Clean Water Act discharge permit · NPDES TX0076856
HARRIS COUNTY MUD 24 WWTP, Houston, TX: NPDES TX0076856 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 54Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
HARRIS COUNTY MUD 24 WWTP, held by HARRIS COUNTY MUD NO 24, holds NPDES permit TX0076856, which discharges to Theiss Gully, Spring Gully, Cypress Creek. EPA’s file records it issued May 16, 2018 and expiring May 16, 2023.
HARRIS COUNTY MUD 24 WWTP, Houston, Texas: Individual permit TX0076856, held by HARRIS COUNTY MUD NO 24; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued May 16, 2018, term to May 16, 2023; discharges to THEISS GULLY, SPRING GULLY, CYPRESS CREEK.
- E. coli: 2 limits, 17 violations of any kind, 17 effluent exceedances, latest March 31, 2026, largest 99,999% over the limit.
- Solids, total suspended: 3 limits, 60 violations of any kind, 9 effluent exceedances, latest September 30, 2007, largest 125% over the limit.
- Nitrogen, ammonia total [as N]: 6 limits, 68 violations of any kind, 8 effluent exceedances, latest April 30, 2008, largest 107% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 6 limits, 64 violations of any kind, 4 effluent exceedances, latest August 31, 2025, largest 99,999% over the limit.
- Whole effluent toxicity: 0 limits, 10 violations of any kind, 2 effluent exceedances, latest March 31, 2018, largest 48% over the limit.
- Flow, in conduit or thru treatment plant: 4 limits, 85 violations of any kind, 1 effluent exceedance, latest May 31, 2015, largest 10% over the limit.
- pH: 3 limits, 45 violations of any kind, 1 effluent exceedance, latest May 31, 2012.
- Oxygen, dissolved [DO]: 1 limit, 23 violations of any kind, 1 effluent exceedance, latest August 31, 2011, largest 3% over the limit.
- Chlorine, total residual: 2 limits, 43 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 28 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 28 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 26 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas: 2 limits, 24 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #1: 3 limits, 13 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 3 limits, 13 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit, 5 violations of any kind, 0 effluent exceedances.
- LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit, 5 violations of any kind, 0 effluent exceedances.
- Chloride [as Cl]: 0 limits, 3 violations of any kind, 0 effluent exceedances.
- Solids, total dissolved: 0 limits, 3 violations 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.
- Arsenic, dry weight: 5 limits, 0 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 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.
- Ann. amt sludge disposed by other method: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual sludge production, total: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 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.
- Compliance w/part 258 sludge requirement: 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.
- September 16, 2025: Permit Violations - Violation Specified in Comment (ST6).
- July 9, 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; 780 were issued before TX0076856.
Coverages issued nearest TX0076856
- May 9, 2018: HARRIS COUNTY MUD 495 WWTP 2, Katy, TX0138002, held by HARRIS COUNTY MUD 495
- May 14, 2018: KLEINWOOD JOINT POWERS BOARD WWTP, Harris County, TX0046817, held by KLEINWOOD JOINT POWERS BOARD
- May 14, 2018: HARRIS COUNTY MUD 82 WWTP, Houston, TX0071528, held by HARRIS COUNTY MUD 82
- May 14, 2018: NORTHWEST HARRIS COUNTY MUD 19 WWTP, Houston, TX0081264, held by NORTHWEST HARRIS COUNTY MUD 19
- May 14, 2018: ANNE LOUISE EDUCATIONAL COMPLEX, Houston, TX0115797, held by ALDINE ISD
- May 16, 2018: NORTHWEST HARRIS COUNTY MUD 32 WWTP, Harris County, TX0098647, held by NORTHWEST HARRIS COUNTY MUD NO 32
- May 17, 2018: ENCANTO REAL UD WWTP, Klein, TX0042099, held by ENCANTO REAL UTILITY DISTRICT
- May 18, 2018: BAMMEL UTILITY DISTRICT WWTP, Houston, TX0046639, held by BAMMEL UTILITY DISTRICT
- May 18, 2018: TIMBER LANE UTILITY DISTRICT WWTP, Houston, TX0046680, held by TIMBER LANE UTILITY DISTRICT
- May 21, 2018: SAVOY WWTP, Savoy, TX0023299, held by CITY OF SOVOY
HARRIS COUNTY MUD 24 WWTP among its neighbors
EPA’s permit file holds 121 discharge permits in the Marshall Lake-Cypress Creek subwatershed (HUC 120401020106), TX0076856 among them. Its county holds 4,455, 195 of them major permits; TX0076856 is a major permit.
Other permits in the Marshall Lake-Cypress Creek subwatershed (HUC 120401020106)
- ALTA LACEY ROAD, Tomball: TXR1599XG, minor permit, discharging to DRY GULLY, permit term to March 4, 2028
- AMPLIFY TOMBALL, Tomball: TXR1556TH, minor permit, discharging to DRY GULLY, permit term to March 4, 2028
- APEX OIL & GAS, INC., Houston: GMG290176, minor permit, permit term to September 30, 2012
- ASHER SPRING CYPRESS, Houston: TXR1539WZ, minor permit, discharging to DRY GULLY, permit term to March 4, 2028
- BAMMEL UTILITY DISTRICT WWTP, Houston: TX0046639, major permit, discharging to CYPRESS CREEK, permit term to May 18, 2023
- BEARDED FOX BREWING, Tomball: TXRNECD24, minor permit, permit term to August 13, 2026
- BECK AND MASTEN KIA PHASE 2, Tomball: TXR1513YF, minor permit, discharging to DRY GULLY, permit term to March 4, 2028
- BILMA PUD - WWTP, Houston: TX0077941, minor permit, discharging to HCFCD K131-03-00;SPRING GULLY;CYPRESS CK, permit term to February 1, 2023
- BRICCO METAL FINISHING, Cypress: TXR05GL91, minor permit, permit term to August 13, 2026
- BRICCO METAL FINISHING, Cypress: TXRNEBU18, minor permit, permit term to August 13, 2026
Identity
| Facility as filed | HARRIS COUNTY MUD 24 WWTP |
|---|---|
| Permittee as filed | HARRIS COUNTY MUD NO 24 |
| NPDES ID | TX0076856 |
| 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 | May 16, 2018 |
| Expiration date | May 16, 2023 |
| Address | Houston, TX 77379 |
| Receiving water | THEISS GULLY, SPRING GULLY, CYPRESS CREEK |
| Subwatershed | Marshall Lake-Cypress Creek (HUC 120401020106) |
Effluent limits and exceedances
- 57Pollutants on file
- 54Under a numeric limit
- 29With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| E. coli | 2 | 17 | 17 | March 31, 2026 | 99,999% over the limit |
| Solids, total suspended | 3 | 60 | 9 | September 30, 2007 | 125% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 68 | 8 | April 30, 2008 | 107% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 64 | 4 | August 31, 2025 | 99,999% over the limit |
| Whole effluent toxicity | 0 | 10 | 2 | March 31, 2018 | 48% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 85 | 1 | May 31, 2015 | 10% over the limit |
| pH | 3 | 45 | 1 | May 31, 2012 | |
| Oxygen, dissolved [DO] | 1 | 23 | 1 | August 31, 2011 | 3% over the limit |
| Chlorine, total residual | 2 | 43 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 28 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 28 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 26 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 26 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 24 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 24 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 24 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 13 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 13 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 5 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 5 | 0 | ||
| Chloride [as Cl] | 0 | 3 | 0 | ||
| Solids, total dissolved | 0 | 3 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Arsenic, dry weight | 5 | 0 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 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 | ||
| Fecal coliform | 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 | ||
| Compliance w/part 258 sludge requirement | 1 | 0 | 0 | ||
| Boundary areas | 1 | 0 | 0 | ||
| Salmonella | 1 | 0 | 0 | ||
| Pollutant table from 503.13 | 1 | 0 | 0 |
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 16, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| July 9, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES TX0076856.
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 TX0076856.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.