Clean Water Act discharge permit · NPDES TX0031585

TDCJ DARRINGTON WWTP, Rosharon, TX: NPDES TX0031585 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
38Pollutants under a numeric limit
7Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

TDCJ DARRINGTON WWTP, held by TEXAS DEPARTMENT OF CRIMINAL JUSTICE, holds NPDES permit TX0031585, which discharges to Oyster Creek Above Tidal. EPA’s file records it issued October 29, 2018 and expiring October 29, 2023.

TDCJ DARRINGTON WWTP, Rosharon, Texas: Individual permit TX0031585, held by TEXAS DEPARTMENT OF CRIMINAL JUSTICE; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued October 29, 2018, term to October 29, 2023; discharges to OYSTER CREEK ABOVE TIDAL.

Nitrogen, ammonia total [as N]: 3 limits, 76 violations of any kind, 23 effluent exceedances, latest September 30, 2025, largest 332% over the limit.
Oxygen, dissolved [DO]: 1 limit, 29 violations of any kind, 12 effluent exceedances, latest July 31, 2026, largest 65% over the limit.
Flow, in conduit or thru treatment plant: 2 limits, 45 violations of any kind, 11 effluent exceedances, latest July 31, 2026, largest 15% over the limit.
Chlorine, total residual: 2 limits, 41 violations of any kind, 7 effluent exceedances, latest April 30, 2024, largest 97% over the limit.
Solids, total suspended: 3 limits, 52 violations of any kind, 4 effluent exceedances, latest November 30, 2018, largest 35% over the limit.
pH: 3 limits, 38 violations of any kind, 3 effluent exceedances, latest February 28, 2023.
E. coli: 2 limits, 3 violations of any kind, 3 effluent exceedances, latest August 31, 2017, largest 99,999% over the limit.
BOD, carbonaceous [5 day, 20 C]: 3 limits, 51 violations of any kind, 0 effluent exceedances.
Arsenic, dry weight: 5 limits, 15 violations of any kind, 0 effluent exceedances.
Chromium, sludge, total, dry weight [as Cr]: 5 limits, 15 violations of any kind, 0 effluent exceedances.
Selenium, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Copper, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Cadmium, dry weight: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Zinc, sludge, total, dry weight [as Zn]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Lead, sludge, total, dry weight [as Pb]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Nickel, sludge, total, dry weight [as Ni]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Mercury, sludge, total, dry weight [as Hg]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Nickel, total [as Ni]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Level of pathogen requirements achieved: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Description of pathogen option used: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Vector attraction reduction alternative used: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Fecal coliform: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Salmonella: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Unit w/liner/leachate collection system: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Boundary areas: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Pollutant table from 503.13: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Polychlorinated biphenyls [PCBs]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Toxicity characteristic leaching procedure: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual whole sludge application rate: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Ann. amt sludge disposed by other method: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual amt of sludge incinerated: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual sludge production, total: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual amount of sludge land applied: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual amt. sludge disposed surface unit: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual amt sludge disposed in landfill: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Annual amt sludge transported interstate: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Compliance w/part 258 sludge requirement: 1 limit, 2 violations of any kind, 0 effluent exceedances.

January 28, 2025: Permit Violations - Violation Specified in Comment (ST6).
May 6, 2021: Permit Violations - Violation Specified in Comment (ST6).

Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 917 were issued before TX0031585. TEXAS DEPARTMENT OF CRIMINAL JUSTICE holds 16 permits in Texas.

Other permits held by TEXAS DEPARTMENT OF CRIMINAL JUSTICE

TDCJ CLEMENS UNIT WWTP, Brazoria: TX0031569, issued August 9, 2019
TDJC COFFIELD UNIT, Anderson County: TX0031577, issued May 24, 2017
TDCJ WAINRIGHT UNIT, Houston County: TX0031593, issued February 28, 2017
TDCJ ELLIS UNIT WWTP, Huntsville: TX0031607, issued March 13, 2017
TDCJ FERGUSON UNIT WWTP, Madison County: TX0031615, issued February 14, 2017
SCOTT UNIT - WWTP, Brazoria County: TX0031658, issued June 26, 2012
TDCJ JESTER I UNIT WWTP, Richmond: TX0031674, issued December 12, 2013
TDCJ BETO UNIT WWTP, Anderson County: TX0075388, issued May 9, 2017
TDCJ WALLACE PACK UNIT WWTP, Navasota: TX0089010, issued August 12, 2019
TDCJ LUTHER WWTP, Navasota: TX0089028, issued October 23, 2019

Coverages issued nearest TX0031585

October 24, 2018: RENN ROAD MUD WWTP, Houston, TX0078964, held by RENN ROAD MUD
October 24, 2018: WEST HARRIS COUNTY MUD 4 WWTP, Houston, TX0079359, held by WEST HARRIS COUNTY MUD 4
October 24, 2018: CITY OF SHENANDOAH WWTP, Shenandoah, TX0093564, held by SHENANDOAH,CITY OF
October 24, 2018: FORT BEND COUNTY MUD 81 WWTP, Fulshear, TX0106046, held by FORT BEND COUNTY MUD NO 81
October 24, 2018: ROB AND AMP BESSIE WELDER PARK, Sinton, TX0110361, held by CITY OF SINTON
October 29, 2018: JEFFERSON COUNTY WCID 10 WWTF, Nederland, TX0111589, held by JEFFERSON COUNTY WCID 10
October 29, 2018: BRAZORIA COUNTY MUD 30 WWTP, Brazoria County, TX0126055, held by BRAZORIA COUNTY MUD NO. 30
October 29, 2018: GENERATION PARK MANAGEMENT DISTRICT WWTP 2, Houston, TX0133213, held by GENERATION PARK MANAGEMENT DISTRICT
October 29, 2018: CITY OF DECATUR WATER PLANT, Decatur, TX0136204, held by CITY OF DECATUR
October 30, 2018: SAGEMONT WWTP, Houston, TX0063070, held by HOUSTON, CITY OF

TDCJ DARRINGTON WWTP among its neighbors

EPA’s permit file holds 149 discharge permits in the Middle Oyster Creek subwatershed (HUC 120402050200), TX0031585 among them. Its county holds 522, 24 of them major permits; TX0031585 is a minor permit.

Other permits in the Middle Oyster Creek subwatershed (HUC 120402050200)

1172 FM 655, Rosharon: TXR1538XG, minor permit, discharging to AUSTIN BAYOU, permit term to March 4, 2028
12-INCH GRAVITY SEWER MAIN - MISSOURI CITY, Missouri City: TXR1527NQ, minor permit, discharging to OYSTER CREEK, permit term to March 4, 2028
ANNISTON SECTION 13, Katy: TXR1597VR, minor permit, discharging to BEAR CREEK, permit term to March 4, 2028
ANNISTON SECTION 17, Katy: TXR1598VB, minor permit, discharging to BEAR CREEK, permit term to March 4, 2028
ANNISTON SECTION SECTION 1 2 3 & 5, Katy: TXR1584OO, minor permit, discharging to BEAR CREEK, permit term to March 4, 2028
ASHLAND, Angleton: TXR1515WE, minor permit, discharging to STYLES BAYOU, permit term to March 4, 2028
BWSC RESERVOIR PROJECT - OYSTER CREEK IMPROVEMENTS, Brazoria County: TXR1512UT, minor permit, discharging to OYSTER CREEK, permit term to March 4, 2028
BWSC RESERVOIR PROJECT - RESERVOIR CONSTRUCTION, Angleton: TXR1562VG, minor permit, discharging to OYSTER CREEK, permit term to March 4, 2028
CALDWELL RANCH, Iowa Colony: TXR1584NR, minor permit, discharging to CHOCALATE BAYOU, permit term to March 4, 2028
CALDWELL RANCH, Rosharon: TXR1596UJ, minor permit, discharging to OYSTER CREEK ABOVE TIDAL, permit term to March 4, 2028

Identity

Facility as filed	TDCJ DARRINGTON WWTP
Permittee as filed	TEXAS DEPARTMENT OF CRIMINAL JUSTICE
NPDES ID	TX0031585
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	October 29, 2018
Expiration date	October 29, 2023
Address	Rosharon, TX 77583
Receiving water	OYSTER CREEK ABOVE TIDAL
Receiving water impaired	303(D) Listed
Subwatershed	Middle Oyster Creek (HUC 120402050200)
SIC	9223 – Correctional Institutions

Effluent limits and exceedances

38Pollutants on file
38Under a numeric limit
38With 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
Nitrogen, ammonia total [as N]	3	76	23	September 30, 2025	332% over the limit
Oxygen, dissolved [DO]	1	29	12	July 31, 2026	65% over the limit
Flow, in conduit or thru treatment plant	2	45	11	July 31, 2026	15% over the limit
Chlorine, total residual	2	41	7	April 30, 2024	97% over the limit
Solids, total suspended	3	52	4	November 30, 2018	35% over the limit
pH	3	38	3	February 28, 2023
E. coli	2	3	3	August 31, 2017	99,999% over the limit
BOD, carbonaceous [5 day, 20 C]	3	51	0
Arsenic, dry weight	5	15	0
Chromium, sludge, total, dry weight [as Cr]	5	15	0
Selenium, dry weight	3	9	0
Copper, dry weight	3	9	0
Cadmium, dry weight	3	9	0
Molybdenum, sludge, total, dry weight [as Mo]	3	9	0
Zinc, sludge, total, dry weight [as Zn]	3	9	0
Lead, sludge, total, dry weight [as Pb]	3	9	0
Nickel, sludge, total, dry weight [as Ni]	3	9	0
Mercury, sludge, total, dry weight [as Hg]	3	9	0
Nickel, total [as Ni]	2	6	0
Level of pathogen requirements achieved	2	6	0
Description of pathogen option used	2	6	0
Vector attraction reduction alternative used	2	6	0
Fecal coliform	1	4	0
Salmonella	1	4	0
Unit w/liner/leachate collection system	1	3	0
Boundary areas	1	3	0
Pollutant table from 503.13	1	3	0
Polychlorinated biphenyls [PCBs]	1	2	0
Toxicity characteristic leaching procedure	1	2	0
Annual whole sludge application rate	1	2	0
Ann. amt sludge disposed by other method	1	2	0
Annual amt of sludge incinerated	1	2	0
Annual sludge production, total	1	2	0
Annual amount of sludge land applied	1	2	0
Annual amt. sludge disposed surface unit	1	2	0
Annual amt sludge disposed in landfill	1	2	0
Annual amt sludge transported interstate	1	2	0
Compliance w/part 258 sludge requirement	1	2	0

Inspections, violations and enforcement

2Single-event violations

Date	What EPA recorded	Agency
January 28, 2025	Permit Violations - Violation Specified in Comment	ST6
May 6, 2021	Permit Violations - Violation Specified in Comment	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0031585.

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 TX0031585.

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

This public-records page covers NPDES permit TX0031585 for the TDCJ DARRINGTON WWTP in Rosharon, TX, held by the TEXAS DEPARTMENT OF CRIMINAL JUSTICE, with its status as of October 14, 2026, as loaded from EPA's permit file. The permit is administratively continued, classed as a Minor discharger, and lists 7 pollutants under a numeric limit, of which 7 had an effluent exceedance. The discharge is to OYSTER CREEK ABOVE TIDAL, within the Middle Oyster Creek (HUC 120402050200) subwatershed.