B72/100
WINFIELD — Water Quality Report 2026
Serving 9,835 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0431150
Violations
16
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.04 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 WINFIELD
Is WINFIELD water safe to drink?
WINFIELD water receives a grade of B (72/100), which is considered good. Out of 35 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WINFIELD detected?
35 contaminants were tested in WINFIELD's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does WINFIELD have any EPA violations?
Yes, WINFIELD has 16 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, MCL. 1 are health-based violations.
How many people does WINFIELD serve?
WINFIELD serves approximately 9,835 people, Illinois. The system provides water to 1 community: Winfield.
What type of water does WINFIELD provide?
WINFIELD 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 IL0431150.
How does WINFIELD compare to other utilities in Illinois?
WINFIELD scores 72/100 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.