GSWC - SOUTHWEST: EPA violation history, explained
GSWC - SOUTHWEST has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 277,740, over 52,644 connections.
GSWC - SOUTHWEST's record against the rest of the country
GSWC - SOUTHWEST has 4 violations on record in total, 1 of them health-based - ranking it 8,790th of 12,903 systems by violation count, the 32th percentile nationally.
Against the CA average
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - GSWC - SOUTHWEST's 1 is at or below that. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
GSWC - SOUTHWEST's most recent violation on record is dated 2015-09-11, with the most recent health-based one dated 2011-01-11. Last reported to EPA: 06/22/2026.
The concern categories on record
GSWC - SOUTHWEST'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 GSWC - SOUTHWEST's record does not cover
Everything on this page is GSWC - SOUTHWEST's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 1 health-based violation on file for GSWC - SOUTHWEST - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.