B76/100
RIO DELL, CITY OF — Water Quality Report 2026
Serving 3,300 people · California
Water Source
Surface Water
County
—
System ID
CA1210012
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 3.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1996.
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 RIO DELL, CITY OF
Is RIO DELL, CITY OF water safe to drink?
RIO DELL, CITY OF water receives a grade of B (76/100), which is considered good. 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 RIO DELL, CITY OF detected?
32 contaminants were tested in RIO DELL, CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does RIO DELL, CITY OF have any EPA violations?
Yes, RIO DELL, CITY OF has 4 EPA violation(s) on record, with the most recent in 1996. Violation types include MCL, MR. 3 are health-based violations.
How many people does RIO DELL, CITY OF serve?
RIO DELL, CITY OF serves approximately 3,300 people, California. The system provides water to 1 community: Rio Dell.
What type of water does RIO DELL, CITY OF provide?
RIO DELL, CITY OF 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 CA1210012.
How does RIO DELL, CITY OF compare to other utilities in California?
RIO DELL, CITY OF scores 76/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our California state page for a full comparison of water systems.