Clean Water Act discharge permit · NPDES MN0024368
NORTHFIELD WWTP, Northfield, MN: NPDES MN0024368 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
NORTHFIELD WWTP, held by Northfield city of, holds NPDES permit MN0024368. EPA’s file records it issued May 1, 2022 and expiring May 31, 2025. 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 | NORTHFIELD WWTP |
|---|---|
| Permittee as filed | Northfield city of |
| NPDES ID | MN0024368 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 1, 2022 |
| Expiration date | May 31, 2025 |
| Issuing agency | STA |
| Address | Northfield, MN 55057 |
| Subwatershed | City of Northfield-Cannon River (HUC 070400020604) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MND985685395 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 18Pollutants on file
- 18Under a numeric limit
- 7With a violation of any kind
- 2With 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 | 7 | 6 | 6 | August 31, 2023 | 49% over the limit |
| Solids, suspended percent removal | 1 | 5 | 5 | August 31, 2021 | 533% over the limit |
| Nitrogen, total [as N] | 2 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 2 | 0 | ||
| Solids, total dissolved | 1 | 2 | 0 | ||
| Mercury, total [as Hg] | 1 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 8 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 6 | 0 | 0 | ||
| Phosphorus, total [as P] | 5 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Precipitation, total defined period/in | 1 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| Coliform, fecal MPN + membrane ftl 44.5 C | 1 | 0 | 0 | ||
| Mercury, dissolved [as Hg] | 1 | 0 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 1 | 0 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 22, 2019 | Effluent Violations - Unauthorized Discharge | ST6 |
| July 2, 2018 | Effluent Violations - Unauthorized Discharge | ST6 |
| May 29, 2018 | Effluent Violations - Unauthorized Discharge | ST6 |
| January 1, 2018 | Effluent Violations - Unauthorized Discharge | 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 MN0024368 there.
Nearby on the register
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- Every permit record in Minnesota, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.