Clean Water Act discharge permit · NPDES MTR000490
THE BOEING COMPANY - BOEING HELENA AERONAUTICS MANUFACTURING FACILITY, Helena, MT: NPDES MTR000490 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
THE BOEING COMPANY - BOEING HELENA AERONAUTICS MANUFACTURING FACILITY, held by THE BOEING COMPANY, holds NPDES permit MTR000490, which discharges to Prickly Pear Creek. EPA’s file records it issued July 26, 2018 and expiring January 31, 2023. 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 | THE BOEING COMPANY - BOEING HELENA AERONAUTICS MANUFACTURING FACILITY |
|---|---|
| Permittee as filed | THE BOEING COMPANY |
| NPDES ID | MTR000490 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | July 26, 2018 |
| Expiration date | January 31, 2023 |
| Address | Helena, MT 59602 |
| Receiving water | PRICKLY PEAR CREEK |
| Subwatershed | Lower Prickley Pear Gulch (HUC 100301011310) |
| Other EPA IDs (FRS) | RCRA handler MTR000201707 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 3Pollutants on file
- 0Under a numeric limit
- 3With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 0 | 2 | 0 | ||
| Solids, total suspended | 0 | 2 | 0 | ||
| Chemical Oxygen Demand [COD] | 0 | 2 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000490.
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 MTR000490.
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 MTR000490 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.