What's in COCOS's water?
COCOS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 9,930, over 3,719 connections.
Ranked against every other system in this dataset
COCOS has 399 violations on record in total, 19 of thems health-based - ranking it 921th of 12,903 systems by violation count, the 93th percentile nationally.
Against the average
's 244 covered systems average 11.2 health-based violations each; COCOS carries 19, more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
COCOS's most recent violation on record is dated 2020-01-10, with the most recent health-based one dated 2016-01-01. Last reported to EPA: 06/05/2026.
The concern categories on record
COCOS'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)
- Nitrate / nitrite - flagged from: Nitrate
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 COCOS's record does not cover
This is what COCOS 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 COCOS's customers' taps is household plumbing, invisible to a system-level record ranked 921th of 12,903 by violation count. The guide to what this data misses covers that gap.