A86/100
SERRANO WATER DISTRICT — Water Quality Report 2026
Serving 5,659 people · California
Water Source
Surface Water
County
—
System ID
CA3010082
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.21 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2004.
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 SERRANO WATER DISTRICT
Is SERRANO WATER DISTRICT water safe to drink?
SERRANO WATER DISTRICT water receives a grade of A (86/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SERRANO WATER DISTRICT detected?
32 contaminants were tested in SERRANO WATER DISTRICT's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does SERRANO WATER DISTRICT have any EPA violations?
Yes, SERRANO WATER DISTRICT has 2 EPA violation(s) on record, with the most recent in 2004. Violation types include TT, MR. 1 are health-based violations.
How many people does SERRANO WATER DISTRICT serve?
SERRANO WATER DISTRICT serves approximately 5,659 people, California.
What type of water does SERRANO WATER DISTRICT provide?
SERRANO WATER DISTRICT sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3010082.
How does SERRANO WATER DISTRICT compare to other utilities in California?
SERRANO WATER DISTRICT 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.