Clean Water Act discharge permit · NPDES TX0053112
STEWART CREEK WWTP, Denton County, TX: NPDES TX0053112 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 56Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
STEWART CREEK WWTP, held by THE COLONY, CITY OF, holds NPDES permit TX0053112, which discharges to Directly Lewisville Lake. EPA’s file records it issued January 10, 2017 and expiring October 1, 2021. 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 | STEWART CREEK WWTP |
|---|---|
| Permittee as filed | THE COLONY, CITY OF |
| NPDES ID | TX0053112 |
| 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 | January 10, 2017 |
| Expiration date | October 1, 2021 |
| Address | Denton County, TX 75056 |
| Receiving water | DIRECTLY LEWISVILLE LAKE |
| Subwatershed | Stewart Creek-Little Elm Reservoir (HUC 120301030906) |
| 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
- 58Pollutants on file
- 56Under a numeric limit
- 46With a violation of any kind
- 9With 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] | 9 | 186 | 169 | December 31, 2022 | 800% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 34 | 17 | February 28, 2006 | 532% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 95 | 16 | May 31, 2019 | 35% over the limit |
| E. coli | 2 | 45 | 9 | May 31, 2024 | 154% over the limit |
| Phosphorus, total [as P] | 6 | 23 | 5 | August 31, 2022 | 30% over the limit |
| Solids, total suspended | 6 | 19 | 4 | February 28, 2006 | 72% over the limit |
| Oxygen, dissolved [DO] | 1 | 24 | 2 | October 31, 2012 | 14% over the limit |
| Chlorine, total residual | 0 | 20 | 1 | December 31, 2005 | 100% over the limit |
| Coliform, fecal general | 0 | 3 | 1 | April 30, 2007 | 18% over the limit |
| Cadmium, total [as Cd] | 6 | 118 | 0 | ||
| Copper, total [as Cu] | 6 | 117 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 28 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 28 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 28 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 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 | ||
| LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas | 2 | 26 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas | 2 | 24 | 0 | ||
| LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas | 2 | 24 | 0 | ||
| pH | 3 | 10 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 5 | 9 | 0 | ||
| Arsenic, dry weight | 5 | 6 | 0 | ||
| Selenium, dry weight | 3 | 6 | 0 | ||
| Copper, dry weight | 3 | 6 | 0 | ||
| Cadmium, dry weight | 3 | 6 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 6 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 6 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 6 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 6 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 6 | 0 | ||
| Whole effluent toxicity - retest #1 | 3 | 4 | 0 | ||
| Whole effluent toxicity - retest #2 | 3 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute D. Pulex | 1 | 4 | 0 | ||
| LC50 Pass/Fail Static 24Hr Acute Pimephales promelas | 1 | 4 | 0 | ||
| Level of pathogen requirements achieved | 2 | 3 | 0 | ||
| Description of pathogen option used | 2 | 3 | 0 | ||
| Vector attraction reduction alternative used | 2 | 3 | 0 | ||
| Pollutant table from 503.13 | 1 | 3 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 2 | 0 | ||
| Salmonella | 1 | 2 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 1 | 0 | ||
| Annual whole sludge application rate | 1 | 1 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Fecal coliform | 1 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 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 | ||
| Boundary areas | 1 | 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
- 8Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 22, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| March 19, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| February 16, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| September 13, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| June 28, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| April 8, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| January 24, 2019 | Permit Violations - Violation Specified in Comment | ST6 |
| January 24, 2017 | 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.