B79/100
NILES — Water Quality Report 2026
Serving 29,350 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0312010
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.012 mg/L | 0.015 mg/L | Above Goal |
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 NILES
Is NILES water safe to drink?
NILES water receives a grade of B (79/100), which is considered good. 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 NILES detected?
69 contaminants were tested in NILES's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does NILES have any EPA violations?
Yes, NILES has 6 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MCL, MR. 3 are health-based violations.
How many people does NILES serve?
NILES serves approximately 29,350 people, Illinois. The system provides water to 1 community: Niles.
What type of water does NILES provide?
NILES 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 IL0312010.
How does NILES compare to other utilities in Illinois?
NILES scores 79/100 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.