A85/100
BARRINGTON — Water Quality Report 2026
Serving 10,327 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0974080
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.43 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1998.
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 BARRINGTON
Is BARRINGTON water safe to drink?
BARRINGTON water receives a grade of A (85/100), which is considered excellent. Out of 67 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has BARRINGTON detected?
67 contaminants were tested in BARRINGTON's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does BARRINGTON have any EPA violations?
Yes, BARRINGTON has 3 EPA violation(s) on record, with the most recent in 1998. Violation types include MR, TT. 1 are health-based violations.
How many people does BARRINGTON serve?
BARRINGTON serves approximately 10,327 people, Illinois. The system provides water to 1 community: Barrington.
What type of water does BARRINGTON provide?
BARRINGTON sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0974080.
How does BARRINGTON compare to other utilities in Illinois?
BARRINGTON scores 85/100 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.