Elmhurst Stp, City Of
Elmhurst, IL · Dupage County · Publicly Owned Treatment Works
- Average flow
- 7.92 MGD
- Design flow
- —
- NPDES permit
- ILL028746
- Effective
- Permit expires
- December 2030
- Population served
- 46,532
- CWNS 2022
Elmhurst Stp, City Of is a publicly owned wastewater treatment works in Elmhurst, Dupage County, Illinois treating an average of 7.92 million gallons per day, serving about 46,532 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit ILL028746 (effective), which expires in December 2030, with 8 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
22 verified contacts for Elmhurst Stp, City Of, with validated emails and direct phone numbers.
Unlock 22 verified contacts (19 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Elmhurst Stp, City Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Addison · 3 mi away
1.22 MGD
Addison · 4 mi away
2.24 MGD
Wood Dale · 5 mi away
0.19 MGD
Glen Ellyn · 5 mi away
7.04 MGD
Wood Dale · 6 mi away
1.03 MGD
Itasca · 7 mi away
0.9 MGD
Itasca · 7 mi away
—
Downers Grove · 8 mi away
6.39 MGD
Elmhurst Stp, City Of: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated March 6, 2025.