A97/100
COTATI, CITY OF — Water Quality Report 2026
Serving 7,303 people · California
Water Source
Groundwater
County
—
System ID
CA4910016
Violations
0
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
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 COTATI, CITY OF
Is COTATI, CITY OF water safe to drink?
COTATI, CITY OF water receives a grade of A (97/100), which is considered excellent. Out of 52 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has COTATI, CITY OF detected?
52 contaminants were tested in COTATI, CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does COTATI, CITY OF have any EPA violations?
No, COTATI, CITY OF has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does COTATI, CITY OF serve?
COTATI, CITY OF serves approximately 7,303 people, California. The system provides water to 1 community: Cotati.
What type of water does COTATI, CITY OF provide?
COTATI, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910016.
How does COTATI, CITY OF compare to other utilities in California?
COTATI, CITY OF scores 97/100 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.