Clean Water Act discharge permit · NPDES TX0074438
GIBBONS CREEK STEAM ELECTRIC STATION, Grimes County, TX: NPDES TX0074438 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 31Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
GIBBONS CREEK STEAM ELECTRIC STATION, held by TEXAS MUNICIPAL POWER AGENCY, holds NPDES permit TX0074438, which discharges to Unnamed Ditch; Gibbons Creek. EPA’s file records it issued December 1, 2015 and expiring May 1, 2020. 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 | GIBBONS CREEK STEAM ELECTRIC STATION |
|---|---|
| Permittee as filed | TEXAS MUNICIPAL POWER AGENCY |
| NPDES ID | TX0074438 |
| 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 | December 1, 2015 |
| Expiration date | May 1, 2020 |
| Address | Grimes County, TX 77830 |
| Receiving water | UNNAMED DITCH; GIBBONS CREEK |
| Subwatershed | Panther Creek (HUC 120701030703) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler TXD000751073; ICIS-AIR source TX0000004818500002 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 32Pollutants on file
- 31Under a numeric limit
- 31With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 4 | 43 | 27 | May 31, 2024 | 1,597% over the limit |
| Oil & Grease | 6 | 19 | 15 | March 31, 2025 | 945% over the limit |
| Solids, total suspended | 8 | 37 | 14 | June 30, 2023 | 532% over the limit |
| Chlorine, total residual | 4 | 32 | 11 | October 31, 2018 | 81% over the limit |
| Sulfate, total [as SO4] | 6 | 6 | 4 | February 29, 2016 | 21% over the limit |
| Oxygen demand, chem. [high level] [COD] | 2 | 4 | 4 | December 31, 2024 | 27% over the limit |
| pH | 10 | 25 | 2 | May 31, 2019 | |
| Selenium, total [as Se] | 8 | 5 | 2 | March 31, 2021 | 139% over the limit |
| Aluminum, total [as Al] | 0 | 2 | 2 | December 31, 2008 | 74% over the limit |
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 4 | 28 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 4 | 26 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 24 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 24 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 20 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 19 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 4 | 19 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 19 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 19 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 19 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 18 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 4 | 18 | 0 | ||
| Flow, in conduit or thru treatment plant | 10 | 11 | 0 | ||
| Whole effluent toxicity - retest #1 | 6 | 4 | 0 | ||
| E. coli | 4 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 2 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 2 | 4 | 0 | ||
| Whole effluent toxicity - retest #2 | 6 | 2 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 2 | 0 | ||
| Copper, total [as Cu] | 2 | 2 | 0 | ||
| Iron, total [as Fe] | 2 | 2 | 0 | ||
| Solids, total dissolved | 6 | 1 | 0 | ||
| Chloride [as Cl] | 4 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 22, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| December 7, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
| January 16, 2019 | Permit Violations - Violation Specified in Comment | ST6 |
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.
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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 TX0074438 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.