A90/100
BUFFALO GROVE — Water Quality Report 2026
Serving 43,212 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0314180
Violations
6
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
0
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: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – January 12, 2024Enforcement: 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 BUFFALO GROVE
Is BUFFALO GROVE water safe to drink?
BUFFALO GROVE water receives a grade of A (90/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has BUFFALO GROVE detected?
69 contaminants were tested in BUFFALO GROVE's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does BUFFALO GROVE have any EPA violations?
Yes, BUFFALO GROVE has 6 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, MCL. 1 are health-based violations.
How many people does BUFFALO GROVE serve?
BUFFALO GROVE serves approximately 43,212 people, Illinois. The system provides water to 1 community: Buffalo Grove.
What type of water does BUFFALO GROVE provide?
BUFFALO GROVE 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 IL0314180.
How does BUFFALO GROVE compare to other utilities in Illinois?
BUFFALO GROVE scores 90/100 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.