CITY OF RIO VISTA: EPA violation history, explained
CITY OF RIO VISTA has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 10,489 people get their water from it, across 5,646 connections.
Ranked against every other system in this dataset
CITY OF RIO VISTA has 6 violations on record in total, 3 of thems health-based - ranking it 5,489th of 12,903 systems by violation count, the 57th percentile nationally.
How CITY OF RIO VISTA compares within CA
CA's 803 covered systems average 5.8 health-based violations each; CITY OF RIO VISTA carries 3, not more than typical for the state. 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 RIO VISTA is from 2000-01-07 (health-based: 1995-01-01). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CITY OF RIO VISTA'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 this data is and is not
This is what CITY OF RIO VISTA 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 RIO VISTA's customers' taps is household plumbing, invisible to a system-level record ranked 5,489th of 12,903 by violation count. The guide to what this data misses covers that gap.