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Clean Water Act discharge permit · NPDES MNG585379

OSLO WWTP, Oslo, MN: NPDES MNG585379 discharge permit, effluent exceedances, inspections, penalties

OSLO WWTP, held by Oslo city of, holds NPDES permit MNG585379. EPA’s file records it issued December 1, 2020 and expiring November 30, 2023.

OSLO WWTP, Oslo, Minnesota: Coverage under a general permit MNG585379, held by Oslo city of; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued December 1, 2020, term to November 30, 2023, by STA.

  • Coliform, fecal MPN + membrane ftl 44.5 C: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2022, largest 1,110% over the limit.
  • Flow, in conduit or thru treatment plant: 9 limits, 0 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 5 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.
  • pH: 3 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 3 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.
  • Solids, total dissolved: 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; 144 were issued before MNG585379.

Coverages issued nearest MNG585379

  • December 1, 2020: ROUND LAKE WWTP, Round Lake, MNG585198, held by Round Lake city of
  • December 1, 2020: SARGEANT WWTP, Sargeant, MNG585214, held by Sargeant city of
  • December 1, 2020: CONGER WWTP, Conger, MNG585222, held by Conger city of
  • December 1, 2020: HOLLANDALE WWTP, Hollandale, MNG585374, held by Hollandale city of
  • December 1, 2020: HENDRICKS WWTP, Hendricks, MNG585377, held by Hendricks city of
  • December 1, 2020: WALTHAM WWTP, Waltham, MNG585380, held by Waltham city of
  • January 1, 2021: MCKINLEY WWTP, Mckinley, MNG585367, held by McKinley city of
  • March 1, 2021: CHOKIO WWTP, Chokio, MNG585007, held by Chokio city of
  • March 1, 2021: FREEBORN WWTP, Freeborn, MNG585018, held by Freeborn city of
  • March 1, 2021: ECHO WWTP, Echo, MNG585059, held by Echo city of

OSLO WWTP among its neighbors

EPA’s permit file holds 2 discharge permits in the City of Oslo-Red River subwatershed (HUC 090203060601), MNG585379 among them. Its county holds 17, 0 of them major permits; MNG585379 is a minor permit.

Other permits in the City of Oslo-Red River subwatershed (HUC 090203060601)

  • OSLO_WWTF, Oslo: MN0024431, minor permit, discharging to RED R OTN, permit term to November 30, 2013

Identity

Facility as filedOSLO WWTP
Permittee as filedOslo city of
NPDES IDMNG585379
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
IssuedDecember 1, 2020
Expiration dateNovember 30, 2023
Issuing agencySTA
AddressOslo, MN 56744
Receiving water impaired303(D) Listed
SubwatershedCity of Oslo-Red River (HUC 090203060601)

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
Coliform, fecal MPN + membrane ftl 44.5 C111May 31, 20221,110% over the limit
Flow, in conduit or thru treatment plant900
Solids, total suspended500
BOD, carbonaceous [5 day, 20 C]500
pH300
Phosphorus, total [as P]300
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
Solids, total dissolved100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MNG585379.

Inspections

EPA’s inspection file holds no inspection for NPDES MNG585379.

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 MNG585379.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers NPDES permit MNG585379 for the OSLO WWTP in Oslo, MN, held by Oslo city of and administratively continued, with a Minor discharger classification. The page lists 13 pollutants on file, 1 under a numeric limit, and 1 with an effluent exceedance.