Clean Water Act discharge permit · NPDES MT0021857
MANHATTAN WWTF, Manhattan, MT: NPDES MT0021857 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
MANHATTAN WWTF, held by MANHATTAN CITY OF, holds NPDES permit MT0021857, which discharges to Dita Ditch To Gallatin River. EPA’s file records it issued February 26, 2004 and expiring March 31, 2009. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MANHATTAN WWTF |
|---|---|
| Permittee as filed | MANHATTAN CITY OF |
| NPDES ID | MT0021857 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | February 26, 2004 |
| Expiration date | March 31, 2009 |
| Issuing agency | MONTANA DEQ |
| Address | Manhattan, MT 59741 |
| Receiving water | DITA DITCH TO GALLATIN RIVER |
| Subwatershed | Gallatin River-Manhattan (HUC 100200081401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 13Under a numeric limit
- 16With a violation of any kind
- 9With 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 | 10 | 98 | 71 | June 30, 2025 | 1,871% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 67 | 47 | July 31, 2025 | 310% over the limit |
| BOD, 5-day, 20 deg. C | 10 | 60 | 36 | January 31, 2024 | 433% over the limit |
| Solids, suspended percent removal | 2 | 27 | 23 | May 31, 2023 | 567% over the limit |
| Coliform, fecal general | 8 | 24 | 19 | January 31, 2006 | 13,900% over the limit |
| E. coli, MTEC-MF | 0 | 20 | 15 | June 30, 2025 | 11,595% over the limit |
| BOD, 5-day, percent removal | 2 | 11 | 7 | May 31, 2023 | 107% over the limit |
| Nitrite + Nitrate total [as N] | 1 | 14 | 3 | August 31, 2020 | 45% over the limit |
| pH | 4 | 13 | 3 | December 31, 2005 | |
| Flow rate | 7 | 28 | 0 | ||
| Chlorine, total residual | 2 | 20 | 0 | ||
| Phosphorus, total [as P] | 1 | 14 | 0 | ||
| Nitrogen, total [as N] | 1 | 13 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 12 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 4 | 0 | ||
| Oil and grease, hexane extr method | 0 | 3 | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 26, 2023 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| January 26, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 26, 2023 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| January 26, 2023 | Management Practice Violations - Failure to Maintain Records | ST6 |
| December 7, 2018 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| December 7, 2018 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| December 7, 2018 | Reporting Violations - Improper/ Incorrect Reporting | 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 MT0021857 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.