What this tracks
This dataset records public water systems in Missouri that have repeatedly violated drinking water monitoring requirements set by the Department of Natural Resources.
Why it matters to you
If you’re served by a small water system — like a mobile home park, subdivision, or rural community — this tells you whether your water provider has failed to properly test for contaminants like bacteria. Chronic violators may not be monitoring water safety as required by law, which could mean undetected health risks in your drinking water. Missouri residents can check if their water system appears on this list to understand potential gaps in safety monitoring.
How to read this data
population_served — The name and number of people served by each water system, like “West Central Christian Service: 100” for smaller community systems. location_or_nearest_town — The physical address or nearest town where the water system operates, such as “24310 Mahin Rd, La Monte.” months_of_major_monitoring_violations_may_2025_to_april_2026 — Specific months when the system failed to conduct required water testing, showing patterns like “May 2025, June 2025, July 2025, August 2025, February 2026, April 2026.” most_recent_results — The latest test results when sampling did occur, such as “Negative for Total Coliform” indicating no harmful bacteria detected.
Try it yourself
Look up your address or community name in the location_or_nearest_town field to see if your water system is listed as a chronic violator, then check the months_of_major_monitoring_violations to understand how recently monitoring problems occurred.