A99/100
GSWC - CLAREMONT — Water Quality Report 2026
Serving 39,730 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA1910024
Violations
0
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 230.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/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 - CLAREMONT
Is GSWC - CLAREMONT water safe to drink?
GSWC - CLAREMONT water receives a grade of A (99/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GSWC - CLAREMONT detected?
69 contaminants were tested in GSWC - CLAREMONT's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does GSWC - CLAREMONT have any EPA violations?
No, GSWC - CLAREMONT has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does GSWC - CLAREMONT serve?
GSWC - CLAREMONT serves approximately 39,730 people, California.
What type of water does GSWC - CLAREMONT provide?
GSWC - CLAREMONT 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 CA1910024.
How does GSWC - CLAREMONT compare to other utilities in California?
GSWC - CLAREMONT scores 99/100 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.