Onaway Wwtp/city Of Onaway
21132 Spruce St, Onaway, MI 49765 · Presque Isle County · Publicly Owned Treatment Works
- Average flow
- 0.56 MGD
- Design flow
- —
- NPDES permit
- MI0055522
- Effective
- Permit expires
- October 2029
- Population served
- 1,059
- CWNS 2022
Onaway Wwtp/city Of Onaway is a publicly owned wastewater treatment works in Onaway, Presque Isle County, Michigan treating an average of 0.56 million gallons per day, serving about 1,059 residents. It discharges under NPDES permit MI0055522 (effective), which expires in October 2029, with 4 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Onaway Wwtp/city Of Onaway.
Available with a free Klarifi account
See the full treatment train at Onaway Wwtp/city Of Onaway: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 0
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 Onaway Wwtp/city Of Onaway in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 1
- none on record
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Onaway Wwtp/city Of Onaway with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Onaway Wwtp/city Of Onaway.
No verified contacts on file yet
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Nearby wastewater treatment plants in Michigan
Rogers City · 21 mi away
0.63 MGD
Cheboygan · 23 mi away
1.5 MGD
Petoskey · 36 mi away
1.11 MGD
Mackinaw City · 37 mi away
0.27 MGD
Boyne City · 38 mi away
0.54 MGD
Mackinac Island · 40 mi away
0.41 MGD
Alpena · 44 mi away
3.71 MGD
Saint Ignace · 45 mi away
0.71 MGD
Onaway Wwtp/city Of Onaway: 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 12, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms