Clean Water Act discharge permit · NPDES MI0028304
ONSTED WWTP, Onsted, MI: NPDES MI0028304 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 23Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ONSTED WWTP, held by Village of Onsted, holds NPDES permit MI0028304. EPA’s file records it issued December 22, 2016 and expiring October 1, 2022. 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 | ONSTED WWTP |
|---|---|
| Permittee as filed | Village of Onsted |
| NPDES ID | MI0028304 |
| 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 22, 2016 |
| Expiration date | October 1, 2022 |
| Issuing agency | State |
| Address | Onsted, MI 49265 |
| Subwatershed | Wolf Creek (HUC 041000020204) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 25Pollutants on file
- 23Under a numeric limit
- 25With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 10 | 81 | 5 | April 30, 2009 | 21% over the limit |
| Mercury, total [as Hg] | 6 | 115 | 4 | November 30, 2013 | 106% over the limit |
| pH | 2 | 41 | 3 | April 30, 2023 | |
| Oxygen, dissolved [DO] | 1 | 21 | 2 | May 31, 2024 | 42% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 12 | 101 | 1 | May 31, 2025 | 22% over the limit |
| Phosphorus, total [as P] | 4 | 110 | 0 | ||
| Solids, total suspended | 12 | 56 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 38 | 0 | ||
| Coliform, fecal general | 2 | 38 | 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 | ||
| Chloride [as Cl] | 0 | 1 | 0 | ||
| Sulfate, total [as SO4] | 0 | 1 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 21, 2026 | Reporting Violations - Late Submittal of DMRs | ST6 |
| June 21, 2025 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 27, 2025 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| April 21, 2025 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 22, 2024 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| May 20, 2024 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| March 21, 2023 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 21, 2019 | Reporting Violations - Late Submittal of DMRs | ST6 |
| January 21, 2019 | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MI0028304.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MI0028304 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.