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Clean Water Act discharge permit · NPDES MNG585215

SERPENT LAKE WWTP, Crosby, MN: NPDES MNG585215 discharge permit, effluent exceedances, inspections, penalties

SERPENT LAKE WWTP, held by Serpent Lake Sanitary Sewer District, holds NPDES permit MNG585215. EPA’s file records it issued January 1, 2020 and expiring November 30, 2023.

SERPENT LAKE WWTP, Crosby, Minnesota: Coverage under a general permit MNG585215, held by Serpent Lake Sanitary Sewer District; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued January 1, 2020, term to November 30, 2023, by STA.

  • pH: 3 limits, 1 violation of any kind, 1 effluent exceedance, latest October 31, 2024.
  • Flow, in conduit or thru treatment plant: 9 limits, 0 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 6 limits, 0 violations of any kind, 0 effluent exceedances.
  • BOD, carbonaceous [5 day, 20 C]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, Kjeldahl, total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrite + Nitrate total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Precipitation, total defined period/in: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Coliform, fecal MPN + membrane ftl 44.5 C: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Solids, total dissolved: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Mercury, dissolved [as Hg]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Mercury, total [as Hg]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Minnesota holds 240 Publicly owned treatment works coverages of this permit type in EPA’s file; 13 were issued before MNG585215.

Coverages issued nearest MNG585215

  • January 1, 2020: HILLS WWTP, Hills, MNG585196, held by Hills city of
  • January 1, 2020: STEEN WWTP, Steen, MNG585199, held by Steen city of
  • January 1, 2020: WILMONT WWTP, Wilmont, MNG585200, held by Wilmont city of
  • January 1, 2020: RUSHMORE WWTP, Rushmore, MNG585201, held by Rushmore city of
  • January 1, 2020: REMER WWTP, Remer, MNG585210, held by Remer city of
  • January 1, 2020: SOBIESKI WWTP, Swan River, MNG585217, held by Sobieski city of
  • January 1, 2020: LEOTA SANITARY DISTRICT WWTP, Leota, MNG585219, held by Leota Sanitary District
  • January 1, 2020: FARWELL KENSINGTON SANITARY DISTRICT WWTP, Kensington, MNG585220, held by Farwell Kensington Sanitary District
  • January 1, 2020: WALTERS WWTP, Walters, MNG585223, held by Walters city of
  • January 1, 2020: BIGELOW WWTP, Bigelow, MNG585224, held by Bigelow city of

SERPENT LAKE WWTP among its neighbors

EPA’s permit file holds 1 discharge permits in the Rabbit River subwatershed (HUC 070101040503), MNG585215 among them. Its county holds 9, 2 of them major permits; MNG585215 is a minor permit.

Identity

Facility as filedSERPENT LAKE WWTP
Permittee as filedSerpent Lake Sanitary Sewer District
NPDES IDMNG585215
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJanuary 1, 2020
Expiration dateNovember 30, 2023
Issuing agencySTA
AddressCrosby, MN 56441
SubwatershedRabbit River (HUC 070101040503)
SIC4952 – Sewerage Systems

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH311October 31, 2024
Flow, in conduit or thru treatment plant900
Solids, total suspended600
BOD, carbonaceous [5 day, 20 C]500
Phosphorus, total [as P]400
Nitrogen, total [as N]200
Nitrogen, Kjeldahl, total [as N]200
Nitrite + Nitrate total [as N]200
Precipitation, total defined period/in100
Oxygen, dissolved [DO]100
Nitrogen, ammonia total [as N]100
Coliform, fecal MPN + membrane ftl 44.5 C100
Solids, total dissolved100
Mercury, dissolved [as Hg]100
Mercury, total [as Hg]100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MNG585215.

Inspections

EPA’s inspection file holds no inspection for NPDES MNG585215.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MNG585215.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES MNG585215 for the SERPENT LAKE WWTP in Crosby, MN, a publicly owned treatment works classed as a minor discharger, with its permit status listed as administratively continued. The register lists 15 pollutants on file, 15 of them under a numeric limit, and 1 pollutant with an effluent exceedance. The permit's issue and expiration dates are shown as January 1, 2020 and November 30, 2023, and the Rabbit River (HUC 070101040503) subwatershed is noted.