Clean Water Act discharge permit · NPDES TX0133531

DALLAS ZOO, Dallas, TX: NPDES TX0133531 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
7Pollutants under a numeric limit
3Pollutants with an effluent exceedance

DALLAS ZOO, held by CITY OF DALLAS PARK AND RECREATION, holds NPDES permit TX0133531, which discharges to Cedar Creek;Drainage Ditch;Cedar Ck. EPA’s file records it issued September 26, 2017 and expiring December 1, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	DALLAS ZOO
Permittee as filed	CITY OF DALLAS PARK AND RECREATION
NPDES ID	TX0133531
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	September 26, 2017
Expiration date	December 1, 2021
Address	Dallas, TX 75203
Receiving water	CEDAR CREEK;DRAINAGE DITCH;CEDAR CK
Subwatershed	Turtle Creek-Trinity River (HUC 120301050102)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

7Pollutants on file
7Under 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
Oxygen demand, chem. [high level] [COD]	4	11	11	November 30, 2021	329% over the limit
E. coli	5	10	10	April 30, 2022	99,999% over the limit
Oil & Grease	4	2	2	June 30, 2023	135% over the limit
pH	8	0	0
Flow, in conduit or thru treatment plant	8	0	0
Nitrogen, ammonia total [as N]	1	0	0
BOD, carbonaceous [5 day, 20 C]	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
October 16, 2024	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.

Watch this permit

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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 TX0133531 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers the NPDES discharge permit TX0133531 held by the City of Dallas Park and Recreation for the Dallas Zoo in Dallas, TX, which is administratively continued as a minor discharger and discharges to Cedar Creek, Drainage Ditch and Cedar Ck. The facts list 7 pollutants on file, 3 of them under a numeric limit, and 3 with a violation of any kind. The permit's status and dates reflect EPA's permit file as it stood when the record was loaded on September 15, 2026.