Water Quality in MERCER, MO (64661)
EPA violation data for public water systems serving ZIP code 64661.
43
Total Violations
16
Health-Based
27
Monitoring / Reporting
43
Resolved
What does this mean?
43 of 43 violations have been resolved. 16 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 27 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.
Violations Detail (43 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| TTHM | Health-Based | N/A | 81.05 | Jun 30, 2025 | Resolved | N/A |
| TTHM | Health-Based | N/A | 85 | Mar 31, 2025 | Resolved | N/A |
| TTHM | Health-Based | N/A | 85 | Mar 31, 2025 | Resolved | N/A |
| TTHM | Health-Based | N/A | 85 | Mar 31, 2025 | Resolved | N/A |
| Public Notice | Monitoring | N/A | N/A | Mar 26, 2025 | Resolved | N/A |
| Public Notice | Monitoring | N/A | N/A | Mar 4, 2025 | Resolved | N/A |
| TTHM | Health-Based | N/A | 88 | Sep 30, 2024 | Resolved | N/A |
| TTHM | Health-Based | N/A | 88 | Sep 30, 2024 | Resolved | N/A |
| TTHM | Health-Based | N/A | 88 | Sep 30, 2024 | Resolved | N/A |
| TTHM | Health-Based | N/A | 88 | Sep 30, 2024 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2025(6)
TTHM
02
TTHM
02
TTHM
02
TTHM
02
Public Notice
75
Public Notice
75
2024(20)
TTHM
02
TTHM
02
TTHM
02
TTHM
02
TTHM
02
TTHM
02
TTHM
02
TTHM
02
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
TTHM
02
TTHM
02
TTHM
02
TTHM
02
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
How Does This Compare?
MERCER (64661) has 43 recorded violations, including 16 health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.
Recommended Water Filters
Based on the contaminants detected in your area, these filter types may help improve your water quality.
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.