What's in CITY OF HOUSTON's water?
CITY OF HOUSTON had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. Population served: 2,970,543, over 990,181 connections.
CITY OF HOUSTON's record against the rest of the country
CITY OF HOUSTON has 9 violations on record in total, 4 of thems health-based - ranking it 4,418th of 12,903 systems by violation count, the 66th percentile nationally.
How CITY OF HOUSTON compares within TX
TX's 1,633 covered systems average 6.7 health-based violations each; CITY OF HOUSTON carries 4, 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 HOUSTON is from 2025-01-05 (health-based: 2025-01-05). Last reported to EPA: 06/26/2026.
What kind of problem, specifically
CITY OF HOUSTON'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); Interim Enhanced Surface Water Treatment Rule
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 HOUSTON 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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 9 logged violations can see. The guide to what this data misses covers that gap.