Clean Water Act discharge permit · NPDES MT0020401
THREE FORKS DOMESTIC WWTF, Three Forks, MT: NPDES MT0020401 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 21Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
THREE FORKS DOMESTIC WWTF, held by CITY OF THREE FORKS, holds NPDES permit MT0020401, which discharges to Madison River. EPA’s file records it issued February 20, 2015 and expiring March 31, 2020. 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 | THREE FORKS DOMESTIC WWTF |
|---|---|
| Permittee as filed | CITY OF THREE FORKS |
| NPDES ID | MT0020401 |
| 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 20, 2015 |
| Expiration date | March 31, 2020 |
| Address | Three Forks, MT 59752 |
| Receiving water | MADISON RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Madison River-Three Forks (HUC 100200071505) |
| 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
- 30Pollutants on file
- 21Under a numeric limit
- 29With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| E. coli, MTEC-MF | 12 | 55 | 50 | December 31, 2016 | 99,999% over the limit |
| Solids, suspended percent removal | 3 | 40 | 38 | May 31, 2026 | 933% over the limit |
| BOD, 5-day, 20 deg. C | 16 | 31 | 19 | September 30, 2019 | 60% over the limit |
| Solids, total suspended | 16 | 22 | 11 | July 31, 2015 | 100% over the limit |
| BOD, 5-day, percent removal | 3 | 11 | 9 | March 31, 2014 | 253% over the limit |
| pH | 10 | 12 | 4 | May 31, 2012 | |
| Arsenic, total recoverable | 3 | 14 | 0 | ||
| Nitrite + Nitrate total [as N] | 3 | 12 | 0 | ||
| Phosphorus, total [as P] | 4 | 8 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 8 | 0 | ||
| Nitrogen, total [as N] | 3 | 6 | 0 | ||
| Specific conductance | 0 | 4 | 0 | ||
| Chloride [as Cl] | 0 | 4 | 0 | ||
| Lead, dissolved [as Pb] | 0 | 4 | 0 | ||
| Water level at sample collection time | 0 | 4 | 0 | ||
| Flow rate | 12 | 3 | 0 | ||
| Copper, total recoverable | 5 | 3 | 0 | ||
| Temperature, water deg. centigrade | 2 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 3 | 2 | 0 | ||
| Lead, total recoverable | 3 | 2 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 3 | 2 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 3 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 2 | 0 | ||
| Flow rate | 0 | 2 | 0 | ||
| Copper, dissolved [as Cu] | 0 | 2 | 0 | ||
| Oil and grease, hexane extr method | 2 | 1 | 0 | ||
| Oil & Grease | 0 | 1 | 0 | ||
| Arsenic, dissolved [as As] | 0 | 1 | 0 | ||
| Oil and grease visual | 0 | 1 | 0 | ||
| Report due [yrmoda] | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 11, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 11, 2025 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 20, 2021 | 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.
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, MT0020401.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/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 MT0020401 there.
Nearby on the register
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- Every permit record in Three Forks, A to Z
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.