New Lenox STP #3, Village Of
New Lenox, IL · Will County · Publicly Owned Treatment Works
- Average flow
- 0.15 MGD
- Design flow
- 1.24 MGD
- NPDES permit
- IL0075957
- Administratively continued
- Permit expires
- September 2025
- Population served
- 2,721
- CWNS 2022
New Lenox STP #3, Village Of is a publicly owned wastewater treatment works in New Lenox, Will County, Illinois treating an average of 0.15 million gallons per day against a permitted design capacity of 1.24 MGD, serving about 2,721 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IL0075957 (administratively continued), which expires in September 2025, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
23 verified contacts for New Lenox STP #3, Village Of, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at New Lenox STP #3, Village Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
New Lenox · 1 mi away
1.46 MGD
New Lenox · 3 mi away
0.84 MGD
Mokena · 4 mi away
1.84 MGD
Joliet · 4 mi away
0.11 MGD
Frankfort · 5 mi away
3.32 MGD
Manhattan · 6 mi away
0.81 MGD
Joliet · 7 mi away
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Lockport · 7 mi away
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New Lenox STP #3, Village 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 November 7, 2025.