Clean Water Act discharge permit · NPDES MNG585093
CLARKFIELD WWTP, Clarkfield, MN: NPDES MNG585093 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
CLARKFIELD WWTP, held by Clarkfield city of, holds NPDES permit MNG585093. EPA’s file records it issued December 1, 2020 and expiring November 30, 2023. 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 | CLARKFIELD WWTP |
|---|---|
| Permittee as filed | Clarkfield city of |
| NPDES ID | MNG585093 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 1, 2020 |
| Expiration date | November 30, 2023 |
| Issuing agency | STA |
| Address | Clarkfield, MN 56223 |
| Subwatershed | Upper County Ditch No 9 (HUC 070200040101) |
| 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
- 16Pollutants on file
- 15Under a numeric limit
- 12With 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 | 16 | 6 | June 30, 2023 | 151% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 5 | 11 | 1 | April 30, 2022 | 24% over the limit |
| Nitrogen, total [as N] | 2 | 11 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 11 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 10 | 0 | ||
| Mercury, total [as Hg] | 3 | 9 | 0 | ||
| Phosphorus, total [as P] | 4 | 8 | 0 | ||
| pH | 3 | 6 | 0 | ||
| Mercury, dissolved [as Hg] | 2 | 4 | 0 | ||
| Solids, total dissolved | 1 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Sulfate, total [as SO4] | 0 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 9 | 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 |
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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 31, 2025 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES MNG585093.
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 MNG585093.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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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 MNG585093 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.