F0/100
CORTLAND — Water Quality Report 2026
Serving 4,270 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0370051
Violations
34
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – May 22, 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 CORTLAND
Is CORTLAND water safe to drink?
CORTLAND water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 34 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CORTLAND detected?
31 contaminants were tested in CORTLAND's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CORTLAND have any EPA violations?
Yes, CORTLAND has 34 EPA violation(s) on record, with the most recent in 2023. Violation types include Other, MR, MCL. 25 are health-based violations.
How many people does CORTLAND serve?
CORTLAND serves approximately 4,270 people, Illinois. The system provides water to 1 community: Cortland.
What type of water does CORTLAND provide?
CORTLAND sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0370051.
How does CORTLAND compare to other utilities in Illinois?
CORTLAND scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Illinois state page for a full comparison of water systems.