F12/100
YORK TOWNSHIP WATER SYSTEM — Water Quality Report 2026
Serving 1,423 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0430010
Violations
60
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Surface water treatment technique failure
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 YORK TOWNSHIP WATER SYSTEM
Is YORK TOWNSHIP WATER SYSTEM water safe to drink?
YORK TOWNSHIP WATER SYSTEM water receives a grade of F (12/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 60 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has YORK TOWNSHIP WATER SYSTEM detected?
1 contaminants were tested in YORK TOWNSHIP WATER SYSTEM's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does YORK TOWNSHIP WATER SYSTEM have any EPA violations?
Yes, YORK TOWNSHIP WATER SYSTEM has 60 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, TT. 7 are health-based violations.
How many people does YORK TOWNSHIP WATER SYSTEM serve?
YORK TOWNSHIP WATER SYSTEM serves approximately 1,423 people, Illinois. The system provides water to 1 community: Oak Brook Terr.
What type of water does YORK TOWNSHIP WATER SYSTEM provide?
YORK TOWNSHIP WATER SYSTEM 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 IL0430010.
How does YORK TOWNSHIP WATER SYSTEM compare to other utilities in Illinois?
YORK TOWNSHIP WATER SYSTEM scores 12/100 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.