Clean Water Act discharge permit · NPDES MT0022080
HIGHWOOD WWTP, Highwood, MT: NPDES MT0022080 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
HIGHWOOD WWTP, held by HIGHWOOD COUNTY WATER AND SEWER DISTRICT, holds NPDES permit MT0022080, which discharges to Highwood Creek. EPA’s file records it issued September 14, 2010 and expiring October 31, 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 | HIGHWOOD WWTP |
|---|---|
| Permittee as filed | HIGHWOOD COUNTY WATER AND SEWER DISTRICT |
| NPDES ID | MT0022080 |
| 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 | September 14, 2010 |
| Expiration date | October 31, 2015 |
| Issuing agency | MONTANA DEQ |
| Address | Highwood, MT 59450 |
| Receiving water | HIGHWOOD CREEK |
| Subwatershed | Lower Highwood Creek (HUC 100301021304) |
| 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
- 14Under a numeric limit
- 19With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 441 | 41 | June 30, 2023 | 979% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 509 | 28 | May 31, 2025 | 233% over the limit |
| BOD, 5-day, percent removal | 1 | 76 | 15 | May 31, 2025 | 325% over the limit |
| pH | 2 | 305 | 9 | April 30, 2025 | |
| Solids, suspended percent removal | 0 | 50 | 6 | June 30, 2026 | 567% over the limit |
| Phosphorus, total [as P] | 3 | 232 | 2 | July 31, 2021 | 48% over the limit |
| Flow rate | 2 | 258 | 0 | ||
| Nitrogen, total [as N] | 3 | 239 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 223 | 0 | ||
| E. coli, MTEC-MF | 4 | 188 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 158 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 158 | 0 | ||
| Temperature, water deg. centigrade | 2 | 120 | 0 | ||
| Duration | 1 | 93 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 65 | 0 | ||
| Oil and grease visual | 0 | 46 | 0 | ||
| Coliform, fecal general | 0 | 39 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 30 | 0 | ||
| Oil and grease, hexane extr method | 1 | 9 | 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
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 16, 2023 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| March 16, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| March 16, 2023 | Monitoring Violations - Analysis not Conducted | ST6 |
| March 16, 2023 | Reporting Violations - Late Submittal of DMRs | ST6 |
| March 16, 2023 | Reporting Violations - Failure to Submit DMRs | ST6 |
| March 16, 2023 | Management Practice Violations - Failure to Maintain Records | ST6 |
| January 11, 2018 | Monitoring Violations - Analysis not Conducted | ST6 |
| January 11, 2018 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| January 11, 2018 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| January 11, 2018 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 11, 2018 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 11, 2018 | Management Practice Violations - Failure to Maintain Records | 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 MT0022080 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.