D35/100
CARY — Water Quality Report 2026
Serving 17,826 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1110100
Violations
18
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
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 CARY
Is CARY water safe to drink?
CARY water receives a grade of D (35/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 18 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CARY detected?
66 contaminants were tested in CARY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CARY have any EPA violations?
Yes, CARY has 18 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MCL, MR. 11 are health-based violations.
How many people does CARY serve?
CARY serves approximately 17,826 people, Illinois. The system provides water to 1 community: Cary.
What type of water does CARY provide?
CARY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1110100.
How does CARY compare to other utilities in Illinois?
CARY scores 35/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Illinois state page for a full comparison of water systems.