Clean Water Act discharge permit · NPDES MI0055522
ONAWAY WWTP, Onaway, MI: NPDES MI0055522 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 24Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ONAWAY WWTP, held by City of Onaway, holds NPDES permit MI0055522, which discharges to Bowen Creek. EPA’s file records it issued December 21, 2018 and expiring October 1, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ONAWAY WWTP |
|---|---|
| Permittee as filed | City of Onaway |
| NPDES ID | MI0055522 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 21, 2018 |
| Expiration date | October 1, 2023 |
| Issuing agency | State |
| Address | Onaway, MI 49765 |
| Receiving water | Bowen Creek |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Bowen Creek-Black River (HUC 040700050213) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MIK869913034 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 24Pollutants on file
- 24Under a numeric limit
- 24With a violation of any kind
- 5With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 6 | 357 | 13 | August 31, 2019 | 47% over the limit |
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 20 | 3 | April 30, 2020 | 17% over the limit |
| Solids, suspended percent removal | 2 | 18 | 2 | April 30, 2014 | 15% over the limit |
| Oxygen, dissolved [DO] | 1 | 17 | 2 | May 31, 2007 | 56% over the limit |
| pH | 2 | 31 | 1 | December 31, 2014 | |
| BOD, carbonaceous [5 day, 20 C] | 4 | 292 | 0 | ||
| Solids, total suspended | 4 | 288 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 37 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 30 | 0 | ||
| Coliform, fecal general | 2 | 30 | 0 | ||
| Solids, total | 3 | 3 | 0 | ||
| Arsenic, dry weight | 3 | 3 | 0 | ||
| Selenium, dry weight | 3 | 3 | 0 | ||
| Copper, dry weight | 3 | 3 | 0 | ||
| Cadmium, dry weight | 3 | 3 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 3 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 3 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 3 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 3 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 3 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 3 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 3 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 15, 2024 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| July 23, 2021 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| September 9, 2019 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| September 21, 2018 | Reporting Violations - Late Submittal of DMRs | ST6 |
| August 21, 2018 | Reporting Violations - Late Submittal of DMRs | ST6 |
| October 31, 2017 | Reporting Violations - Late Submittal of DMRs | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MI0055522 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.