F17/100
CITY OF SUNNYVALE — Water Quality Report 2026
Serving 157,566 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA4310014
Violations
68
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 250.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
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 CITY OF SUNNYVALE
Is CITY OF SUNNYVALE water safe to drink?
CITY OF SUNNYVALE water receives a grade of F (17/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 68 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CITY OF SUNNYVALE detected?
76 contaminants were tested in CITY OF SUNNYVALE's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CITY OF SUNNYVALE have any EPA violations?
Yes, CITY OF SUNNYVALE has 68 EPA violation(s) on record, with the most recent in 2015. Violation types include TT, MR. 3 are health-based violations.
How many people does CITY OF SUNNYVALE serve?
CITY OF SUNNYVALE serves approximately 157,566 people, California. The system provides water to 1 community: Sunnyvale.
What type of water does CITY OF SUNNYVALE provide?
CITY OF SUNNYVALE 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 CA4310014.
How does CITY OF SUNNYVALE compare to other utilities in California?
CITY OF SUNNYVALE scores 17/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.