C40/100
ALGONQUIN — Water Quality Report 2026
Serving 30,700 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1110050
Violations
22
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
strontium | 1847.68 µg/L | — | Above Goal |
chlorate | 771.24 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2007.
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 ALGONQUIN
Is ALGONQUIN water safe to drink?
ALGONQUIN water receives a grade of C (40/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 22 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ALGONQUIN detected?
67 contaminants were tested in ALGONQUIN's water. Notable contaminants include Copper (90th percentile), strontium, chlorate. 1 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does ALGONQUIN have any EPA violations?
Yes, ALGONQUIN has 22 EPA violation(s) on record, with the most recent in 2007. Violation types include Other, MCL, MR. 6 are health-based violations.
How many people does ALGONQUIN serve?
ALGONQUIN serves approximately 30,700 people, Illinois. The system provides water to 1 community: Algonquin.
What type of water does ALGONQUIN provide?
ALGONQUIN sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1110050.
How does ALGONQUIN compare to other utilities in Illinois?
ALGONQUIN scores 40/100 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.