Calvin Pwa
PO Box 368, Calvin, OK 74531 · Hughes County · Publicly Owned Treatment Works
- Average flow
- 0.0039 MGD
- Design flow
- 0.03 MGD
- NPDES permit
- OK0037818
- Effective
- Permit expires
- October 2027
- Population served
- 294
- CWNS 2022
Calvin Pwa is a publicly owned wastewater treatment plant in Calvin, Hughes County, Oklahoma treating an average of 0.0039 million gallons per day against a permitted design capacity of 0.03 MGD, serving about 294 residents. It discharges under NPDES permit OK0037818 (effective), which expires in October 2027, with 41 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Calvin Pwa.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 41
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Calvin Pwa.
No verified contacts on file yet
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Nearby wastewater treatment plants in Oklahoma
Stuart · 9 mi away
—
Holdenville · 12 mi away
0.6 MGD
Allen · 12 mi away
0.04 MGD
Wewoka · 19 mi away
0.38 MGD
Francis · 22 mi away
0.0015 MGD
Dustin · 24 mi away
—
Mcalester · 25 mi away
1.45 MGD
Weleetka · 26 mi away
0.1 MGD
Calvin Pwa: 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 July 18, 2023.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms