What's in MERCER COUNTY PWSD 1's water?
MERCER COUNTY PWSD 1 has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 3,200 people through 1,525 service connections.
MERCER COUNTY PWSD 1's record against the rest of the country
14 total violations and 3 health-based ones put MERCER COUNTY PWSD 1 at the 60th percentile nationally for violation burden, rank 5,160 of 12,903.
How MERCER COUNTY PWSD 1 compares within MO
MERCER COUNTY PWSD 1's 3 health-based violations sit within the MO average of 6.1, across 327 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for MERCER COUNTY PWSD 1 is from 2027-03-03 (health-based: 2015-01-07). Last reported to EPA: 06/16/2026.
What kind of problem, specifically
MERCER COUNTY PWSD 1's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
- Disinfection byproducts - flagged from: TTHM
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
This is what MERCER COUNTY PWSD 1 reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 14 logged violations can see. The guide to what this data misses covers that gap.