Buffalo, Dawson, Mechanicsburg Sewer Commission STP
Buffalo, IL 62515 · Sangamon County · Publicly Owned Treatment Works
- Average flow
- 0.21 MGD
- 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 treating an average of 0.21 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 995 residents. It discharges under NPDES permit ILG580167 (effective), which expires in May 2027, with 65 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified at Buffalo, Dawson, Mechanicsburg Sewer Commission STP.
Available with a free Klarifi account
See the full treatment train at Buffalo, Dawson, Mechanicsburg Sewer Commission STP: structures, unit processes and planned upgrades, with exact unit counts.
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
16.41 MGD
Riverton · 6 mi away
0.24 MGD
Athens · 9 mi away
0.22 MGD
Williamsville · 9 mi away
0.22 MGD
New Berlin · 15 mi away
0.22 MGD
Petersburg · 16 mi away
0.31 MGD
Loami · 16 mi away
0.06 MGD
Pawnee · 17 mi away
0.21 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 October 26, 2026; facility record last updated October 10, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms