A82/100
MARENGO — Water Quality Report 2026
Serving 7,572 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1110650
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.41 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 MARENGO
Is MARENGO water safe to drink?
MARENGO water receives a grade of A (82/100), which is considered excellent. 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 MARENGO detected?
32 contaminants were tested in MARENGO's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does MARENGO have any EPA violations?
Yes, MARENGO has 6 EPA violation(s) on record, with the most recent in 2009. Violation types include MR, MCL. 1 are health-based violations.
How many people does MARENGO serve?
MARENGO serves approximately 7,572 people, Illinois. The system provides water to 1 community: Marengo.
What type of water does MARENGO provide?
MARENGO sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1110650.
How does MARENGO compare to other utilities in Illinois?
MARENGO scores 82/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Illinois state page for a full comparison of water systems.