Clean Water Act discharge permit · NPDES TX0023931
FLOYD BRANCH REGIONAL WWTP, Richardson, TX: NPDES TX0023931 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 21Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
FLOYD BRANCH REGIONAL WWTP, held by NORTH TEXAS MUNICIPAL WATER DISTRICT, holds NPDES permit TX0023931, which discharges to Floyd Branch/Cottonwood Ck;White Rock Ck. EPA’s file records it issued October 8, 2020 and expiring October 8, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | FLOYD BRANCH REGIONAL WWTP |
|---|---|
| Permittee as filed | NORTH TEXAS MUNICIPAL WATER DISTRICT |
| NPDES ID | TX0023931 |
| 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 | October 8, 2020 |
| Expiration date | October 8, 2023 |
| Address | Richardson, TX 75081 |
| Receiving water | FLOYD BRANCH/COTTONWOOD CK;WHITE ROCK CK |
| Subwatershed | Floyd Branch-White Rock Creek (HUC 120301050104) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 36Pollutants on file
- 21Under a numeric limit
- 26With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 4 | 24 | 22 | January 31, 2025 | 131% over the limit |
| E. coli | 2 | 17 | 15 | October 31, 2025 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 8 | 8 | August 31, 2021 | 221% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 6 | 3 | August 31, 2021 | 948% over the limit |
| Copper, total [as Cu] | 3 | 3 | 3 | December 31, 2010 | 24% over the limit |
| Oxygen, dissolved [DO] | 1 | 2 | 1 | August 31, 2021 | 28% over the limit |
| pH | 2 | 1 | 1 | August 31, 2021 | |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 0 | 6 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 0 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 0 | 6 | 0 | ||
| Whole effluent toxicity | 0 | 4 | 0 | ||
| Diazinon | 0 | 4 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 2 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 2 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 0 | 2 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 0 | 2 | 0 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 0 | 2 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 1 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 1 | 0 | ||
| Chlorine, total residual | 0 | 1 | 0 | ||
| Solids, total suspended | 3 | 0 | 0 | ||
| Lead, total [as Pb] | 3 | 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 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 22, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
| January 18, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| March 2, 2022 | Permit Violations - Violation Specified in Comment | ST6 |
| August 12, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| June 18, 2020 | Permit Violations - Violation Specified in Comment | ST6 |
| May 15, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.