GOLDEN STATE WATER CO - BARSTOW: EPA violation history, explained

GOLDEN STATE WATER CO - BARSTOW has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 32,547 people get their water from it, across 8,991 connections.

Ranked against every other system in this dataset

Out of 12,903 systems in this dataset, GOLDEN STATE WATER CO - BARSTOW ranks 9,186th by violation burden (29th percentile) - 1 violation total, 1 health-based.

Against the CA average

Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - GOLDEN STATE WATER CO - BARSTOW's 1 is at or below that. The filter guide explains what a violation like this actually calls for.

Most recent violation on record

GOLDEN STATE WATER CO - BARSTOW's most recent violation on record is dated 2009-01-11, with the most recent health-based one dated 2009-01-11. Last reported to EPA: 06/22/2026.

The concern categories on record

GOLDEN STATE WATER CO - BARSTOW'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 GOLDEN STATE WATER CO - BARSTOW's record does not cover

GOLDEN STATE WATER CO - BARSTOW's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Between the utility's meter and GOLDEN STATE WATER CO - BARSTOW's customers' taps is household plumbing, invisible to a system-level record ranked 9,186th of 12,903 by violation count. The guide to what this data misses covers that gap.