A93/100
GSWC - SOUTHWEST — Water Quality Report 2026
Serving 277,740 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA1910155
Violations
3
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2014.
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 - SOUTHWEST
Is GSWC - SOUTHWEST water safe to drink?
GSWC - SOUTHWEST water receives a grade of A (93/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has GSWC - SOUTHWEST detected?
76 contaminants were tested in GSWC - SOUTHWEST's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does GSWC - SOUTHWEST have any EPA violations?
Yes, GSWC - SOUTHWEST has 3 EPA violation(s) on record, with the most recent in 2014. Violation types include MR, MCL. 1 are health-based violations.
How many people does GSWC - SOUTHWEST serve?
GSWC - SOUTHWEST serves approximately 277,740 people, California.
What type of water does GSWC - SOUTHWEST provide?
GSWC - SOUTHWEST 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 CA1910155.
How does GSWC - SOUTHWEST compare to other utilities in California?
GSWC - SOUTHWEST scores 93/100 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.