Coalinga-City, CA Water Quality
What's in Coalinga-City's water?
Coalinga-City has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 17,277 people through 4,026 service connections.
Ranked against every other system in this dataset
18 total violations and 14 health-based ones put Coalinga-City at the 89th percentile nationally for violation burden, rank 1,397 of 12,903.
How Coalinga-City compares within CA
Coalinga-City's 14 health-based violations sit above the CA average of 5.8, across 804 systems statewide. 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 Coalinga-City is from 2016-01-10 (health-based: 2015-01-10). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
Coalinga-City'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: Surface Water Treatment 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 this data is and is not
Everything on this page is Coalinga-City's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and Coalinga-City's customers' taps is household plumbing, invisible to a system-level record ranked 1,397th of 12,903 by violation count. The guide to what this data misses covers that gap.