Clean Water Act discharge permit · NPDES TX0109126

WEST HARRIS COUNTY MUD 21 WWTP, Houston, TX: NPDES TX0109126 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
8Pollutants under a numeric limit
6Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

WEST HARRIS COUNTY MUD 21 WWTP, held by WEST HARRIS COUNTY MUD 21, holds NPDES permit TX0109126, which discharges to Hcfcdd E141-00-00, Whiteoak Bayou. EPA’s file records it issued March 3, 2022 and expiring March 3, 2027.

WEST HARRIS COUNTY MUD 21 WWTP, Houston, Texas: Individual permit TX0109126, held by WEST HARRIS COUNTY MUD 21; Publicly owned treatment works; Effective; issued March 3, 2022, term to March 3, 2027; discharges to HCFCDD E141-00-00, WHITEOAK BAYOU.

Solids, total suspended: 3 limits, 41 violations of any kind, 32 effluent exceedances, latest July 31, 2026, largest 297% over the limit.
Nitrogen, ammonia total [as N]: 6 limits, 18 violations of any kind, 12 effluent exceedances, latest February 28, 2025, largest 231% over the limit.
Flow, in conduit or thru treatment plant: 2 limits, 10 violations of any kind, 4 effluent exceedances, latest June 30, 2026, largest 17% over the limit.
Chlorine, total residual: 2 limits, 8 violations of any kind, 4 effluent exceedances, latest May 31, 2026, largest 17% over the limit.
E. coli: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest August 31, 2025, largest 174% over the limit.
pH: 2 limits, 5 violations of any kind, 1 effluent exceedance, latest April 30, 2026.
BOD, carbonaceous [5 day, 20 C]: 3 limits, 9 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 0 effluent exceedances.

October 11, 2024: Permit Violations - Violation Specified in Comment (ST6).

Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 1,586 were issued before TX0109126.

Coverages issued nearest TX0109126

February 11, 2022: CONROE FEEDER ZONE ELEMENTARY SCHOOL FLEX 21 WWTP, Montgomery, TX0141194, held by CONROE ISD
February 17, 2022: N B DAVIDSON SOUTH WWTP, Huntsville, TX0022373, held by HUNTSVILLE, CITY OF
February 17, 2022: PECOS WWTP, Reeves County, TX0137693, held by TOWN OF PECOS CITY
February 17, 2022: FORT BEND COUNTY MUD NO 162 WWTP NO 2, Rosenberg, TX0141267, held by FORT BEND COUNTY MUD 162
February 28, 2022: TOWN OF LAKEWOOD VILLAGE WWTP, Lakewood Village, TX0026565, held by TOWN OF LAKEWOOD VILLAGE
March 10, 2022: FORT BEND COUNTY MUD 58 WWTP, Fort Bend County, TX0126675, held by FORT BEND COUNTY MUD 58
March 14, 2022: MORGANS POINT WWTP, Morgans Point, TX0027260, held by CITY OF MORGANS POINT
March 14, 2022: BRIDGESTONE MUD WWTP NO. 2, Tomball, TX0140643, held by BRIDGESTONE MUD
March 18, 2022: CITY OF WILLOW PARK WWTP, Willow Park, TX0141259, held by WILLOW PARK, CITY OF
March 18, 2022: DENBURY WEST WWTP, Conroe, TX0141313, held by MONTGOMERY COUNTY MUD 163

WEST HARRIS COUNTY MUD 21 WWTP among its neighbors

EPA’s permit file holds 309 discharge permits in the Cole Creek-Whiteoak Bayou subwatershed (HUC 120401040302), TX0109126 among them. Its county holds 4,455, 195 of them major permits; TX0109126 is a minor permit.

Other permits in the Cole Creek-Whiteoak Bayou subwatershed (HUC 120401040302)

249 AUTO PARTS, Houston: TXR05FV48, minor permit, permit term to August 13, 2026
3 MEN MOVERS HOUSTON, Houston: TXR1502XH, minor permit, discharging to COLE CREEK, permit term to March 4, 2028
7101 BREEN DRIVE FACILITY, Houston: TXRNEBR66, minor permit, permit term to August 13, 2026
7101 HOLLISTER, Houston: TXR1573YB, minor permit, discharging to COLE CREEK, permit term to March 4, 2028
AAAR TELL HOUSTON, Houston: TXRNECD51, minor permit, permit term to August 13, 2026
ACC HOU - CRAWFORD, Houston: TXR05GR40, minor permit, permit term to August 13, 2026
ACRES HOMES LAND HOLDINGS, Houston: TXR1572WL, minor permit, discharging to WHITE OAK ABOVE TIDAL, permit term to March 4, 2028
ADMIRAL TRANSFER AND RIGGING, Houston: TXR05W493, minor permit, permit term to August 13, 2026
ADVANCED AUTO PARTS DISTRIBUTION CENTER 49, Houston: TXR05GT69, minor permit, permit term to August 13, 2026
ADVANCED MILLING CONCEPTS, Houston: TXRNEBY41, minor permit, permit term to August 13, 2026

Identity

Facility as filed	WEST HARRIS COUNTY MUD 21 WWTP
Permittee as filed	WEST HARRIS COUNTY MUD 21
NPDES ID	TX0109126
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	March 3, 2022
Expiration date	March 3, 2027
Address	Houston, TX 77064
Receiving water	HCFCDD E141-00-00, WHITEOAK BAYOU
Subwatershed	Cole Creek-Whiteoak Bayou (HUC 120401040302)
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

8Pollutants on file
8Under a numeric limit
8With a violation of any kind
6With 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
Solids, total suspended	3	41	32	July 31, 2026	297% over the limit
Nitrogen, ammonia total [as N]	6	18	12	February 28, 2025	231% over the limit
Flow, in conduit or thru treatment plant	2	10	4	June 30, 2026	17% over the limit
Chlorine, total residual	2	8	4	May 31, 2026	17% over the limit
E. coli	2	2	2	August 31, 2025	174% over the limit
pH	2	5	1	April 30, 2026
BOD, carbonaceous [5 day, 20 C]	3	9	0
Oxygen, dissolved [DO]	1	2	0

Inspections, violations and enforcement

1Single-event violations

Date	What EPA recorded	Agency
October 11, 2024	Permit Violations - Violation Specified in Comment	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0109126.

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 TX0109126.

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

This public-records page covers the NPDES discharge permit TX0109126 held by WEST HARRIS COUNTY MUD 21 for the WEST HARRIS COUNTY MUD 21 WWTP in Houston, TX, which discharges to Whiteoak Bayou (HCFCDD E141-00-00) and is listed as Effective and a Minor discharger. The page lists 8 pollutants on file, 6 of them under a numeric limit, and 6 with an effluent exceedance.