Clean Water Act discharge permit · NPDES TX0111937
WEST HARRIS COUNTY MUD NO 11 WWTF, Houston, TX: NPDES TX0111937 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
- 0Inspections on file
- 1Formal enforcement actions
WEST HARRIS COUNTY MUD NO 11 WWTF, held by WEST HARRIS COUNTY MUD 11, holds NPDES permit TX0111937, which discharges to Whiteoak Bayou Above Tidal. EPA’s file records it issued September 30, 2021 and expiring September 30, 2024. 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 | WEST HARRIS COUNTY MUD NO 11 WWTF |
|---|---|
| Permittee as filed | WEST HARRIS COUNTY MUD 11 |
| NPDES ID | TX0111937 |
| 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 30, 2021 |
| Expiration date | September 30, 2024 |
| Address | Houston, TX 77040 |
| Receiving water | Whiteoak Bayou Above Tidal |
| Subwatershed | Jersey Lake-Whiteoak Bayou (HUC 120401040301) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 55Pollutants on file
- 26Under a numeric limit
- 55With a violation of any kind
- 7With 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] | 3 | 41 | 16 | July 31, 2015 | 125% over the limit |
| Copper, total [as Cu] | 3 | 22 | 16 | February 28, 2026 | 33,233% over the limit |
| E. coli | 2 | 18 | 11 | February 28, 2025 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 59 | 2 | August 31, 2017 | 21% over the limit |
| Chlorine, total residual | 2 | 35 | 2 | July 31, 2016 | 99% over the limit |
| Solids, total suspended | 3 | 29 | 1 | March 31, 2005 | 12% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 29 | 1 | March 31, 2025 | 8% over the limit |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 22 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 22 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 22 | 0 | ||
| pH | 2 | 21 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 20 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 20 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 20 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 10 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 10 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 10 | 0 | ||
| Arsenic, dry weight | 0 | 5 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 0 | 5 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 4 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 4 | 0 | ||
| Solids, total dissolved | 3 | 3 | 0 | ||
| Selenium, dry weight | 0 | 3 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 0 | 3 | 0 | ||
| Copper, dry weight | 0 | 3 | 0 | ||
| Cadmium, dry weight | 0 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 0 | 3 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 0 | 3 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 0 | 3 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 0 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 0 | 3 | 0 | ||
| Nickel, total [as Ni] | 0 | 2 | 0 | ||
| Toxicity characteristic leaching procedure | 0 | 2 | 0 | ||
| Ann. amt sludge disposed by other method | 0 | 2 | 0 | ||
| Annual amt of sludge incinerated | 0 | 2 | 0 | ||
| Annual sludge production, total | 0 | 2 | 0 | ||
| Annual amount of sludge land applied | 0 | 2 | 0 | ||
| Annual amt. sludge disposed surface unit | 0 | 2 | 0 | ||
| Annual amt sludge disposed in landfill | 0 | 2 | 0 | ||
| Annual amt sludge transported interstate | 0 | 2 | 0 | ||
| Level of pathogen requirements achieved | 0 | 2 | 0 | ||
| Description of pathogen option used | 0 | 2 | 0 | ||
| Vector attraction reduction alternative used | 0 | 2 | 0 | ||
| Fecal coliform | 0 | 1 | 0 | ||
| Unit w/liner/leachate collection system | 0 | 1 | 0 | ||
| Compliance w/part 258 sludge requirement | 0 | 1 | 0 | ||
| Boundary areas | 0 | 1 | 0 | ||
| Salmonella | 0 | 1 | 0 | ||
| Pollutant table from 503.13 | 0 | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 26, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES TX0111937.
Formal enforcement and penalties
1 formal actions, 1 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
| Date | What EPA recorded | Agency | Federal penalty | State or local penalty |
|---|---|---|---|---|
| October 14, 2026 | State CWA Penalty AO | State | $26,725 |
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES TX0111937.
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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How we handle your data → Privacy
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 TX0111937 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.