A89/100
CITY OF REDWOOD CITY — Water Quality Report 2026
Serving 92,819 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA4110022
Violations
3
Contaminant Test Results
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 REDWOOD CITY
Is CITY OF REDWOOD CITY water safe to drink?
CITY OF REDWOOD CITY water receives a grade of A (89/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CITY OF REDWOOD CITY detected?
69 contaminants were tested in CITY OF REDWOOD CITY's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CITY OF REDWOOD CITY have any EPA violations?
Yes, CITY OF REDWOOD CITY has 3 EPA violation(s) on record, with the most recent in 2015. Violation types include TT, MCL, MR. 2 are health-based violations.
How many people does CITY OF REDWOOD CITY serve?
CITY OF REDWOOD CITY serves approximately 92,819 people, California. The system provides water to 1 community: Redwood City.
What type of water does CITY OF REDWOOD CITY provide?
CITY OF REDWOOD CITY 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 CA4110022.
How does CITY OF REDWOOD CITY compare to other utilities in California?
CITY OF REDWOOD CITY scores 89/100 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.