St. Marys Wastewater Plant
200 N 7th St, Saint Marys, KS 66536 · Pottawatomie County · Publicly Owned Treatment Works
- Average flow
- 0.17 MGD
- Design flow
- —
- NPDES permit
- KS0020974
- Effective
- Permit expires
- December 2030
- Population served
- 2,295
- CWNS 2022
St. Marys Wastewater Plant is a publicly owned wastewater treatment works in Saint Marys, Pottawatomie County, Kansas treating an average of 0.17 million gallons per day, serving about 2,295 residents. It discharges under NPDES permit KS0020974 (effective), which expires in December 2030, with 14 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at St. Marys Wastewater Plant.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 14
- Effluent violations
- 14
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at St. Marys Wastewater Plant.
No verified contacts on file yet
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Wamego · 12 mi away
0.52 MGD
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Silver Lake · 13 mi away
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St. Marys Wastewater Plant: 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 March 4, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms