What's in GRAIN VALLEY PWS's water?
GRAIN VALLEY PWS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 16,000 people through 6,052 service connections.
How this compares nationally
11 total violations and 1 health-based ones put GRAIN VALLEY PWS at the 37th percentile nationally for violation burden, rank 8,147 of 12,903.
How GRAIN VALLEY PWS compares within MO
GRAIN VALLEY PWS's 1 health-based violations sit within the MO average of 6.1, across 327 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for GRAIN VALLEY PWS is from 2025-02-07 (health-based: 2015-01-07). Last reported to EPA: 06/16/2026.
What kind of problem, specifically
GRAIN VALLEY PWS'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)
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 GRAIN VALLEY PWS 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. This record - 1 health-based violation on file for GRAIN VALLEY PWS - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.