318 people
MERCER PWS has 20 health-based violations out of 20 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
MERCER PWS (PWSID MO2010515) is a cws water system drawing from a groundwater source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 318 people in Mercer, MO, and is subject to primacy enforcement by the Missouri drinking-water program.
The system's federal compliance record contains 20 total violations, with 20 classified as health-based (MCL exceedances or treatment-technique failures). 1 distinct contaminant has been cited, including Total Trihalomethanes (TTHM). Recorded violations span 2016–2025.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Missouri state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- MO2010515
- System Type
- CWS
- Water Source
- Groundwater
- Location
- Mercer, MO
- Population Served
- 318
- Health Violations
- Yes (20)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Total Trihalomethanes (TTHM) | 20 | 20 |
Violation History (20)
| Contaminant | Health | Date |
|---|---|---|
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2025 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2025 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2025 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2024 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2020 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2020 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2020 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2019 |
| Total Trihalomethanes (TTHM) | Yes | Apr 1, 2016 |
Frequently Asked Questions
Is MERCER PWS water safe to drink?
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What violations does MERCER PWS have?
What contaminants have been found in MERCER PWS water?
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.