C44/100
WARRENVILLE — Water Quality Report 2026
Serving 12,350 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0430833
Violations
50
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
strontium | 1675.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – September 15, 2025Enforcement: Resolving — corrective action underway
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 WARRENVILLE
Is WARRENVILLE water safe to drink?
WARRENVILLE water receives a grade of C (44/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 50 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WARRENVILLE detected?
66 contaminants were tested in WARRENVILLE's water. Notable contaminants include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does WARRENVILLE have any EPA violations?
Yes, WARRENVILLE has 50 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR.
How many people does WARRENVILLE serve?
WARRENVILLE serves approximately 12,350 people, Illinois. The system provides water to 1 community: Warrenville.
What type of water does WARRENVILLE provide?
WARRENVILLE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0430833.
How does WARRENVILLE compare to other utilities in Illinois?
WARRENVILLE scores 44/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Illinois state page for a full comparison of water systems.