Oswego - C East Side STP
71 Mercer St, Oswego, NY 13126 · Oswego County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 5.35 MGD
- NPDES permit
- NY0029114
- Administratively continued
- Permit expires
- October 2019
- Population served
- 18,095
- CWNS 2022
Oswego - C East Side STP is a publicly owned wastewater treatment works in Oswego, Oswego County, New York, serving about 18,095 residents. It discharges under NPDES permit NY0029114 (administratively continued), which expires in October 2019, with 17 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in April 2009.
Treatment technology
One treatment structure or unit process identified at Oswego - C East Side STP.
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See the full treatment train at Oswego - C East Side STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Oswego - C East Side STP in EPA's ICIS system.
- Formal actions
- 3
- 0 since FY2020
- Penalties assessed
- $420
- all cases
- Compliance actions
- $2,500
- required by EPA orders
- EPA inspections
- 3
- latest Jul 2012
Latest case · Apr 2009
Eastside Wastewater Treatment Plant
Administrative order · CAA, Prevention of Accidental Release/Risk Management Plans (RMPs) · Final Order With Penalty · Penalty $420 · Compliance actions $2,000
EPA's description of the case:
“This is a penalty action for violations of CAA Sections 112r, Part 68. The Eastside Wastwater Treatment Plant had a RMP in place, however, there were deficiencies in the areas of process hazard…”
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Source: EPA ECHO, civil enforcement case 02-2009-1205.
Full case history with a free Klarifi account
Every action against Oswego - C East Side STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Oswego - C East Side STP.
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Nearby wastewater treatment plants in New York
Oswego · 2 mi away
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Minetto · 5 mi away
0.14 MGD
Oswego · 5 mi away
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Fulton · 10 mi away
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Mexico · 13 mi away
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Red Creek · 18 mi away
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Parish · 19 mi away
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Phoenix · 19 mi away
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Oswego - C East Side 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 May 21, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms