NPDES MI0055531 · Clean Water Act
STP NO. 2 GWCU-LUDINGTON, Ludington, MI: NPDES MI0055531 discharge permit, effluent exceedances, inspections, penalties
STP NO. 2 GWCU-LUDINGTON, Ludington, Michigan: Individual permit MI0055531, held by Northrop Grumman Systems Corporation; Administratively continued; issued December 16, 2016, term to October 1, 2020, by State; discharges to Lincoln Lake.
- Trichloroethylene: 2 limits, 49 violations of any kind, 1 effluent exceedance, latest December 31, 2019, largest 18% over the limit.
- 1,2-cis-Dichloroethylene: 0 limits, 76 violations of any kind.
- pH: 2 limits, 46 violations of any kind.
- Flow, in conduit or thru treatment plant: 2 limits, 46 violations of any kind.
- Dichloroethene, total: 2 limits, 46 violations of any kind.
- cis-1,2-Dichloroethene: 0 limits, 38 violations of any kind.
- Outfall observation,visual, y/n response: 1 limit, 28 violations of any kind.
- Equipment inspection - visual: 1 limit, 27 violations of any kind.
- Cyanide [A]: 0 limits, 25 violations of any kind.
- 1,1-Dichloroethylene: 0 limits, 2 violations of any kind.
- trans-1,2-Dichloroethylene: 0 limits, 2 violations of any kind.
- Vinyl chloride: 0 limits, 2 violations of any kind.
- March 31, 2026: Letter of Violation/ Warning Letter (State).
STP NO. 2 GWCU-LUDINGTON among its neighbors
6 discharge permits are in the Lincoln Lake-Lincoln River subwatershed (HUC 040601010203); MI0055531 is one. Its county: 11, 2 major; MI0055531 is minor permit.
Other permits in the Lincoln Lake-Lincoln River subwatershed (HUC 040601010203)
- ELMERS CONCRETE OF LUDINGTON, Ludington: MIS111695, minor, term to 2026-03-31
- FLORACRAFT, Ludington: MIG250191, minor, term to 2023-04-01
- GREAT LAKES CASTINGS, Ludington: MIG250189, minor, term to 2023-04-01
- PADNOS-PERE MARQUETTE DIV, Ludington: MIS120646, minor, term to 2026-04-01
- STRAITS STEEL & WIRE - LUDINGTON, Ludington: MI0059187, minor, term to 2025-10-01
Identity
| Facility | STP NO. 2 GWCU-LUDINGTON |
|---|---|
| Permittee | Northrop Grumman Systems Corporation |
| NPDES ID | MI0055531 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Minor |
| Facility type | Non-POTW |
| Issued | December 16, 2016 |
| Expires | October 1, 2020 |
| Agency | State |
| Address | Ludington, MI 49431 |
| Receiving water | Lincoln Lake |
| Subwatershed | Lincoln Lake-Lincoln River (HUC 040601010203) |
NPDES MI0055531: effluent limits and exceedances
STP NO. 2 GWCU-LUDINGTON (NPDES MI0055531): 12 pollutants on file, 6 limited; 12 with a violation of any kind, 1 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Trichloroethylene | 2 | 49 | 1 | December 31, 2019 | 18% over the limit |
| 1,2-cis-Dichloroethylene | 0 | 76 | 0 | ||
| pH | 2 | 46 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 46 | 0 | ||
| Dichloroethene, total | 2 | 46 | 0 | ||
| cis-1,2-Dichloroethene | 0 | 38 | 0 | ||
| Outfall observation,visual, y/n response | 1 | 28 | 0 | ||
| Equipment inspection - visual | 1 | 27 | 0 | ||
| Cyanide [A] | 0 | 25 | 0 | ||
| 1,1-Dichloroethylene | 0 | 2 | 0 | ||
| trans-1,2-Dichloroethylene | 0 | 2 | 0 | ||
| Vinyl chloride | 0 | 2 | 0 |
NPDES MI0055531: inspections, violations and enforcement
NPDES MI0055531: 1 informal enforcement action
| Date | What EPA recorded | Agency |
|---|---|---|
| March 31, 2026 | Letter of Violation/ Warning Letter | State |
NPDES MI0055531 (STP NO. 2 GWCU-LUDINGTON): no single-event violation, inspection and formal enforcement action on file.
Watch NPDES MI0055531
NPDES MI0055531: one email when its EPA record changes — $99/month.
Permits near NPDES MI0055531
NPDES MI0055531: 12 pollutant rows, 1 dated events; ICIS-NPDES download, loaded September 15, 2026.