Clean Water Act discharge permit · NPDES TX0026433
GREEN RIDGE WWTP, Houston, TX: NPDES TX0026433 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 20Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
GREEN RIDGE WWTP, held by HOUSTON, CITY OF, holds NPDES permit TX0026433, which discharges to Houston Ship Channel (Buffalo Bayou Tidal). EPA’s file records it issued September 8, 2022 and expiring September 8, 2025. 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 | GREEN RIDGE WWTP |
|---|---|
| Permittee as filed | HOUSTON, CITY OF |
| NPDES ID | TX0026433 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 8, 2022 |
| Expiration date | September 8, 2025 |
| Address | Houston, TX 77489 |
| Receiving water | Houston Ship Channel (Buffalo Bayou Tidal) |
| Subwatershed | Upper Sims Bayou (HUC 120401040501) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 20Under a numeric limit
- 16With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 6 | 35 | 32 | September 30, 2025 | 150% over the limit |
| E. coli | 2 | 31 | 31 | June 30, 2025 | 99,999% over the limit |
| Solids, total suspended | 3 | 27 | 24 | March 31, 2025 | 515% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 8 | 5 | June 30, 2020 | 20% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 12 | 3 | August 31, 2017 | 20% over the limit |
| pH | 2 | 14 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 3 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| Annual amt of sludge incinerated | 0 | 1 | 0 | ||
| Annual amt sludge transported interstate | 0 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 5 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 5 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 0 | 0 | ||
| IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 0 | 0 | ||
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 0 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 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
- 25Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 6, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
| July 15, 2024 | Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| December 8, 2023 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 7, 2023 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| May 17, 2023 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| May 15, 2023 | Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| November 9, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 27, 2022 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 10, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| March 25, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| February 8, 2022 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| November 2, 2021 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 21, 2021 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| June 5, 2021 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| May 18, 2021 | Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| April 12, 2021 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| December 17, 2020 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 5, 2020 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 24, 2020 | WW SSO - Discharge to Waters | EP6 |
| January 12, 2020 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| December 5, 2019 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | EP6 |
| September 21, 2019 | WW SSO - Overflow to Dry Land or Building Backup | EP6 |
| May 11, 2019 | WW SSO - Discharge to Waters | EP6 |
| December 12, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| June 4, 2018 | WW SSO - Discharge to Waters | EP6 |
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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.