A87/100
SOMONAUK — Water Quality Report 2026
Serving 1,786 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0374870
Violations
5
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2007.
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 SOMONAUK
Is SOMONAUK water safe to drink?
SOMONAUK water receives a grade of A (87/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has SOMONAUK detected?
1 contaminants were tested in SOMONAUK's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does SOMONAUK have any EPA violations?
Yes, SOMONAUK has 5 EPA violation(s) on record, with the most recent in 2007. Violation types include Other, TT, MR. 2 are health-based violations.
How many people does SOMONAUK serve?
SOMONAUK serves approximately 1,786 people, Illinois. The system provides water to 1 community: Somonauk.
What type of water does SOMONAUK provide?
SOMONAUK sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0374870.
How does SOMONAUK compare to other utilities in Illinois?
SOMONAUK scores 87/100 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.