C59/100
RIVERDALE — Water Quality Report 2026
Serving 10,266 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0312580
Violations
14
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Surface water treatment technique failure
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 RIVERDALE
Is RIVERDALE water safe to drink?
RIVERDALE water receives a grade of C (59/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 14 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has RIVERDALE detected?
69 contaminants were tested in RIVERDALE's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does RIVERDALE have any EPA violations?
Yes, RIVERDALE has 14 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, TT. 6 are health-based violations.
How many people does RIVERDALE serve?
RIVERDALE serves approximately 10,266 people, Illinois. The system provides water to 1 community: Riverdale.
What type of water does RIVERDALE provide?
RIVERDALE 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 IL0312580.
How does RIVERDALE compare to other utilities in Illinois?
RIVERDALE scores 59/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Illinois state page for a full comparison of water systems.