A89/100
RIVERSIDE, CITY OF — Water Quality Report 2026
Serving 298,398 people · California
Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
CA3310031
Violations
1
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
1,4-dioxane | 0.600 µg/L | — | Above Goal |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1981.
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 RIVERSIDE, CITY OF
Is RIVERSIDE, CITY OF water safe to drink?
RIVERSIDE, CITY OF water receives a grade of A (89/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has RIVERSIDE, CITY OF detected?
76 contaminants were tested in RIVERSIDE, CITY OF's water. Notable contaminants include Lead (90th percentile), 1,4-dioxane. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does RIVERSIDE, CITY OF have any EPA violations?
Yes, RIVERSIDE, CITY OF has 1 EPA violation(s) on record, with the most recent in 1981. Violation types include MCL. 1 are health-based violations.
How many people does RIVERSIDE, CITY OF serve?
RIVERSIDE, CITY OF serves approximately 298,398 people, California. The system provides water to 1 community: Riverside.
What type of water does RIVERSIDE, CITY OF provide?
RIVERSIDE, CITY OF sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3310031.
How does RIVERSIDE, CITY OF compare to other utilities in California?
RIVERSIDE, CITY OF 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.