Colorado River Regional Water System: EPA violation history, explained
Colorado River Regional Water System has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 3,476 people through 1,860 service connections.
Ranked against every other system in this dataset
Colorado River Regional Water System has 58 violations on record in total, 17 of thems health-based - ranking it 1,069th of 12,903 systems by violation count, the 92th percentile nationally.
Against the AZ average
Among the 199 AZ systems in this dataset, the average is 8.2 health-based violations - Colorado River Regional Water System's 17 is above that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
Colorado River Regional Water System's most recent violation on record is dated 2025-05-10, with the most recent health-based one dated 2020-01-04. Last reported to EPA: 06/30/2026.
The concern categories on record
Colorado River Regional Water System'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); Groundwater Rule; Revised Total Coliform Rule
- 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 Colorado River Regional Water System's record does not cover
This is what Colorado River Regional Water System 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. Between the utility's meter and Colorado River Regional Water System's customers' taps is household plumbing, invisible to a system-level record ranked 1,069th of 12,903 by violation count. The guide to what this data misses covers that gap.