Shawneetown South STP
1/2 Mile So Of Rt 13 On C H 8, Shawneetown, IL 62984 · Gallatin County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- IL0021776
- Effective
- Permit expires
- November 2029
- Population served
- 1,568
- CWNS 2022
Shawneetown South STP is a publicly owned wastewater treatment works in Shawneetown, Gallatin County, Illinois treating an average of 0.04 million gallons per day against a permitted design capacity of 1.2 MGD, serving about 1,568 residents. It discharges under NPDES permit IL0021776 (effective), which expires in November 2029, with 8 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Shawneetown South STP.
Available with a free Klarifi account
See the full treatment train at Shawneetown South STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Shawneetown South STP.
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Nearby wastewater treatment plants in Illinois
Ridgway · 8 mi away
0.15 MGD
Equality · 8 mi away
—
New Haven · 15 mi away
0.02 MGD
Cave In Rock · 16 mi away
0.004 MGD
Elizabethtown · 18 mi away
0.0029 MGD
Muddy · 18 mi away
0.0091 MGD
Harrisburg · 19 mi away
1.37 MGD
Broughton · 22 mi away
0.02 MGD
Shawneetown South 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 September 11, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms