Clean Water Act discharge permit · NPDES MIG580104
THORNAPPLE TWP-DUNCAN LK WWSL, Middleville, MI: NPDES MIG580104 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 22Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
THORNAPPLE TWP-DUNCAN LK WWSL, held by Thornapple Township, holds NPDES permit MIG580104, which discharges to Duncan Creek. EPA’s file records it issued September 3, 2020 and expiring April 1, 2024. 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 | THORNAPPLE TWP-DUNCAN LK WWSL |
|---|---|
| Permittee as filed | Thornapple Township |
| NPDES ID | MIG580104 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 3, 2020 |
| Expiration date | April 1, 2024 |
| Issuing agency | State |
| Address | Middleville, MI 49333 |
| Receiving water | Duncan Creek |
| Subwatershed | Duncan Creek (HUC 040500070405) |
| 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
- 22Pollutants on file
- 22Under a numeric limit
- 22With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 2 | 60 | 22 | May 31, 2021 | 140% over the limit |
| Phosphorus, total [as P] | 2 | 22 | 3 | May 31, 2021 | 118% over the limit |
| Solids, total suspended | 4 | 41 | 2 | May 31, 2020 | 8% over the limit |
| Oxygen, dissolved [DO] | 1 | 18 | 1 | April 30, 2004 | 2% over the limit |
| Coliform, fecal general | 2 | 43 | 0 | ||
| pH | 2 | 37 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 36 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 19 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 21, 2019 | Reporting Violations - Late Submittal of DMRs | ST6 |
| January 21, 2019 | Reporting Violations - Late Submittal of DMRs | ST6 |
| April 21, 2018 | Reporting Violations - Late Submittal of DMRs | ST6 |
| January 21, 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.
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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 MIG580104 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.