A100/100
GSWC-SOUTH SAN GABRIEL — Water Quality Report 2026
Serving 26,240 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA1910223
Violations
0
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 1000.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About GSWC-SOUTH SAN GABRIEL
Is GSWC-SOUTH SAN GABRIEL water safe to drink?
GSWC-SOUTH SAN GABRIEL water receives a grade of A (100/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GSWC-SOUTH SAN GABRIEL detected?
69 contaminants were tested in GSWC-SOUTH SAN GABRIEL's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GSWC-SOUTH SAN GABRIEL have any EPA violations?
No, GSWC-SOUTH SAN GABRIEL has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does GSWC-SOUTH SAN GABRIEL serve?
GSWC-SOUTH SAN GABRIEL serves approximately 26,240 people, California.
What type of water does GSWC-SOUTH SAN GABRIEL provide?
GSWC-SOUTH SAN GABRIEL sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA1910223.
How does GSWC-SOUTH SAN GABRIEL compare to other utilities in California?
GSWC-SOUTH SAN GABRIEL scores 100/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.