Clean Water Act discharge permit · NPDES TX0123901

PANTHER CREEK WWTP, Denton County, TX: NPDES TX0123901 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
20Pollutants under a numeric limit
3Pollutants with an effluent exceedance

PANTHER CREEK WWTP, held by NORTH TEXAS MWD, holds NPDES permit TX0123901, which discharges to Lewisville Lake. EPA’s file records it issued April 14, 2021 and expiring April 14, 2026. 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	PANTHER CREEK WWTP
Permittee as filed	NORTH TEXAS MWD
NPDES ID	TX0123901
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	April 14, 2021
Expiration date	April 14, 2026
Address	Denton County, TX 75034
Receiving water	Lewisville Lake
Subwatershed	Panther Creek-Little Elm Reservoir (HUC 120301030904)
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

20Pollutants on file
20Under a numeric limit
3With 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
Nitrogen, ammonia total [as N]	6	6	6	July 31, 2024	40% over the limit
Phosphorus, total [as P]	3	6	6	February 28, 2026	83% over the limit
Flow, in conduit or thru treatment plant	4	3	2	September 30, 2010	357% over the limit
BOD, carbonaceous [5 day, 20 C]	6	0	0
Solids, total suspended	3	0	0
Whole effluent toxicity - retest #1	3	0	0
Whole effluent toxicity - retest #2	3	0	0
pH	2	0	0
E. coli	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
Oxygen, dissolved [DO]	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

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

1Single-event violations

Date	What EPA recorded	Agency
January 19, 2023	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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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0123901 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers NPDES permit TX0123901 for the PANTHER CREEK WWTP in Denton County, TX, held by NORTH TEXAS MWD and discharging to Lewisville Lake. The permit is listed as administratively continued, with 20 as its major discharger class, 3 pollutants under a numeric limit, and 3 pollutants with an effluent exceedance. The permit was issued April 14, 2021 and expired April 14, 2026, with status as of October 14, 2026.