Clean Water Act discharge permit · NPDES TX0078565
BUFFALO CREEK WWTP, Rockwall, TX: NPDES TX0078565 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 50Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
BUFFALO CREEK WWTP, held by NORTH TEXAS MWD, holds NPDES permit TX0078565, which discharges to Buffalo Creek; E Fork Trinity River. EPA’s file records it issued February 21, 2018 and expiring October 1, 2021.
BUFFALO CREEK WWTP, Rockwall, Texas: Individual permit TX0078565, held by NORTH TEXAS MWD; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued February 21, 2018, term to October 1, 2021; discharges to BUFFALO CREEK; E FORK TRINITY RIVER.
- Nitrogen, ammonia total [as N]: 3 limits, 14 violations of any kind, 8 effluent exceedances, latest November 30, 2017, largest 47% over the limit.
- E. coli: 2 limits, 4 violations of any kind, 4 effluent exceedances, latest April 30, 2025, largest 99,999% over the limit.
- Flow, in conduit or thru treatment plant: 4 limits, 9 violations of any kind, 1 effluent exceedance, latest February 28, 2018, largest 32% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 7 violations of any kind, 1 effluent exceedance, latest June 30, 2022, largest 4% over the limit.
- Chlorine, total residual: 2 limits, 5 violations of any kind, 1 effluent exceedance, latest March 31, 2025, largest 0% over the limit.
- Solids, total suspended: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- pH: 3 limits, 4 violations of any kind, 0 effluent exceedances.
- Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
- Polychlorinated biphenyls [PCBs]: 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.
- Whole effluent toxicity - retest #1: 3 limits, 0 violations of any kind, 0 effluent exceedances.
- Whole effluent toxicity - retest #2: 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.
- IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Fecal coliform: 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.
- 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.
- March 24, 2026: Evaluation (S).
- November 20, 2025: Permit Violations - Violation Specified in Comment (ST6).
- November 15, 2023: Permit Violations - Violation Specified in Comment (ST6).
Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 694 were issued before TX0078565. NORTH TEXAS MWD holds 12 permits in Texas.
Other permits held by NORTH TEXAS MWD
- WYLIE WTP, Wylie: TX0002143, issued May 21, 2014
- SQUABBLE CREEK WWTP, Rockwall County: TX0022241, issued April 19, 2017
- WYLIE WWTP, Wylie: TX0025950, issued September 30, 2008
- SOUTH MESQUITE CREEK REGIONAL WWTP, Mesquite: TX0047431, issued April 27, 2017
- ROWLETT CREEK REGIONAL WWTP, Plano: TX0047911, issued January 23, 2017
- WILSON CREEK REGIONAL WWTP, Lucas: TX0088633, issued October 26, 2017
- STEWART CREEK WEST WWTP, Denton County: TX0103501, issued August 31, 2017
- PANTHER CREEK WWTP, Denton County: TX0123901, issued April 14, 2021
- TAWAKONI WTP, Terrell: TX0133281, issued June 23, 2016
- NTMWD LEONARD WTP, Leonard: TX0133671, issued January 3, 2018
Coverages issued nearest TX0078565
- February 15, 2018: HARRIS COUNTY MUD 221 WWTP, Houston, TX0089184, held by HARRIS COUNTY MUD 221
- 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: HARRIS COUNTY MUD 531 WWTP, Cypress, TX0135119, held by HARRIS COUNTY MUD 531
- 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
BUFFALO CREEK WWTP among its neighbors
EPA’s permit file holds 86 discharge permits in the Long Branch-Buffalo Creek subwatershed (HUC 120301060502), TX0078565 among them. Its county holds 219, 3 of them major permits; TX0078565 is a major permit.
Other permits in the Long Branch-Buffalo Creek subwatershed (HUC 120301060502)
- AGAVE WIRE, Rockwall: TXRNEBR38, minor permit, permit term to August 13, 2026
- BRISTOL VALLEY - HOME BUILDING, Heath: TXR1558WT, minor permit, discharging to BUFFALO CREEK, permit term to March 4, 2028
- BRISTOL VALLEY HOMEBUILDING, Heath: TXR1585WY, minor permit, discharging to LONG BRANCH, permit term to March 4, 2028
- BRISTOL VALLEY OFFSITE, Heath: TXR1583VA, minor permit, discharging to LONG BRANCH, permit term to March 4, 2028
- BRISTOL VALLEY PHASE 1, Heath: TXR1507SF, minor permit, discharging to TRIBUTARY OF LONG BRANCH, permit term to March 4, 2028
- BRISTOL VALLEY PHASE 1, Heath: TXR1512SF, minor permit, discharging to TRIBUTARY OF LONG BEACH, permit term to March 4, 2028
- BRISTOL VALLEY PHASE 1, Heath: TXR1533UO, minor permit, discharging to TRIBUTARY OF LONG BRANCH, permit term to March 4, 2028
- BUFFALO CREEK WWTP, Rockwall: TX0066401, minor permit, discharging to BUFFALO CREEK; EAST FORK TRINITY RV, permit term to October 1, 2011
- CHANNELL ROCKWALL TEXAS, Rockwall: TXR05GV92, minor permit, permit term to August 13, 2026
- CHEWTERS CHOCOLATE, Rockwall: TXR1567SG, minor permit, discharging to LAKE RAY HUBBARD, permit term to March 4, 2028
Identity
| Facility as filed | BUFFALO CREEK WWTP |
|---|---|
| Permittee as filed | NORTH TEXAS MWD |
| NPDES ID | TX0078565 |
| 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 | February 21, 2018 |
| Expiration date | October 1, 2021 |
| Address | Rockwall, TX 75098 |
| Receiving water | BUFFALO CREEK; E FORK TRINITY RIVER |
| Subwatershed | Long Branch-Buffalo Creek (HUC 120301060502) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Effluent limits and exceedances
- 50Pollutants on file
- 50Under a numeric limit
- 9With a violation of any kind
- 5With 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 | 14 | 8 | November 30, 2017 | 47% over the limit |
| E. coli | 2 | 4 | 4 | April 30, 2025 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 9 | 1 | February 28, 2018 | 32% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 7 | 1 | June 30, 2022 | 4% over the limit |
| Chlorine, total residual | 2 | 5 | 1 | March 31, 2025 | 0% over the limit |
| Solids, total suspended | 3 | 6 | 0 | ||
| pH | 3 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 2 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 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 | ||
| Whole effluent toxicity - retest #1 | 3 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 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 | ||
| IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| Fecal coliform | 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 | ||
| 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 |
|---|---|---|
| November 20, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| November 15, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| March 24, 2026 | Evaluation | S |
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 TX0078565.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.