What's in CITY OF COLUSA's water?
CITY OF COLUSA has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 6,447, over 2,276 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, CITY OF COLUSA ranks 8,866th by violation burden (31th percentile) - 4 violations total, 1 health-based.
Against the CA average
CA's 803 covered systems average 5.8 health-based violations each; CITY OF COLUSA carries 1, not more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
CITY OF COLUSA's most recent violation on record is dated 2022-01-03, with the most recent health-based one dated 1993-01-12. Last reported to EPA: 06/22/2026.
The concern categories on record
CITY OF COLUSA'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 CITY OF COLUSA's record does not cover
This is what CITY OF COLUSA 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 CITY OF COLUSA's customers' taps is household plumbing, invisible to a system-level record ranked 8,866th of 12,903 by violation count. The guide to what this data misses covers that gap.