A89/100
CERRO GORDO — Water Quality Report 2026
Serving 1,433 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1470100
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.87 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – July 16, 2024Enforcement: Resolving — corrective action underway
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 CERRO GORDO
Is CERRO GORDO water safe to drink?
CERRO GORDO water receives a grade of A (89/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CERRO GORDO detected?
2 contaminants were tested in CERRO GORDO's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does CERRO GORDO have any EPA violations?
Yes, CERRO GORDO has 3 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR.
How many people does CERRO GORDO serve?
CERRO GORDO serves approximately 1,433 people, Illinois. The system provides water to 1 community: Cerro Gordo.
What type of water does CERRO GORDO provide?
CERRO GORDO sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1470100.
How does CERRO GORDO compare to other utilities in Illinois?
CERRO GORDO scores 89/100 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.