Clean Water Act discharge permit · NPDES MT0020168
LOLO WWTP, Lolo, MT: NPDES MT0020168 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 19Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
LOLO WWTP, held by MISSOULA COUNTY COMMISSIONERS, holds NPDES permit MT0020168, which discharges to Bitterroot River. EPA’s file records it issued July 21, 2014 and expiring August 31, 2019. 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 | LOLO WWTP |
|---|---|
| Permittee as filed | MISSOULA COUNTY COMMISSIONERS |
| NPDES ID | MT0020168 |
| 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 | July 21, 2014 |
| Expiration date | August 31, 2019 |
| Address | Lolo, MT 59847 |
| Receiving water | BITTERROOT RIVER |
| Subwatershed | Bitterroot River-Hayes Creek (HUC 170102051603) |
| 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
- 24Pollutants on file
- 19Under a numeric limit
- 24With 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 |
|---|---|---|---|---|---|
| Nitrogen, total [as N] | 4 | 51 | 17 | September 30, 2013 | 36% over the limit |
| Phosphorus, total [as P] | 4 | 63 | 16 | June 30, 2014 | 155% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 246 | 15 | March 31, 2002 | 340% over the limit |
| E. coli, MTEC-MF | 4 | 48 | 5 | April 30, 2022 | 302% over the limit |
| Solids, total suspended | 6 | 237 | 1 | May 31, 2000 | 4% over the limit |
| pH | 2 | 85 | 1 | February 28, 2014 | |
| Chlorine, total residual | 0 | 80 | 1 | June 30, 2005 | 700% over the limit |
| BOD, 5-day, percent removal | 1 | 44 | 1 | June 30, 2001 | 505% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 92 | 0 | ||
| Coliform, fecal general | 0 | 63 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 52 | 0 | ||
| Temperature, water deg. centigrade | 2 | 43 | 0 | ||
| Solids, suspended percent removal | 1 | 42 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 41 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 34 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 34 | 0 | ||
| Flow rate | 4 | 20 | 0 | ||
| Oil and grease, hexane extr method | 0 | 13 | 0 | ||
| Lead, total recoverable | 1 | 6 | 0 | ||
| Copper, total recoverable | 1 | 5 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 4 | 0 | ||
| Zinc, total recoverable | 1 | 3 | 0 | ||
| Report due [yrmoda] | 1 | 3 | 0 | ||
| Solids, total dissolved [TDS] | 0 | 2 | 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 |
|---|---|---|
| January 24, 2022 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| January 24, 2022 | 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.
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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 MT0020168 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.