Clean Water Act discharge permit · NPDES MT0022641
CITY OF HELENA WWTP, Helena, MT: NPDES MT0022641 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CITY OF HELENA WWTP, held by CITY OF HELENA, holds NPDES permit MT0022641, which discharges to Prickly Pear Creek. EPA’s file records it issued December 11, 1996 and expiring October 31, 2001. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CITY OF HELENA WWTP |
|---|---|
| Permittee as filed | CITY OF HELENA |
| NPDES ID | MT0022641 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 11, 1996 |
| Expiration date | October 31, 2001 |
| Issuing agency | MONTANA DEQ |
| Address | Helena, MT 59602 |
| Receiving water | PRICKLY PEAR CREEK |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 15Under a numeric limit
- 12With 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 |
|---|---|---|---|---|---|
| Copper, total recoverable | 0 | 32 | 32 | August 31, 2025 | 3,722% over the limit |
| Zinc, total recoverable | 0 | 28 | 28 | February 28, 2026 | 600% over the limit |
| Nitrogen, ammonia total [as N] | 72 | 2 | 2 | October 31, 2008 | 99,999% over the limit |
| BOD, 5-day, percent removal | 1 | 2 | 2 | October 31, 2006 | 99,999% over the limit |
| Phosphorus, total [as P] | 3 | 3 | 1 | June 30, 2022 | 9% over the limit |
| pH | 2 | 1 | 1 | August 31, 2023 | |
| E. coli, MTEC-MF | 0 | 1 | 1 | January 31, 2022 | 99,999% over the limit |
| Coliform, fecal general | 21 | 9 | 0 | ||
| Oil and grease, hexane extr method | 0 | 8 | 0 | ||
| Solids, total suspended | 6 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 1 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 1 | 0 | ||
| BOD, 5-day, 20 deg. C | 6 | 0 | 0 | ||
| Nitrogen, total [as N] | 3 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Solids, suspended percent removal | 1 | 0 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 1 | 0 | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 21, 2026 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| January 21, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 10, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 10, 2024 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| September 13, 2017 | Pretreatment - Failure to Develop/Enforce Standards | EP6 |
| September 13, 2017 | Pretreatment - Failure to Establish Local Limits | EP6 |
| September 13, 2017 | Pretreatment - Failure to Meet Inspection and Sampling Plan for SIUs | EP6 |
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MT0022641.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MT0022641 there.
Nearby on the register
- Discharge permits in Helena
- Every permit record in Helena, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.