City of Rockville, MD Water Quality
City of Rockville: EPA violation history, explained
City of Rockville has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 52,000 people through 17,500 service connections.
City of Rockville's record against the rest of the country
City of Rockville has 89 violations on record in total, 1 of them health-based - ranking it 7,270th of 12,903 systems by violation count, the 44th percentile nationally.
How City of Rockville compares within MD
Among the 98 MD systems in this dataset, the average is 3.2 health-based violations - City of Rockville's 1 is at or below that. 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 City of Rockville is from 2025-02-07 (health-based: 2008-01-10). Last reported to EPA: 05/18/2026.
What kind of problem, specifically
City of Rockville'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:
- Disinfection byproducts - flagged from: Tthm
The most severe category on record is disinfection byproducts, which points toward a carbon-class filter if you want to address it directly.
What this data is and is not
Everything on this page is City of Rockville's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and City of Rockville's customers' taps is household plumbing, invisible to a system-level record ranked 7,270th of 12,903 by violation count. The guide to what this data misses covers that gap.