B78/100
CHATHAM — Water Quality Report 2026
Serving 16,423 people · Illinois
Water Source
Purchased Groundwater
County
—
System ID
IL1670300
Violations
14
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2017.
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 CHATHAM
Is CHATHAM water safe to drink?
CHATHAM water receives a grade of B (78/100), which is considered good. Out of 66 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CHATHAM detected?
66 contaminants were tested in CHATHAM's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CHATHAM have any EPA violations?
Yes, CHATHAM has 14 EPA violation(s) on record, with the most recent in 2017. Violation types include MR, Other, MCL. 2 are health-based violations.
How many people does CHATHAM serve?
CHATHAM serves approximately 16,423 people, Illinois. The system provides water to 1 community: Chatham.
What type of water does CHATHAM provide?
CHATHAM sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1670300.
How does CHATHAM compare to other utilities in Illinois?
CHATHAM scores 78/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Illinois state page for a full comparison of water systems.