Darien, IL 60561
7 water systems • 35,146 residents
Moderate water quality - consider filtration
Score: 54/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
47
Contaminants Detected
377
Violations on Record
34
Health-Based Violations
0
Recent Violations
Grade Breakdown
54 / 100 points
Recommended Water Filters
- ✓Point-of-Use Carbon Filter (NSF-certified for lead)
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Activated Carbon Filter (disinfection byproducts)
Consult a water quality specialist for personalized recommendations.
Darien vs IL & National Average
Detected Contaminants
47 contaminants detected across water systems serving this ZIP code
Water System Information
- Systems Serving This ZIP:
- YORK TOWNSHIP WATER SYSTEM, STEEPLE RUN SBDV, GLEN ELLYN HEIGHTS SUBDIVISION, SOUTHEAST REGIONAL WATER FACILITY, HOBSON VALLEY WATER SYSTEM +2 more
- Population Served:
- 35,146
- Systems With Violations:
- 7 of 7
- Major Violations:
- 181
- Enforcement Actions:
- 365
Frequently Asked Questions
What does the grade mean?
Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.
Is my tap water safe to drink?
Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.
How often is the data updated?
We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.
What filters do you recommend?
Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.