Clean Water Act discharge permit · NPDES TNG110389
MMC MATERIALS, INC.-RIVERPORT PLANT, Memphis, TN: NPDES TNG110389 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
MMC MATERIALS, INC.-RIVERPORT PLANT, held by MMC MATERIALS, INC, holds NPDES permit TNG110389, which discharges to Unnamed Trib Mississippi Ri. EPA’s file records it issued February 13, 2012 and expiring October 31, 2012. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MMC MATERIALS, INC.-RIVERPORT PLANT |
|---|---|
| Permittee as filed | MMC MATERIALS, INC |
| NPDES ID | TNG110389 |
| 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 |
| Issued | February 13, 2012 |
| Expiration date | October 31, 2012 |
| Issuing agency | TDEC-WPC |
| Address | Memphis, TN 38109 |
| Receiving water | UNNAMED TRIB MISSISSIPPI RI |
| Subwatershed | Horn Lake-Horn Lake Pass (HUC 080102110302) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 5Pollutants on file
- 5Under a numeric limit
- 5With 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 | 16 | 0 | ||
| Solids, total suspended | 2 | 8 | 0 | ||
| Iron, total [as Fe] | 1 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 1 | 8 | 0 | ||
| Chemical Oxygen Demand [COD] | 1 | 4 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES TNG110389.
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 TNG110389.
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 TNG110389 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.