Clean Water Act discharge permit · NPDES MT0020249
JOLIET WWTP, Joliet, MT: NPDES MT0020249 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
JOLIET WWTP, held by TOWN OF JOLIET, holds NPDES permit MT0020249, which discharges to Rock Creek. EPA’s file records it issued May 18, 2015 and expiring June 30, 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 | JOLIET WWTP |
|---|---|
| Permittee as filed | TOWN OF JOLIET |
| NPDES ID | MT0020249 |
| 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 | May 18, 2015 |
| Expiration date | June 30, 2020 |
| Address | Joliet, MT 59041 |
| Receiving water | ROCK CREEK |
| Subwatershed | Rock Creek-Cow Creek (HUC 100700060908) |
| 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
- 19Pollutants on file
- 16Under a numeric limit
- 19With a violation of any kind
- 8With 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 | 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 |
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0020249.
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 MT0020249 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.