Clean Water Act discharge permit · NPDES TX0062995
SOUTHWEST WWTP, Houston, TX: NPDES TX0062995 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 51Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
SOUTHWEST WWTP, held by CITY OF HOUSTON, holds NPDES permit TX0062995, which discharges to Brays Bayou, Houston Ship Channel. EPA’s file records it issued January 24, 2018 and expiring September 1, 2022. 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 | SOUTHWEST WWTP |
|---|---|
| Permittee as filed | CITY OF HOUSTON |
| NPDES ID | TX0062995 |
| 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 | January 24, 2018 |
| Expiration date | September 1, 2022 |
| Address | Houston, TX 77096 |
| Receiving water | BRAYS BAYOU, HOUSTON SHIP CHANNEL |
| Subwatershed | Country Club Bayou-Brays Bayou (HUC 120401040403) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 52Pollutants on file
- 51Under a numeric limit
- 15With a violation of any kind
- 6With 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 | 122 | 122 | July 31, 2026 | 233% over the limit |
| E. coli | 2 | 90 | 90 | June 30, 2026 | 99,999% over the limit |
| Solids, total suspended | 3 | 66 | 66 | June 30, 2026 | 1,950% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 21 | 20 | January 31, 2025 | 99,999% over the limit |
| Whole effluent toxicity | 0 | 4 | 4 | March 31, 2017 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 1 | 1 | November 30, 2004 | 17% over the limit |
| Whole Effluent Toxicity [WET] - C. dubia | 2 | 22 | 0 | ||
| IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| Whole effluent toxicity - retest #1 | 5 | 2 | 0 | ||
| Whole effluent toxicity - retest #2 | 5 | 2 | 0 | ||
| Chlorine, total residual | 2 | 1 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 1 | 0 | ||
| Arsenic, dry weight | 5 | 0 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 0 | 0 | ||
| pH | 3 | 0 | 0 | ||
| Selenium, dry weight | 3 | 0 | 0 | ||
| Copper, dry weight | 3 | 0 | 0 | ||
| Cadmium, dry weight | 3 | 0 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Level of pathogen requirements achieved | 2 | 0 | 0 | ||
| Description of pathogen option used | 2 | 0 | 0 | ||
| Vector attraction reduction alternative used | 2 | 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 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| Fecal coliform | 1 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 0 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 0 | 0 | ||
| Annual whole sludge application rate | 1 | 0 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 0 | 0 | ||
| Annual amt of sludge incinerated | 1 | 0 | 0 | ||
| Annual sludge production, total | 1 | 0 | 0 | ||
| Annual amount of sludge land applied | 1 | 0 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 0 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 0 | 0 | ||
| Annual amt sludge transported interstate | 1 | 0 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 0 | 0 | ||
| Boundary areas | 1 | 0 | 0 | ||
| Salmonella | 1 | 0 | 0 | ||
| Pollutant table from 503.13 | 1 | 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
- 29Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 26, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| July 9, 2024 | Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| January 24, 2024 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| November 28, 2023 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | EP6 |
| October 30, 2023 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | EP6 |
| October 20, 2023 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 6, 2023 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| May 14, 2023 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 5, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 5, 2022 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 13, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 1, 2022 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| January 14, 2022 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| January 1, 2022 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 5, 2021 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 5, 2021 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| April 29, 2021 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| April 7, 2021 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| April 5, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| April 3, 2021 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 8, 2020 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 1, 2020 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 23, 2020 | WW SSO - Discharge to Waters | EP6 |
| January 23, 2020 | WW SSO - Discharge to Waters | EP6 |
| January 10, 2020 | Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| October 2, 2019 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | EP6 |
| September 30, 2019 | WW SSO - Overflow to Dry Land or Building Backup | EP6 |
| August 2, 2018 | WW SSO - Discharge to Waters | EP6 |
| June 26, 2018 | 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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.