Clean Water Act discharge permit · NPDES MI0042501
GUN LAKE WWTP, Shelbyville, MI: NPDES MI0042501 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 28Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
GUN LAKE WWTP, held by Gun Lake Area Sewer & Water Authority, holds NPDES permit MI0042501. EPA’s file records it issued November 4, 2011 and expiring October 1, 2015. 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 | GUN LAKE WWTP |
|---|---|
| Permittee as filed | Gun Lake Area Sewer & Water Authority |
| NPDES ID | MI0042501 |
| 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 | November 4, 2011 |
| Expiration date | October 1, 2015 |
| Issuing agency | State |
| Address | Shelbyville, MI 49344 |
| Subwatershed | Fenner Creek-Gun River (HUC 040500030702) |
| Program components on file | Biosolids, POTW |
| 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
- 33Pollutants on file
- 28Under a numeric limit
- 33With 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] | 14 | 249 | 4 | October 31, 2005 | 160% over the limit |
| pH | 2 | 30 | 2 | March 31, 2019 | |
| Solids, total suspended | 12 | 281 | 1 | March 31, 2021 | 49% over the limit |
| Coliform, fecal general | 2 | 23 | 1 | July 31, 2021 | 93% over the limit |
| Solids, suspended percent removal | 2 | 5 | 1 | March 31, 2021 | 489% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 12 | 384 | 0 | ||
| Cyanide [A] | 2 | 313 | 0 | ||
| Phosphorus, total [as P] | 2 | 288 | 0 | ||
| Mercury, total [as Hg] | 6 | 265 | 0 | ||
| Oxygen, dissolved [DO] | 3 | 55 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 24 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 22 | 0 | ||
| Solids, total | 3 | 21 | 0 | ||
| Arsenic, dry weight | 3 | 21 | 0 | ||
| Selenium, dry weight | 3 | 21 | 0 | ||
| Copper, dry weight | 3 | 21 | 0 | ||
| Cadmium, dry weight | 3 | 21 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 21 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 21 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 21 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 21 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 21 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 21 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 21 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 21 | 0 | ||
| Copper, total [as Cu] | 0 | 18 | 0 | ||
| Arsenic, total [as As] | 4 | 16 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 12 | 0 | ||
| Selenium, total [as Se] | 1 | 10 | 0 | ||
| Barium, total [as Ba] | 0 | 8 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 6 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 5 | 0 | ||
| Chlorine, total residual | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 21, 2025 | Reporting Violations - Late Submittal of DMRs | ST6 |
| February 16, 2022 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| June 30, 2021 | Management Practice Violations - Improper Operation and Maintenance | 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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Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.