Clean Water Act discharge permit · NPDES MOG670441
ML 1 MERAMEC RIVER RELAY HDD, Arnold, MO: NPDES MOG670441 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
ML 1 MERAMEC RIVER RELAY HDD, held by Enable Mississippi River Transmission, holds NPDES permit MOG670441, which discharges to Tributary To Meramec R.. EPA’s file records it issued October 1, 2025 and expiring October 4, 2027. 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 | ML 1 MERAMEC RIVER RELAY HDD |
|---|---|
| Permittee as filed | Enable Mississippi River Transmission |
| NPDES ID | MOG670441 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | October 1, 2025 |
| Expiration date | October 4, 2027 |
| Address | Arnold, MO 63010 |
| Receiving water | Tributary to Meramec R. |
| Subwatershed | Meramec River (HUC 071401021004) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 6Under a numeric limit
- 2With a violation of any kind
- 2With 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 | 1 | 1 | November 30, 2025 | |
| Report due [yrmoda] | 1 | 1 | 1 | November 30, 2025 | |
| Solids, total suspended | 2 | 0 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MOG670441.
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, MOG670441.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
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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 MOG670441 there.
Nearby on the register
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- Every permit record in Arnold, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.