Clean Water Act discharge permit · NPDES MT0020389
MALTA SEWAGE TREATMENT LAGOONS, Malta, MT: NPDES MT0020389 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 18Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
MALTA SEWAGE TREATMENT LAGOONS, held by CITY OF MALTA, holds NPDES permit MT0020389, which discharges to Milk River. EPA’s file records it issued April 1, 2010 and expiring May 31, 2015. 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 | MALTA SEWAGE TREATMENT LAGOONS |
|---|---|
| Permittee as filed | CITY OF MALTA |
| NPDES ID | MT0020389 |
| 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 | April 1, 2010 |
| Expiration date | May 31, 2015 |
| Issuing agency | MONTANA DEQ |
| Address | Malta, MT 59538 |
| Receiving water | MILK RIVER |
| Subwatershed | Milk River-Malta (HUC 100500041901) |
| 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
- 20Pollutants on file
- 18Under a numeric limit
- 20With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 0 | 23 | 11 | October 31, 2009 | 1,400% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 62 | 8 | February 29, 2008 | 73% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 40 | 4 | October 31, 2010 | 264% over the limit |
| BOD, 5-day, percent removal | 2 | 12 | 3 | November 30, 2014 | 564% over the limit |
| Solids, total suspended | 7 | 56 | 2 | March 31, 2003 | 464% over the limit |
| Phosphorus, total [as P] | 3 | 28 | 0 | ||
| pH | 2 | 23 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 21 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 20 | 0 | ||
| E. coli, MTEC-MF | 9 | 18 | 0 | ||
| Flow rate | 2 | 18 | 0 | ||
| Nitrogen, total [as N] | 3 | 14 | 0 | ||
| Temperature, water deg. fahrenheit | 1 | 14 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 13 | 0 | ||
| Chlorine, total residual | 1 | 10 | 0 | ||
| Solids, suspended percent removal | 1 | 8 | 0 | ||
| Salinity | 1 | 7 | 0 | ||
| Chloride [as Cl] | 1 | 7 | 0 | ||
| Solids, total dissolved | 1 | 7 | 0 | ||
| Oil and grease, hexane extr method | 1 | 4 | 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 |
|---|---|---|
| March 16, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| March 16, 2022 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| March 16, 2022 | Monitoring Violations - Analysis not Conducted | ST6 |
| April 24, 2017 | Management Practice Violations - Improper Operation and Maintenance | 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.
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 MT0020389 there.
Nearby on the register
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- Every permit record in Malta, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.