Clean Water Act discharge permit · NPDES TX0135241

HARRIS COUNTY MUD 319 WWTP, Hockley, TX: NPDES TX0135241 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
0Pollutants under a numeric limit
3Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

HARRIS COUNTY MUD 319 WWTP, held by HARRIS COUNTY MUD 319, holds NPDES permit TX0135241, which discharges to Little Cypres Creek;Cypress Creek. EPA’s file records it issued April 26, 2018 and expiring April 26, 2023.

HARRIS COUNTY MUD 319 WWTP, Hockley, Texas: Individual permit TX0135241, held by HARRIS COUNTY MUD 319; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 26, 2018, term to April 26, 2023; discharges to LITTLE CYPRES CREEK;CYPRESS CREEK.

Nitrogen, ammonia total [as N]: 0 limits, 94 violations of any kind, 13 effluent exceedances, latest April 30, 2025, largest 723% over the limit.
Flow, in conduit or thru treatment plant: 0 limits, 65 violations of any kind, 11 effluent exceedances, latest March 31, 2025, largest 27% over the limit.
Solids, total suspended: 0 limits, 88 violations of any kind, 7 effluent exceedances, latest March 31, 2025, largest 239% over the limit.
BOD, carbonaceous [5 day, 20 C]: 0 limits, 81 violations of any kind, 0 effluent exceedances.
pH: 0 limits, 54 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 0 limits, 54 violations of any kind, 0 effluent exceedances.
E. coli: 0 limits, 54 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 0 limits, 27 violations of any kind, 0 effluent exceedances.

October 28, 2026: Letter to Regulated Entity (State).

Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 755 were issued before TX0135241.

Coverages issued nearest TX0135241

April 26, 2018: NORTHWEST HARRIS CO MUD#'S 21,22,23 WWTP, Houston, TX0079821, held by NW HARRISCO MUD NO. 21
April 26, 2018: HARRIS COUNTY MUD 24 WTP, Houston, TX0113123, held by HARRIS COUNTY MUD NO. 180
April 26, 2018: HARRIS COUNTY MUD 383 WWTF, Harris County, TX0115983, held by HARRIS COUNTY MUD 383
April 26, 2018: NORTHGATE CROSSING MUD 2 WWTP, Harris County, TX0119181, held by NORTHGATE CROSSING MUD 2
April 26, 2018: SPRING TRAILS WWTF, Montgomery, TX0128295, held by MONTGOMERY COUNTY MUD 119
April 30, 2018: HUMBLE, CITY OF SOUTHWEST WWTP, Humble, TX0034401, held by CITY OF HUMBLE
April 30, 2018: LONE STAR WWTP, Lone Star, TX0088081, held by CITY OF LONE STAR
May 3, 2018: WICHITA FALLS RESOURCES RECOVERY FACILITY, Wichita Falls, TX0047686, held by WICHITA FALLS CITY OF
May 4, 2018: HARRIS COUNTY WCID NO 110 WWTP, Houston, TX0076481, held by HARRIS COUNTY WCID 110
May 8, 2018: CITY OF DOMINO WWTP, Queen City, TX0136123, held by DOMINO, CITY OF

HARRIS COUNTY MUD 319 WWTP among its neighbors

EPA’s permit file holds 145 discharge permits in the Little Cypress Creek subwatershed (HUC 120401020105), TX0135241 among them. Its county holds 4,455, 195 of them major permits; TX0135241 is a minor permit.

Other permits in the Little Cypress Creek subwatershed (HUC 120401020105)

270 AC INDUSTRIAL PARK WWTP, Cypress: TX0139173, minor permit, discharging to LITTLE CYPRESS CRK;THENCE CYPRESS CRK, permit term to December 4, 2024
AFFORDABLE STORAGE FACILITY - II, Hockley: TXR1508QP, minor permit, discharging to UNNAMED TRIBUTARY TO LITTLE CYPRESS CREEK, permit term to March 4, 2028
AMIRA, Harris County Mud No: TXR15429W, minor permit, discharging to TRIBUTARY OF WILLOW CREEK, permit term to March 4, 2023
AMIRA DEVELOPMENT - LAND, Tomball: TXR15288O, minor permit, permit term to March 5, 2023
AMIRA DEVELOPMENT - LAND, Tomball: TXR1544TN, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
AMIRA DEVELOPMENT - LAND, Tomball: TXR1588NN, minor permit, discharging to WILLOWCREEK, permit term to March 4, 2028
AMIRA SEC 13 25 & 26, Tomball: TXR1536RR, minor permit, discharging to TRIBUTARY OF LITTLE CYPRESS CREEK, permit term to March 4, 2028
ASPHALT PACKAGE 2024-4 HC 24-0325 UPIN 24208MF36K01, Cypress: TXR1518TX, minor permit, discharging to LITTLE CYPRESS CREEK, permit term to March 4, 2028
AZALEA TRAILS, Cypress: TXR1509XK, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028
AZALEA TRAILS, Cypress: TXR1591UU, minor permit, discharging to WILLOW CREEK, permit term to March 4, 2028

Identity

Facility as filed	HARRIS COUNTY MUD 319 WWTP
Permittee as filed	HARRIS COUNTY MUD 319
NPDES ID	TX0135241
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
Program	Publicly owned treatment works
Issued	April 26, 2018
Expiration date	April 26, 2023
Address	Hockley, TX 77447
Receiving water	LITTLE CYPRES CREEK;CYPRESS CREEK
Subwatershed	Little Cypress Creek (HUC 120401020105)
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

8Pollutants on file
0Under a numeric limit
8With 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	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	94	13	April 30, 2025	723% over the limit
Flow, in conduit or thru treatment plant	65	11	March 31, 2025	27% over the limit
Solids, total suspended	88	7	March 31, 2025	239% over the limit
BOD, carbonaceous [5 day, 20 C]	81	0
pH	54	0
Chlorine, total residual	54	0
E. coli	54	0
Oxygen, dissolved [DO]	27	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0135241.

Inspections

EPA’s inspection file holds no inspection for NPDES TX0135241.

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

Date	What EPA recorded	Agency
October 28, 2026	Letter to Regulated Entity	State

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

This public-records page covers Clean Water Act NPDES permit TX0135241, held by HARRIS COUNTY MUD 319 for the HARRIS COUNTY MUD 319 WWTP in Hockley, TX, which discharges to Little Cypres Creek;Cypress Creek within the Little Cypress Creek subwatershed (HUC 120401020105). The permit is listed as administratively continued, with a Minor discharger class of 0, 3 pollutants under a numeric limit, and 3 pollutants with an effluent exceedance. EPA's file records issuance on April 26, 2018 and expiration on April 26, 2023, as of October 14, 2026.