Clean Water Act discharge permit · NPDES MN0021431
THIEF RIVER FALLS WWTP, Thief River Falls, MN: NPDES MN0021431 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 23Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
THIEF RIVER FALLS WWTP, held by Thief River Falls WWTP, holds NPDES permit MN0021431, which discharges to Red L R Via Dt 70. EPA’s file records it issued November 24, 2010 and expiring October 31, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | THIEF RIVER FALLS WWTP |
|---|---|
| Permittee as filed | Thief River Falls WWTP |
| NPDES ID | MN0021431 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 24, 2010 |
| Expiration date | October 31, 2015 |
| Address | Thief River Falls, MN 56701 |
| Receiving water | RED L R VIA DT 70 |
| Subwatershed | City of Thief River Falls-Red Lake River (HUC 090203030301) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 24Pollutants on file
- 23Under a numeric limit
- 24With a violation of any kind
- 7With 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 | 9 | 31 | 13 | November 30, 2024 | 1,370% over the limit |
| Mercury, total [as Hg] | 5 | 16 | 8 | June 30, 2015 | 478% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 9 | 21 | 3 | June 30, 2021 | 52% over the limit |
| pH | 5 | 13 | 3 | May 31, 2016 | |
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 9 | 3 | December 31, 2012 | 207% over the limit |
| Solids, suspended percent removal | 2 | 9 | 3 | June 30, 2021 | 227% over the limit |
| Coliform, fecal MPN + membrane ftl 44.5 C | 2 | 3 | 3 | May 31, 2022 | 145% over the limit |
| Phosphorus, total [as P] | 5 | 9 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 6 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 5 | 0 | ||
| Flow, in conduit or thru treatment plant | 11 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 4 | 0 | ||
| Bicarbonate ion- [as HCO3] | 2 | 4 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 4 | 0 | ||
| Calcium, total [as Ca] | 2 | 4 | 0 | ||
| Magnesium, total [as Mg] | 2 | 4 | 0 | ||
| Sodium, total [as Na] | 2 | 4 | 0 | ||
| Potassium, total [as K] | 2 | 4 | 0 | ||
| Chloride [as Cl] | 2 | 4 | 0 | ||
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | 2 | 4 | 0 | ||
| Specific conductance | 1 | 2 | 0 | ||
| Precipitation, total defined period/in | 1 | 2 | 0 | ||
| Sulfate, total [as SO4] | 1 | 2 | 0 | ||
| Nitrogen, total [as N] | 0 | 2 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 27, 2021 | Effluent Violations - Unauthorized Discharge | ST6 |
| April 16, 2021 | Pretreatment - Failure to Establish Self-Monitoring Requirements | ST6 |
| April 16, 2021 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| July 16, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| June 28, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| September 21, 2019 | Effluent Violations - Unauthorized Discharge | ST6 |
| December 31, 2018 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| March 20, 2018 | Effluent Violations - Unauthorized Discharge | ST6 |
| December 15, 2017 | 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 MN0021431 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.