A.J. Larocca Wastewater Treatment Facility
333 S Villa Ave, Addison, IL 60101 · Dupage County · Publicly Owned Treatment Works
- Average flow
- 1.93 MGD
- Design flow
- —
- NPDES permit
- ILL027367
- Effective
- Permit expires
- December 2030
- Population served
- 13,610
- CWNS 2022
A.J. Larocca Wastewater Treatment Facility is a publicly owned wastewater treatment works in Addison, Dupage County, Illinois treating an average of 1.93 million gallons per day, serving about 13,610 residents. It discharges under NPDES permit ILL027367 (effective), which expires in December 2030, with 2 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at A.J. Larocca Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at A.J. Larocca Wastewater Treatment Facility: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
27 verified contacts for A.J. Larocca Wastewater Treatment Facility, with validated emails and direct phone numbers.
Unlock 27 verified contacts (24 more than shown)
Names, validated emails and direct phone numbers for decision-makers at A.J. Larocca Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Addison · 1 mi away
3.21 MGD
Wood Dale · 2 mi away
0.27 MGD
Elmhurst · 3 mi away
10.25 MGD
Wood Dale · 3 mi away
1.58 MGD
Itasca · 4 mi away
1.65 MGD
Itasca · 4 mi away
—
Glen Ellyn · 6 mi away
11.79 MGD
Roselle · 8 mi away
0.75 MGD
A.J. Larocca Wastewater Treatment Facility: 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 October 26, 2026; facility record last updated February 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms