Clean Water Act discharge permit · NPDES MT0000442
GREAT FALLS WTP, Great Falls, MT: NPDES MT0000442 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
GREAT FALLS WTP, held by CITY OF GREAT FALLS, holds NPDES permit MT0000442, which discharges to Missouri River. EPA’s file records it issued December 6, 2017 and expiring January 31, 2023. 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 | GREAT FALLS WTP |
|---|---|
| Permittee as filed | CITY OF GREAT FALLS |
| NPDES ID | MT0000442 |
| 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 | December 6, 2017 |
| Expiration date | January 31, 2023 |
| Address | Great Falls, MT 59405 |
| Receiving water | MISSOURI RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Missouri River-Great Falls (HUC 100301021201) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 14Under a numeric limit
- 9With a violation of any kind
- 3With 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 | 4 | 28 | 27 | July 31, 2018 | 10,833% over the limit |
| Chlorine, total residual | 4 | 20 | 19 | May 31, 2008 | 266% over the limit |
| Aluminum, dissolved [as Al] | 4 | 4 | 1 | December 31, 2010 | 3% over the limit |
| Nitrogen, total [as N] | 4 | 10 | 0 | ||
| pH | 4 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 2 | 0 | ||
| Trihalomethane, tot. | 1 | 2 | 0 | ||
| Turbidity | 0 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 1 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Oil and grease, hexane extr method | 1 | 0 | 0 | ||
| N-Nitrosodimethylamine [NDMA] | 1 | 0 | 0 | ||
| Haloacetic acids [HAA5] | 1 | 0 | 0 | ||
| Solids, total dissolved [TDS] | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 12, 2017 | Management Practice Violations - Failure to Maintain Records | ST6 |
| December 12, 2017 | Monitoring Violations - Improper Analysis or Lab Error | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MT0000442.
Start the watch
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- One watershed — $2,990/year
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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 MT0000442 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.