Clean Water Act discharge permit · NPDES TX0126756
HARRIS COUNTY MUD 412 WWTP, Houston, TX: NPDES TX0126756 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
- 1Inspections on file
- 1Formal enforcement actions
HARRIS COUNTY MUD 412 WWTP, held by HARRIS COUNTY MUD NO 412, holds NPDES permit TX0126756, which discharges to Williams Gully; Garners Bayou. EPA’s file records it issued December 20, 2017 and expiring December 1, 2022.
HARRIS COUNTY MUD 412 WWTP, Houston, Texas: Individual permit TX0126756, held by HARRIS COUNTY MUD NO 412; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued December 20, 2017, term to December 1, 2022; discharges to WILLIAMS GULLY; GARNERS BAYOU.
- Nitrogen, ammonia total [as N]: 6 limits, 85 violations of any kind, 13 effluent exceedances, latest July 31, 2025, largest 202% over the limit.
- Solids, total suspended: 6 limits, 69 violations of any kind, 6 effluent exceedances, latest February 28, 2025, largest 91% over the limit.
- Flow, in conduit or thru treatment plant: 6 limits, 51 violations of any kind, 1 effluent exceedance, latest August 31, 2017, largest 8% over the limit.
- pH: 3 limits, 51 violations of any kind, 1 effluent exceedance, latest October 31, 2008.
- E. coli: 2 limits, 73 violations of any kind, 0 effluent exceedances.
- BOD, carbonaceous [5 day, 20 C]: 6 limits, 72 violations of any kind, 0 effluent exceedances.
- Chlorine, total residual: 2 limits, 48 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 1 limit, 24 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 5 limits, 17 violations of any kind, 0 effluent exceedances.
- Chromium, sludge, total, dry weight [as Cr]: 5 limits, 17 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
- Nickel, total [as Ni]: 2 limits, 8 violations of any kind, 0 effluent exceedances.
- Level of pathogen requirements achieved: 2 limits, 7 violations of any kind, 0 effluent exceedances.
- Description of pathogen option used: 2 limits, 7 violations of any kind, 0 effluent exceedances.
- Vector attraction reduction alternative used: 2 limits, 7 violations of any kind, 0 effluent exceedances.
- Fecal coliform: 1 limit, 4 violations of any kind, 0 effluent exceedances.
- Unit w/liner/leachate collection system: 1 limit, 4 violations of any kind, 0 effluent exceedances.
- Boundary areas: 1 limit, 4 violations of any kind, 0 effluent exceedances.
- Salmonella: 1 limit, 4 violations of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Ann. amt sludge disposed by other method: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual amt of sludge incinerated: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual sludge production, total: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual amount of sludge land applied: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual amt. sludge disposed surface unit: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual amt sludge disposed in landfill: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual amt sludge transported interstate: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Compliance w/part 258 sludge requirement: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Pollutant table from 503.13: 1 limit, 3 violations of any kind, 0 effluent exceedances.
- Annual whole sludge application rate: 1 limit, 1 violation of any kind, 0 effluent exceedances.
- June 16, 2026: CWA 309A AO For Compliance (EPA).
- February 10, 2026: Permit Violations - Violation Specified in Comment (ST6).
- February 10, 2026: Evaluation (S).
- January 28, 2026: Agency Enforcement Review (State).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 627 were issued before TX0126756.
Coverages issued nearest TX0126756
- 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
- December 20, 2017: SOUTHWEST HARRIS CO MUD 1 WWTP, City Of Missouri City, TX0091979, held by SOUTHWEST HARRIS CO MUD 1
- December 20, 2017: CITY OF WILLOW PARK WWTP, Parker County, TX0099732, held by WILLOW PARK, CITY OF
- December 20, 2017: HARRIS COUNTY MUD 278 WWTP, Houston, TX0127124, held by HARRIS COUNTY MUD 278
- December 21, 2017: HOGGS BAYOU WWTP, Carthage, TX0032361, held by CARTHAGE, CITY OF
- December 21, 2017: CHOCOLATE BAYOU WWTP, Houston, TX0063061, held by CITY OF HOUSTON
- December 21, 2017: BELTWAY WWTP, Houston, TX0065307, held by CITY OF HOUSTON
- December 21, 2017: KEEGANS BAYOU WWTP, Houston, TX0098191, held by HOUSTON, CITY OF
HARRIS COUNTY MUD 412 WWTP among its neighbors
EPA’s permit file holds 94 discharge permits in the Garners Bayou subwatershed (HUC 120401040602), TX0126756 among them. Its county holds 4,455, 195 of them major permits; TX0126756 is a minor permit.
Other permits in the Garners Bayou subwatershed (HUC 120401040602)
- 10.1 ACRES ATASCOCITA RD, Humble: TXR1501OH, minor permit, discharging to GARNERS BAYOU, permit term to March 4, 2028
- 19115 LEE ROAD FACILITY, Humble: TXR05FA60, minor permit, permit term to August 13, 2026
- 19175 LEE ROAD FACILITY, Humble: TXR05FA59, minor permit, permit term to August 13, 2026
- 19577 LEE ROAD FACILITY, Humble: TXR05FA61, minor permit, permit term to August 13, 2026
- AIR GENERAL, Humble: TXRNEX640, minor permit, permit term to August 13, 2026
- AIR NEW ZEALAND AT IAH, Houston: TXRNECQ95, minor permit, permit term to August 13, 2026
- AMAZONCOM SERVICES IAH5, Humble: TXR05FD70, minor permit, permit term to August 13, 2026
- ATASCOCITA REGIONAL WWTP, Houston: TX0058963, major permit, discharging to WILLIAMS GULLY, GARNERS BAYOU, GREE, permit term to December 1, 2022
- ATASCOCITA REGIONAL WWTP, Humble: TXR05GI42, minor permit, permit term to August 13, 2026
- ATASCOCITA VILLAGE MHP WWTP, Harris County: TX0020320, minor permit, discharging to GARNERS BAYOU;GREENS BAYOU TIDAL, permit term to December 1, 2022
Identity
| Facility as filed | HARRIS COUNTY MUD 412 WWTP |
|---|---|
| Permittee as filed | HARRIS COUNTY MUD NO 412 |
| NPDES ID | TX0126756 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 20, 2017 |
| Expiration date | December 1, 2022 |
| Address | Houston, TX 77346 |
| Receiving water | WILLIAMS GULLY; GARNERS BAYOU |
| Subwatershed | Garners Bayou (HUC 120401040602) |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 38Pollutants on file
- 38Under a numeric limit
- 38With a violation of any kind
- 4With 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 | 85 | 13 | July 31, 2025 | 202% over the limit |
| Solids, total suspended | 6 | 69 | 6 | February 28, 2025 | 91% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 51 | 1 | August 31, 2017 | 8% over the limit |
| pH | 3 | 51 | 1 | October 31, 2008 | |
| E. coli | 2 | 73 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 6 | 72 | 0 | ||
| Chlorine, total residual | 2 | 48 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 24 | 0 | ||
| Arsenic, dry weight | 5 | 17 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 17 | 0 | ||
| Selenium, dry weight | 3 | 9 | 0 | ||
| Copper, dry weight | 3 | 9 | 0 | ||
| Cadmium, dry weight | 3 | 9 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 9 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 9 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 9 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 9 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 9 | 0 | ||
| Nickel, total [as Ni] | 2 | 8 | 0 | ||
| Level of pathogen requirements achieved | 2 | 7 | 0 | ||
| Description of pathogen option used | 2 | 7 | 0 | ||
| Vector attraction reduction alternative used | 2 | 7 | 0 | ||
| Fecal coliform | 1 | 4 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 4 | 0 | ||
| Boundary areas | 1 | 4 | 0 | ||
| Salmonella | 1 | 4 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 3 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 3 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 3 | 0 | ||
| Annual amt of sludge incinerated | 1 | 3 | 0 | ||
| Annual sludge production, total | 1 | 3 | 0 | ||
| Annual amount of sludge land applied | 1 | 3 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 3 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 3 | 0 | ||
| Annual amt sludge transported interstate | 1 | 3 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 3 | 0 | ||
| Pollutant table from 503.13 | 1 | 3 | 0 | ||
| Annual whole sludge application rate | 1 | 1 | 0 |
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 10, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| February 10, 2026 | Evaluation | S |
Formal enforcement and penalties
1 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.
| Date | What EPA recorded | Agency | Federal penalty | State or local penalty |
|---|---|---|---|---|
| June 16, 2026 | CWA 309A AO For Compliance | EPA |
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| January 28, 2026 | Agency Enforcement Review | State |
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.