Hennepin Power Station
13498 E 800th St, Hennepin, IL 61327 · Putnam County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.75 MGD
- NPDES permit
- IL0025313
- Effective
- Permit expires
- February 2030
- Population served
- —
- CWNS 2022
Hennepin Power Station is a publicly owned wastewater treatment plant in Hennepin, Putnam County, Illinois treating an average of 0.06 million gallons per day against a permitted design capacity of 0.75 MGD. It discharges under NPDES permit IL0025313 (effective), which expires in February 2030, with 0 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in May 2005.
Treatment technology
Treatment structures and unit processes at Hennepin Power Station.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Hennepin Power Station in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $9M
- all cases
- Compliance actions
- $500M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · May 2005
ILLINOIS POWER - BALDWIN
Judicial case · CAA, Implementation Plan for National Primary and Secondary Ambient Air Quality Standards · Litigated With Penalty · Penalty $9M · Compliance actions $500M
Source: EPA ECHO, civil enforcement case 05-1999-0751.
Full case history with a free Klarifi account
Every action against Hennepin Power Station with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Hennepin Power Station.
No verified contacts on file yet
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Nearby wastewater treatment plants in Illinois
Depue · 1 mi away
0.3 MGD
Bureau Junction · 3 mi away
0.04 MGD
Granville · 4 mi away
0.24 MGD
Spring Valley · 6 mi away
1.14 MGD
Ladd · 8 mi away
0.21 MGD
Dalzell · 8 mi away
0.04 MGD
Tiskilwa · 9 mi away
0.04 MGD
Cedar Point · 10 mi away
0.01 MGD
Hennepin Power Station: 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 October 20, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms