A82/100
CITY OF RIO VISTA — Water Quality Report 2026
Serving 10,489 people · California
Water Source
Groundwater
County
—
System ID
CA4810004
Violations
6
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2000.
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 RIO VISTA
Is CITY OF RIO VISTA water safe to drink?
CITY OF RIO VISTA water receives a grade of A (82/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CITY OF RIO VISTA detected?
31 contaminants were tested in CITY OF RIO VISTA's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CITY OF RIO VISTA have any EPA violations?
Yes, CITY OF RIO VISTA has 6 EPA violation(s) on record, with the most recent in 2000. Violation types include MR, MCL. 3 are health-based violations.
How many people does CITY OF RIO VISTA serve?
CITY OF RIO VISTA serves approximately 10,489 people, California. The system provides water to 1 community: Rio Vista.
What type of water does CITY OF RIO VISTA provide?
CITY OF RIO VISTA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4810004.
How does CITY OF RIO VISTA compare to other utilities in California?
CITY OF RIO VISTA scores 82/100 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.