Clean Water Act discharge permit · NPDES MT0023078
CITY OF BOULDER WWTF, Boulder, MT: NPDES MT0023078 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 20Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CITY OF BOULDER WWTF, held by CITY OF BOULDER, holds NPDES permit MT0023078, which discharges to Boulder River. EPA’s file records it issued January 12, 2010 and expiring February 28, 2015. 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 | CITY OF BOULDER WWTF |
|---|---|
| Permittee as filed | CITY OF BOULDER |
| NPDES ID | MT0023078 |
| 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 | January 12, 2010 |
| Expiration date | February 28, 2015 |
| Issuing agency | MONTANA DEQ |
| Address | Boulder, MT 59632 |
| Receiving water | BOULDER RIVER |
| Subwatershed | Boulder River-Boulder (HUC 100200060503) |
| 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
- 27Pollutants on file
- 20Under a numeric limit
- 27With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 6 | 132 | 17 | May 31, 2015 | 127% over the limit |
| E. coli, MTEC-MF | 8 | 53 | 14 | May 31, 2025 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 58 | 13 | April 30, 2022 | 151% over the limit |
| Solids, total suspended | 6 | 127 | 12 | May 31, 2015 | 69% over the limit |
| Solids, suspended percent removal | 1 | 26 | 7 | April 30, 2015 | 103% over the limit |
| BOD, 5-day, percent removal | 1 | 23 | 4 | May 31, 2015 | 108% over the limit |
| Oil & Grease | 0 | 17 | 1 | May 31, 2022 | 99,999% over the limit |
| pH | 4 | 49 | 0 | ||
| Flow rate | 0 | 48 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 39 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 39 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 26 | 0 | ||
| Phosphorus, total [as P] | 1 | 22 | 0 | ||
| Nitrogen, total [as N] | 0 | 20 | 0 | ||
| Oil and grease visual | 0 | 16 | 0 | ||
| Iron, total recoverable | 2 | 6 | 0 | ||
| Zinc, total recoverable | 2 | 6 | 0 | ||
| Lead, total recoverable | 2 | 6 | 0 | ||
| Copper, total recoverable | 2 | 6 | 0 | ||
| Chlorine, total residual | 2 | 6 | 0 | ||
| Flow rate | 1 | 6 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 5 | 0 | ||
| Silver total recoverable | 2 | 4 | 0 | ||
| Arsenic, total recoverable | 0 | 3 | 0 | ||
| Cadmium, total recoverable | 0 | 3 | 0 | ||
| Oil and grease, hexane extr method | 1 | 1 | 0 | ||
| Coliform, fecal general | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 5, 2023 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| April 5, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 5, 2023 | Monitoring Violations - Analysis not Conducted | 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
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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 MT0023078 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.