Clean Water Act discharge permit · NPDES MIG640229
ISLE ROYALE NP-MOTT ISLAND WTP, Houghton, MI: NPDES MIG640229 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
ISLE ROYALE NP-MOTT ISLAND WTP, held by Isle Royale National Park, holds NPDES permit MIG640229, which discharges to Lake Superior. EPA’s file records it issued April 9, 2015 and expiring April 1, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ISLE ROYALE NP-MOTT ISLAND WTP |
|---|---|
| Permittee as filed | Isle Royale National Park |
| NPDES ID | MIG640229 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Issued | April 9, 2015 |
| Expiration date | April 1, 2020 |
| Issuing agency | State |
| Address | Houghton, MI 49931 |
| Receiving water | Lake Superior |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 6Under a numeric limit
- 6With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 2 | 6 | 0 | ||
| Solids, total suspended | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Chloride [as Cl] | 1 | 3 | 0 | ||
| Sulfate, total [as SO4] | 1 | 3 | 0 | ||
| Outfall observation,visual, y/n response | 1 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MIG640229.
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 |
|---|---|---|
| November 21, 2025 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 21, 2025 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 21, 2024 | Reporting Violations - Late Submittal of DMRs | ST6 |
| June 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| May 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| April 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| March 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| February 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| December 21, 2022 | 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, MIG640229.
Start the watch
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- One watershed — $2,990/year
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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 MIG640229 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.