NPDES MT0020249 · Clean Water Act
JOLIET WWTP, Joliet, MT: NPDES MT0020249 discharge permit, effluent exceedances, inspections, penalties
JOLIET WWTP, Joliet, Montana: Individual permit MT0020249, held by TOWN OF JOLIET; Publicly owned treatment works; Administratively continued; issued May 18, 2015, term to June 30, 2020; discharges to ROCK CREEK.
- Solids, total suspended: 9 limits, 105 violations of any kind, 29 effluent exceedances, latest May 31, 2026, largest 129% over the limit.
- Nitrogen, ammonia total [as N]: 2 limits, 31 violations of any kind, 26 effluent exceedances, latest April 30, 2026, largest 320% over the limit.
- E. coli, MTEC-MF: 8 limits, 33 violations of any kind, 22 effluent exceedances, latest April 30, 2015, largest 99,999% over the limit.
- Solids, suspended percent removal: 2 limits, 22 violations of any kind, 19 effluent exceedances, latest May 31, 2026, largest 153% over the limit.
- BOD, 5-day, 20 deg. C: 9 limits, 93 violations of any kind, 17 effluent exceedances, latest May 31, 2023, largest 202% over the limit.
- BOD, 5-day, percent removal: 2 limits, 17 violations of any kind, 14 effluent exceedances, latest May 31, 2017, largest 345% over the limit.
- pH: 4 limits, 9 violations of any kind, 4 effluent exceedances, latest July 31, 2021.
- Coliform, fecal general: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest October 31, 1999, largest 99,999% over the limit.
- Flow rate: 2 limits, 138 violations of any kind.
- Nitrite + Nitrate total [as N]: 3 limits, 11 violations of any kind.
- Chlorine, total residual: 6 limits, 9 violations of any kind.
- Nitrogen, total [as N]: 5 limits, 8 violations of any kind.
- Temperature, water deg. centigrade: 3 limits, 7 violations of any kind.
- Phosphorus, total [as P]: 5 limits, 6 violations of any kind.
- Oil and grease, hexane extr method: 1 limit, 4 violations of any kind.
- Nitrogen, Kjeldahl, total [as N]: 3 limits, 3 violations of any kind.
- Solids, total dissolved [TDS]: 0 limits, 2 violations of any kind.
- Report due [yrmoda]: 1 limit, 1 violation of any kind.
- Oxygen, dissolved [DO]: 0 limits, 1 violation of any kind.
- July 10, 2026: Letter of Violation/ Warning Letter (State).
- June 10, 2026: Letter of Violation/ Warning Letter (State).
- May 8, 2026: Letter of Violation/ Warning Letter (State).
- April 10, 2026: Letter of Violation/ Warning Letter (State).
- March 12, 2026: Letter of Violation/ Warning Letter (State).
- February 10, 2026: Letter of Violation/ Warning Letter (State).
Montana holds 123 Publicly owned treatment works coverages of this permit type in EPA’s file; 92 were issued before MT0020249.
Coverages issued nearest MT0020249
- 2014-11-01: CITY OF BOZEMAN WTP, Bozeman: MT0030155, held by CITY OF BOZEMAN
- 2015-01-16: YELLOWSTONE BOYS AND GIRLS RANCH COUNTY WATER SEWER DISTRICT, Billings: MT0020460, held by YELLOWSTONE BOYS AND GIRLS RANCH COUNTY WATER/SEWER DISTRICT
- 2015-01-20: TWIN BRIDGES WWTF, Twin Bridges: MT0028797, held by TOWN OF TWIN BRIDGES
- 2015-02-20: THREE FORKS DOMESTIC WWTF, Three Forks: MT0020401, held by CITY OF THREE FORKS
- 2015-02-25: CITY OF LIBBY WTP, Libby: MT0030341, held by CITY OF LIBBY
- 2015-05-29: GARDINER WASTEWATER TREATMENT FACILITY, Gardiner: MT0022705, held by GARDINER AND PARK COUNTY WATER AND SEWER DIST
- 2015-07-07: WHITE SULPHUR SPRINGS WWTF, White Sulphur Springs: MT0020699, held by CITY OF WHITE SULPHUR SPRINGS
- 2016-01-06: TOWN OF VALIER WWTF, Valier: MT0021792, held by TOWN OF VALIER
- 2016-03-04: RED LODGE WWTF, Red Lodge: MT0020478, held by CITY OF RED LODGE
- 2016-05-09: LAUREL TRAVEL CENTER, Laurel: MT0031879, held by TA OPERATING LLC
JOLIET WWTP among its neighbors
4 discharge permits are in the Rock Creek-Cow Creek subwatershed (HUC 100700060908); MT0020249 is one. Its county: 66, 1 major; MT0020249 is minor permit.
Other permits in the Rock Creek-Cow Creek subwatershed (HUC 100700060908)
- EXXONMOBIL PIPELINE CO - ROCK CREEK PIPELINE REMOVAL PROJECT, Joliet: MTR104724, minor, term to 2012-12-31
- JOLIET WATER STORAGE TANK, Joliet: MTR111287, minor, term to 2027-12-31
- NELCON - ROCKVALE NORTH (US 212/310, Rockvale: MTG070772
Identity
| Facility | JOLIET WWTP |
|---|---|
| Permittee | TOWN OF JOLIET |
| NPDES ID | MT0020249 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Minor |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 18, 2015 |
| Expires | June 30, 2020 |
| Address | Joliet, MT 59041 |
| Receiving water | ROCK CREEK |
| Subwatershed | Rock Creek-Cow Creek (HUC 100700060908) |
| SIC | 4952 – Sewerage Systems |
NPDES MT0020249: effluent limits and exceedances
JOLIET WWTP (NPDES MT0020249): 19 pollutants on file, 16 limited; 19 with a violation of any kind, 8 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 9 | 105 | 29 | May 31, 2026 | 129% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 31 | 26 | April 30, 2026 | 320% over the limit |
| E. coli, MTEC-MF | 8 | 33 | 22 | April 30, 2015 | 99,999% over the limit |
| Solids, suspended percent removal | 2 | 22 | 19 | May 31, 2026 | 153% over the limit |
| BOD, 5-day, 20 deg. C | 9 | 93 | 17 | May 31, 2023 | 202% over the limit |
| BOD, 5-day, percent removal | 2 | 17 | 14 | May 31, 2017 | 345% over the limit |
| pH | 4 | 9 | 4 | July 31, 2021 | |
| Coliform, fecal general | 0 | 1 | 1 | October 31, 1999 | 99,999% over the limit |
| Flow rate | 2 | 138 | 0 | ||
| Nitrite + Nitrate total [as N] | 3 | 11 | 0 | ||
| Chlorine, total residual | 6 | 9 | 0 | ||
| Nitrogen, total [as N] | 5 | 8 | 0 | ||
| Temperature, water deg. centigrade | 3 | 7 | 0 | ||
| Phosphorus, total [as P] | 5 | 6 | 0 | ||
| Oil and grease, hexane extr method | 1 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 3 | 3 | 0 | ||
| Solids, total dissolved [TDS] | 0 | 2 | 0 | ||
| Report due [yrmoda] | 1 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 1 | 0 |
NPDES MT0020249: inspections, violations and enforcement
NPDES MT0020249: 6 informal enforcement actions
| Date | What EPA recorded | Agency |
|---|---|---|
| July 10, 2026 | Letter of Violation/ Warning Letter | State |
| June 10, 2026 | Letter of Violation/ Warning Letter | State |
| May 8, 2026 | Letter of Violation/ Warning Letter | State |
| April 10, 2026 | Letter of Violation/ Warning Letter | State |
| March 12, 2026 | Letter of Violation/ Warning Letter | State |
| February 10, 2026 | Letter of Violation/ Warning Letter | State |
NPDES MT0020249 (JOLIET WWTP): no single-event violation, inspection and formal enforcement action on file.
Watch NPDES MT0020249
NPDES MT0020249: one email when its EPA record changes — $99/month.
Permits near NPDES MT0020249
NPDES MT0020249: 19 pollutant rows, 6 dated events; ICIS-NPDES download, loaded October 14, 2026.