Post Oak WWTP
Sherman, TX · Grayson County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 16 MGD
- NPDES permit
- TX0024325
- Administratively continued
- Permit expires
- August 2025
- Population served
- 4,561
- CWNS 2022
Post Oak WWTP is a publicly owned wastewater treatment works in Sherman, Grayson County, Texas, serving about 4,561 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos, biogas balloons. It discharges under NPDES permit TX0024325 (administratively continued), which expires in August 2025, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Uncovered lagoons
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Biogas silos
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Biogas balloons
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Post Oak WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Post Oak WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Texas
Tom Bean · 8 mi away
0.18 MGD
Bells · 9 mi away
0.18 MGD
Denison · 10 mi away
0.46 MGD
Whitewright · 12 mi away
0.54 MGD
Savoy · 12 mi away
0.18 MGD
Van Alstyne · 12 mi away
0.98 MGD
Gunter · 13 mi away
0.1 MGD
Denison · 14 mi away
3.86 MGD
Post Oak WWTP: 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 August 7, 2026.