Clean Water Act discharge permit · NPDES TX0135119
HARRIS COUNTY MUD 531 WWTP, Cypress, TX: NPDES TX0135119 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
HARRIS COUNTY MUD 531 WWTP, held by HARRIS COUNTY MUD 531, holds NPDES permit TX0135119, which discharges to Ditch; Little Cypress Creek; Cypress Creek. EPA’s file records it issued February 21, 2018 and expiring February 1, 2023.
HARRIS COUNTY MUD 531 WWTP, Cypress, Texas: Individual permit TX0135119, held by HARRIS COUNTY MUD 531; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued February 21, 2018, term to February 1, 2023; discharges to DITCH; LITTLE CYPRESS CREEK; CYPRESS CREEK.
- Solids, total suspended: 3 limits, 7 violations of any kind, 3 effluent exceedances, latest August 31, 2016, largest 113% over the limit.
- E. coli: 2 limits, 6 violations of any kind, 2 effluent exceedances, latest March 31, 2023, largest 893% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 5 violations of any kind, 1 effluent exceedance, latest January 31, 2021, largest 5% over the limit.
- Nitrogen, ammonia total [as N]: 3 limits, 4 violations of any kind, 0 effluent exceedances.
- pH: 3 limits, 2 violations of any kind, 0 effluent exceedances.
- Flow, in conduit or thru treatment plant: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Chlorine, total residual: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 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.
- Polychlorinated biphenyls [PCBs]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Toxicity characteristic leaching procedure: 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.
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 694 were issued before TX0135119.
Coverages issued nearest TX0135119
- February 15, 2018: HARRIS COUNTY MUD 365 WWTP, Houston, TX0116009, held by HARRIS COUNTY MUD 365
- February 15, 2018: CYPRESS CREEK WWTP, Cypress, TX0117854, held by HARRIS COUNTY MUD 500
- February 15, 2018: FORT BEND COUNTY MUD 122 WWTP, Fort Bend County, TX0122556, held by FORT BEND COUNTY MUD 122
- February 21, 2018: NORTHSIDE WWTP, Houston County, TX0070831, held by CROCKETT, CITY OF
- February 21, 2018: BUFFALO CREEK WWTP, Rockwall, TX0078565, held by NORTH TEXAS MWD
- March 8, 2018: ROSEHILL RESERVE-HARRIS COUNTY MUD 542 WWTP 1, Tomball, TX0135925, held by HARRIS COUNTY MUD 542
- March 9, 2018: WOODFOREST INTERIM 1 WWTP, Conroe, TX0129674, held by MONTGOMERY COUNTY MUD 113
- March 12, 2018: TIMBERLAKE WWTP, Houston, TX0046868, held by TIMBERLAKE IMPROVEMENT DISTRICT
- March 12, 2018: ATASCOCITA REGIONAL WWTP, Houston, TX0058963, held by HARRIS COUNTY MUD 109
- March 12, 2018: HARRIS COUNTY MUD 36 WWTP, Houston, TX0084085, held by HARRIS COUNTY MUD 36
HARRIS COUNTY MUD 531 WWTP among its neighbors
EPA’s permit file holds 145 discharge permits in the Little Cypress Creek subwatershed (HUC 120401020105), TX0135119 among them. Its county holds 4,455, 195 of them major permits; TX0135119 is a minor permit.
Other permits in the Little Cypress Creek subwatershed (HUC 120401020105)
- 270 AC INDUSTRIAL PARK WWTP, Cypress: TX0139173, minor permit, discharging to LITTLE CYPRESS CRK;THENCE CYPRESS CRK, permit term to December 4, 2024
- AFFORDABLE STORAGE FACILITY - II, Hockley: TXR1508QP, minor permit, discharging to UNNAMED TRIBUTARY TO LITTLE CYPRESS CREEK, permit term to March 4, 2028
- AMIRA, Harris County Mud No: TXR15429W, minor permit, discharging to TRIBUTARY OF WILLOW CREEK, permit term to March 4, 2023
- AMIRA DEVELOPMENT - LAND, Tomball: TXR15288O, minor permit, permit term to March 5, 2023
- AMIRA DEVELOPMENT - LAND, Tomball: TXR1544TN, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AMIRA DEVELOPMENT - LAND, Tomball: TXR1588NN, minor permit, discharging to WILLOWCREEK, permit term to March 4, 2028
- AMIRA SEC 13 25 & 26, Tomball: TXR1536RR, minor permit, discharging to TRIBUTARY OF LITTLE CYPRESS CREEK, permit term to March 4, 2028
- ASPHALT PACKAGE 2024-4 HC 24-0325 UPIN 24208MF36K01, Cypress: TXR1518TX, minor permit, discharging to LITTLE CYPRESS CREEK, permit term to March 4, 2028
- AZALEA TRAILS, Cypress: TXR1509XK, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
- AZALEA TRAILS, Cypress: TXR1591UU, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
Identity
| Facility as filed | HARRIS COUNTY MUD 531 WWTP |
|---|---|
| Permittee as filed | HARRIS COUNTY MUD 531 |
| NPDES ID | TX0135119 |
| 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 | February 21, 2018 |
| Expiration date | February 1, 2023 |
| Address | Cypress, TX 77433 |
| Receiving water | DITCH; LITTLE CYPRESS CREEK; CYPRESS CREEK |
| Subwatershed | Little Cypress Creek (HUC 120401020105) |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 38Pollutants on file
- 38Under a numeric limit
- 8With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 7 | 3 | August 31, 2016 | 113% over the limit |
| E. coli | 2 | 6 | 2 | March 31, 2023 | 893% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 5 | 1 | January 31, 2021 | 5% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 4 | 0 | ||
| pH | 3 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 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 | ||
| 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 | ||
| 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0135119.
Inspections
EPA’s inspection file holds no inspection for NPDES TX0135119.
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 TX0135119.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.