South Wilmington East Brooklyn STP
10 Oak St PO Box 399, South Wilmington, IL 60474 · Grundy County · Publicly Owned Treatment Works
- Average flow
- 0.14 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- IL0054321
- Effective
- Permit expires
- December 2028
- Population served
- —
- CWNS 2022
South Wilmington East Brooklyn STP is a publicly owned wastewater treatment works in South Wilmington, Grundy County, Illinois treating an average of 0.14 million gallons per day against a permitted design capacity of 0.25 MGD. It discharges under NPDES permit IL0054321 (effective), which expires in December 2028, with 1 recorded violation in the last three years.
Treatment technology
2 treatment structures and unit processes identified at South Wilmington East Brooklyn STP.
Available with a free Klarifi account
See the full treatment train at South Wilmington East Brooklyn STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at South Wilmington East Brooklyn STP.
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Nearby wastewater treatment plants in Illinois
Gardner · 2 mi away
0.52 MGD
Essex · 6 mi away
0.2 MGD
Braidwood · 8 mi away
1.23 MGD
Diamond · 8 mi away
0.52 MGD
Coal City · 8 mi away
0.84 MGD
Mazon · 9 mi away
0.17 MGD
Wilmington · 12 mi away
0.93 MGD
Verona · 12 mi away
0.04 MGD
South Wilmington East Brooklyn STP: 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 5, 2026; facility record last updated November 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms