A100/100
CAHOKIA HEIGHTS — Water Quality Report 2026
Serving 15,250 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL1635000
Violations
0
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
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 CAHOKIA HEIGHTS
Is CAHOKIA HEIGHTS water safe to drink?
CAHOKIA HEIGHTS water receives a grade of A (100/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CAHOKIA HEIGHTS detected?
31 contaminants were tested in CAHOKIA HEIGHTS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CAHOKIA HEIGHTS have any EPA violations?
No, CAHOKIA HEIGHTS has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does CAHOKIA HEIGHTS serve?
CAHOKIA HEIGHTS serves approximately 15,250 people, Illinois. The system provides water to 1 community: Cahokia.
What type of water does CAHOKIA HEIGHTS provide?
CAHOKIA HEIGHTS sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL1635000.
How does CAHOKIA HEIGHTS compare to other utilities in Illinois?
CAHOKIA HEIGHTS scores 100/100 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.