A87/100
CAROL STREAM — Water Quality Report 2026
Serving 39,854 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0430200
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 1, 2025 – May 31, 2025Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Unresolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 1, 2025 – May 31, 2025Rule: Total Coliform RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 CAROL STREAM
Is CAROL STREAM water safe to drink?
CAROL STREAM water receives a grade of A (87/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CAROL STREAM detected?
69 contaminants were tested in CAROL STREAM's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CAROL STREAM have any EPA violations?
Yes, CAROL STREAM has 6 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, MON, Other. 1 are health-based violations.
How many people does CAROL STREAM serve?
CAROL STREAM serves approximately 39,854 people, Illinois. The system provides water to 1 community: Carol Stream.
What type of water does CAROL STREAM provide?
CAROL STREAM 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 IL0430200.
How does CAROL STREAM compare to other utilities in Illinois?
CAROL STREAM 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.