Spoon Valley Lake STP
205 Brookwood Lane, Dahinda, IL 61428 · Knox County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- ILG580202
- Effective
- Permit expires
- May 2027
- Population served
- 548
- CWNS 2022
Spoon Valley Lake STP is a publicly owned wastewater treatment works in Dahinda, Knox County, Illinois treating an average of 0.05 million gallons per day against a permitted design capacity of 0.25 MGD, serving about 548 residents. It discharges under NPDES permit ILG580202 (effective), which expires in May 2027, with 3 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Spoon Valley Lake STP.
Available with a free Klarifi account
See the full treatment train at Spoon Valley Lake STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Spoon Valley Lake STP.
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Nearby wastewater treatment plants in Illinois
Victoria · 6 mi away
0.01 MGD
Williamsfield · 6 mi away
0.07 MGD
Knoxville · 9 mi away
—
Wataga · 9 mi away
0.005 MGD
Wataga · 9 mi away
0.05 MGD
Oneida · 10 mi away
0.1 MGD
Oneida · 11 mi away
0.09 MGD
Maquon · 11 mi away
0.02 MGD
Spoon Valley Lake 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 26, 2026; facility record last updated April 23, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms