Buffalo, Dawson, Mechanicsburg Sewer Commission STP
Buffalo, IL · Sangamon County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.5 MGD
- NPDES permit
- ILG580167
- Effective
- Permit expires
- May 2027
- Population served
- 995
- CWNS 2022
Buffalo, Dawson, Mechanicsburg Sewer Commission STP is a publicly owned wastewater treatment works in Buffalo, Sangamon County, Illinois, serving about 995 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit ILG580167 (effective), which expires in May 2027, with 65 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 65
- Effluent violations
- 65
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Buffalo, Dawson, Mechanicsburg Sewer Commission STP.
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Nearby wastewater treatment plants in Illinois
Springfield · 1 mi away
7.59 MGD
Springfield · 4 mi away
3.95 MGD
Riverton · 6 mi away
0.15 MGD
Athens · 9 mi away
0.11 MGD
Williamsville · 9 mi away
0.12 MGD
New Berlin · 15 mi away
0.06 MGD
Petersburg · 16 mi away
0.14 MGD
Loami · 16 mi away
0.02 MGD
Buffalo, Dawson, Mechanicsburg Sewer Commission 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 May 17, 2025.