A86/100
WINDSOR, TOWN OF — Water Quality Report 2026
Serving 25,561 people · California
Water Source
Groundwater
County
—
System ID
CA4910017
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 350.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2008.
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 WINDSOR, TOWN OF
Is WINDSOR, TOWN OF water safe to drink?
WINDSOR, TOWN OF water receives a grade of A (86/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WINDSOR, TOWN OF detected?
66 contaminants were tested in WINDSOR, TOWN OF's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WINDSOR, TOWN OF have any EPA violations?
Yes, WINDSOR, TOWN OF has 3 EPA violation(s) on record, with the most recent in 2008. Violation types include Other, MCL. 2 are health-based violations.
How many people does WINDSOR, TOWN OF serve?
WINDSOR, TOWN OF serves approximately 25,561 people, California.
What type of water does WINDSOR, TOWN OF provide?
WINDSOR, TOWN OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910017.
How does WINDSOR, TOWN OF compare to other utilities in California?
WINDSOR, TOWN OF scores 86/100 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.