Clean Water Act discharge permit · NPDES MT0029980
WATER TREATMENT PLANT - MACRO, Saint Marie, MT: NPDES MT0029980 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
WATER TREATMENT PLANT - MACRO, held by MONTANA AVIATION RESEARCH CO, holds NPDES permit MT0029980, which discharges to E. Fork Cherry Ck Via Spring Coulee. EPA’s file records it issued October 24, 2014 and expiring November 30, 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 | WATER TREATMENT PLANT - MACRO |
|---|---|
| Permittee as filed | MONTANA AVIATION RESEARCH CO |
| NPDES ID | MT0029980 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | October 24, 2014 |
| Expiration date | November 30, 2019 |
| Address | Saint Marie, MT 59231 |
| Receiving water | E. FORK CHERRY CK VIA SPRING COULEE |
| Subwatershed | Lower East Fork Cherry Creek (HUC 100500120603) |
| SIC | 3721 – Aircraft |
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
- 8Pollutants on file
- 6Under a numeric limit
- 8With 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 | 2 | 42 | 0 | ||
| Solids, total suspended | 2 | 42 | 0 | ||
| Aluminum, dissolved [as Al] | 2 | 42 | 0 | ||
| Chlorine, total residual | 2 | 42 | 0 | ||
| Flow rate | 0 | 18 | 0 | ||
| Oil and grease visual | 0 | 18 | 0 | ||
| Flow rate | 2 | 6 | 0 | ||
| Duration of discharge | 1 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0029980.
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 MT0029980.
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 MT0029980 there.
Nearby on the register
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- Every permit record in Saint Marie, A to Z
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.