Washburn STP
Washburn, IL · Marshall County · Publicly Owned Treatment Works
- Average flow
- 0.07 MGD
- Design flow
- 1.13 MGD
- NPDES permit
- IL0039411
- Effective
- Permit expires
- July 2031
- Population served
- 1,095
- CWNS 2022
Washburn STP is a publicly owned wastewater treatment works in Washburn, Marshall County, Illinois treating an average of 0.07 million gallons per day against a permitted design capacity of 1.13 MGD, serving about 1,095 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit IL0039411 (effective), which expires in July 2031, with 118 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 118
- Effluent violations
- 12
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Washburn STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Washburn STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Lacon · 9 mi away
0.14 MGD
Metamora · 9 mi away
0.25 MGD
Chillicothe · 10 mi away
0.34 MGD
Sparland · 10 mi away
—
Metamora · 10 mi away
0.09 MGD
Roanoke · 11 mi away
0.24 MGD
Minonk · 14 mi away
0.3 MGD
Metamora · 14 mi away
0.07 MGD
Washburn 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 September 11, 2026; facility record last updated November 6, 2025.