Clean Water Act discharge permit · NPDES TX0020788
WILLOWOOD WWTP, Houston, TX: NPDES TX0020788 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 56Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
WILLOWOOD WWTP, held by HARRIS COUNTY WCID 133, holds NPDES permit TX0020788, which discharges to Vogel Creek; White Oak Bayou. EPA’s file records it issued December 20, 2017 and expiring March 1, 2022.
WILLOWOOD WWTP, Houston, Texas: Individual permit TX0020788, held by HARRIS COUNTY WCID 133; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued December 20, 2017, term to March 1, 2022; discharges to VOGEL CREEK; WHITE OAK BAYOU.
- Nitrogen, ammonia total [as N]: 6 limits, 19 violations of any kind, 7 effluent exceedances, latest June 30, 2016, largest 70% over the limit.
- E. coli: 2 limits, 11 violations of any kind, 7 effluent exceedances, latest August 31, 2024, largest 99,999% over the limit.
- Chlorine, total residual: 2 limits, 12 violations of any kind, 6 effluent exceedances, latest August 31, 2014, largest 60% over the limit.
- Flow, in conduit or thru treatment plant: 4 limits, 19 violations of any kind, 3 effluent exceedances, latest July 31, 2024, largest 11% over the limit.
- Solids, total suspended: 3 limits, 13 violations of any kind, 1 effluent exceedance, latest February 28, 2006, largest 13% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 10 violations of any kind, 1 effluent exceedance, latest July 31, 2022, largest 39% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 5 violations of any kind, 1 effluent exceedance, latest May 31, 2024, largest 75% over the limit.
- pH: 3 limits, 8 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 8 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 8 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 8 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 7 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Whole Effluent Toxicity [WET] - C. dubia: 8 limits, 4 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 3 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 3 limits, 2 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 5 limits, 1 violation of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 1 violation of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 1 violation of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Ann. amt sludge disposed by other method: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual sludge production, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Compliance w/part 258 sludge requirement: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Chloride: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Nickel, total [as Ni]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Fecal coliform: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual whole sludge application rate: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Unit w/liner/leachate collection system: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Boundary areas: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Salmonella: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Pollutant table from 503.13: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- December 12, 2024: Permit Violations - Violation Specified in Comment (ST6).
- June 12, 2018: Permit Violations - Violation Specified in Comment (ST6).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 627 were issued before TX0020788.
Coverages issued nearest TX0020788
- December 13, 2017: CITY OF WOODBRANCH VILLAGE WWTP, New Caney, TX0077241, held by CITY OF WOODBRANCH VILLAGE
- December 13, 2017: NORTH GREEN MUD WWTP, Houston, TX0083381, held by NORTH GREEN MUD
- December 13, 2017: HARRIS COUNTY MUD 202 WWTP, Houston, TX0091901, held by HARRIS COUNTY MUD 202
- December 13, 2017: CEDAR BAYOU WWTP, Houston, TX0103667, held by HOUSTON, CITY OF
- December 13, 2017: HARRIS CO MUD NO 148 WWTP 2, Houston, TX0131482, held by HARRIS COUNTY MUD 148
- December 20, 2017: EL DORADO UTILITY DISTRICT WWTF, Houston, TX0025623, held by EL DORADO UTILITY DISTRICT
- December 20, 2017: CLINTON PARK WWTP, Houston, TX0035106, held by HOUSTON, CITY OF
- December 20, 2017: MILLS ROAD MUD WWTF, Houston, TX0075132, held by MILLS ROAD MUD
- December 20, 2017: HARRIS COUNTY MUD 86 WWTP, Houston, TX0078824, held by HARRIS COUNTY MUD 86
- December 20, 2017: SAN JACINTO ELEMENTARY WWTP, Conroe, TX0083208, held by CONROE ISD
WILLOWOOD WWTP among its neighbors
EPA’s permit file holds 309 discharge permits in the Cole Creek-Whiteoak Bayou subwatershed (HUC 120401040302), TX0020788 among them. Its county holds 4,455, 195 of them major permits; TX0020788 is a major permit.
Other permits in the Cole Creek-Whiteoak Bayou subwatershed (HUC 120401040302)
- 249 AUTO PARTS, Houston: TXR05FV48, minor permit, permit term to August 13, 2026
- 3 MEN MOVERS HOUSTON, Houston: TXR1502XH, minor permit, discharging to COLE CREEK, permit term to March 4, 2028
- 7101 BREEN DRIVE FACILITY, Houston: TXRNEBR66, minor permit, permit term to August 13, 2026
- 7101 HOLLISTER, Houston: TXR1573YB, minor permit, discharging to COLE CREEK, permit term to March 4, 2028
- AAAR TELL HOUSTON, Houston: TXRNECD51, minor permit, permit term to August 13, 2026
- ACC HOU - CRAWFORD, Houston: TXR05GR40, minor permit, permit term to August 13, 2026
- ACRES HOMES LAND HOLDINGS, Houston: TXR1572WL, minor permit, discharging to WHITE OAK ABOVE TIDAL, permit term to March 4, 2028
- ADMIRAL TRANSFER AND RIGGING, Houston: TXR05W493, minor permit, permit term to August 13, 2026
- ADVANCED AUTO PARTS DISTRIBUTION CENTER 49, Houston: TXR05GT69, minor permit, permit term to August 13, 2026
- ADVANCED MILLING CONCEPTS, Houston: TXRNEBY41, minor permit, permit term to August 13, 2026
Identity
| Facility as filed | WILLOWOOD WWTP |
|---|---|
| Permittee as filed | HARRIS COUNTY WCID 133 |
| NPDES ID | TX0020788 |
| 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 | December 20, 2017 |
| Expiration date | March 1, 2022 |
| Address | Houston, TX 77086 |
| Receiving water | VOGEL CREEK; WHITE OAK BAYOU |
| Subwatershed | Cole Creek-Whiteoak Bayou (HUC 120401040302) |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 56Pollutants on file
- 56Under a numeric limit
- 42With 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] | 6 | 19 | 7 | June 30, 2016 | 70% over the limit |
| E. coli | 2 | 11 | 7 | August 31, 2024 | 99,999% over the limit |
| Chlorine, total residual | 2 | 12 | 6 | August 31, 2014 | 60% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 19 | 3 | July 31, 2024 | 11% over the limit |
| Solids, total suspended | 3 | 13 | 1 | February 28, 2006 | 13% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 10 | 1 | July 31, 2022 | 39% over the limit |
| Oxygen, dissolved [DO] | 1 | 5 | 1 | May 31, 2024 | 75% over the limit |
| pH | 3 | 8 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 8 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 8 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 8 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 7 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 6 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 6 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 6 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 6 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 6 | 0 | ||
| Whole Effluent Toxicity [WET] - C. dubia | 8 | 4 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 3 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 2 | 0 | ||
| Arsenic, dry weight | 5 | 1 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 1 | 0 | ||
| Selenium, dry weight | 3 | 1 | 0 | ||
| Copper, dry weight | 3 | 1 | 0 | ||
| Cadmium, dry weight | 3 | 1 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 1 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 1 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 1 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 1 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 1 | 0 | ||
| Annual amt of sludge incinerated | 1 | 1 | 0 | ||
| Annual sludge production, total | 1 | 1 | 0 | ||
| Annual amount of sludge land applied | 1 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 1 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 1 | 0 | ||
| Annual amt sludge transported interstate | 1 | 1 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 1 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 0 | 0 | ||
| Chloride | 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 | ||
| Fecal coliform | 1 | 0 | 0 | ||
| Annual whole sludge application rate | 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 |
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 12, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| June 12, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES TX0020788.
Formal enforcement and penalties
0 formal actions, 0 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.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES TX0020788.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.