Clean Water Act discharge permit · NPDES TX0006386
GREENS BAYOU ELECTRIC GENERATING STATION, Houston, TX: NPDES TX0006386 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
GREENS BAYOU ELECTRIC GENERATING STATION, held by NRG TEXAS POWER LLC, holds NPDES permit TX0006386, which discharges to Spring Gully, Greens Bayou Portion Of Houston Ship. EPA’s file records it issued February 5, 2018 and expiring February 5, 2021. 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 | GREENS BAYOU ELECTRIC GENERATING STATION |
|---|---|
| Permittee as filed | NRG TEXAS POWER LLC |
| NPDES ID | TX0006386 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | February 5, 2018 |
| Expiration date | February 5, 2021 |
| Address | Houston, TX 77049 |
| Receiving water | SPRING GULLY, GREENS BAYOU PORTION OF HOUSTON SHIP |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower Greens Bayou (HUC 120401040606) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 28Under a numeric limit
- 15With a violation of any kind
- 4With 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 [as Cu] | 4 | 9 | 3 | June 30, 2012 | 39% over the limit |
| Chlorine, total residual | 2 | 2 | 2 | April 30, 2012 | 3,150% over the limit |
| Oil & Grease | 8 | 12 | 1 | January 31, 2026 | 8% over the limit |
| E. coli | 4 | 1 | 1 | September 30, 2025 | 646% over the limit |
| Solids, total suspended | 11 | 15 | 0 | ||
| pH | 10 | 8 | 0 | ||
| Iron, total [as Fe] | 2 | 7 | 0 | ||
| Flow, in conduit or thru treatment plant | 12 | 4 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 3 | 0 | ||
| Chlorine, free available | 4 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia | 4 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 4 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia | 4 | 2 | 0 | ||
| Solids, total dissolved | 1 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 7 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 7 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 4 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 4 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 0 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 0 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 4 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Menidia menidia | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0006386.
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 TX0006386 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.