Clean Water Act discharge permit · NPDES MIG490331
GRAYMONT-EASTERN QUARRY, Naubinway, MI: NPDES MIG490331 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
GRAYMONT-EASTERN QUARRY, held by Graymont (MI) LLC, holds NPDES permit MIG490331. EPA’s file records it issued September 25, 2018 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 | GRAYMONT-EASTERN QUARRY |
|---|---|
| Permittee as filed | Graymont (MI) LLC |
| NPDES ID | MIG490331 |
| 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 | Not a publicly owned treatment works |
| Issued | September 25, 2018 |
| Expiration date | April 1, 2020 |
| Issuing agency | State |
| Address | Naubinway, MI 49762 |
| Subwatershed | South Branch Hendrie River (HUC 040202020302) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 5Pollutants on file
- 5Under a numeric limit
- 5With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 16 | 0 | ||
| pH | 2 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 8 | 0 | ||
| Solids, total dissolved | 1 | 4 | 0 | ||
| Outfall observation,visual, y/n response | 1 | 4 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MIG490331.
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 |
|---|---|---|
| March 21, 2026 | Reporting Violations - Late Submittal of DMRs | ST6 |
| February 21, 2026 | Reporting Violations - Late Submittal of DMRs | ST6 |
| July 21, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| July 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.
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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 MIG490331 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.