Clean Water Act discharge permit · NPDES TX0135755

MONTGOMERY COUNTY MUD 145 WWTP, Conroe, TX: NPDES TX0135755 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
3Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

MONTGOMERY COUNTY MUD 145 WWTP, held by MONTGOMERY COUNTY MUD NO 145, holds NPDES permit TX0135755, which discharges to Unnamed Trib; E Fork Crystal Crk; Crystal Crk;. EPA’s file records it issued June 14, 2018 and expiring June 14, 2023.

MONTGOMERY COUNTY MUD 145 WWTP, Conroe, Texas: Individual permit TX0135755, held by MONTGOMERY COUNTY MUD NO 145; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued June 14, 2018, term to June 14, 2023; discharges to UNNAMED TRIB; E FORK CRYSTAL CRK; CRYSTAL CRK;.

Solids, total suspended: 3 limits, 51 violations of any kind, 3 effluent exceedances, latest June 30, 2025, largest 112% over the limit.
E. coli: 2 limits, 33 violations of any kind, 1 effluent exceedance, latest September 30, 2025, largest 153% over the limit.
Oxygen, dissolved [DO]: 1 limit, 17 violations of any kind, 1 effluent exceedance, latest November 30, 2025, largest 15% over the limit.
Nitrogen, ammonia total [as N]: 3 limits, 48 violations of any kind, 0 effluent exceedances.
BOD, carbonaceous [5 day, 20 C]: 3 limits, 48 violations of any kind, 0 effluent exceedances.
pH: 2 limits, 32 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 32 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 2 limits, 32 violations of any kind, 0 effluent exceedances.

Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 796 were issued before TX0135755.

Coverages issued nearest TX0135755

June 14, 2018: WESTLAKE MUD 1 WWTP, Houston, TX0053091, held by WESTLAKE MUD NO 1
June 14, 2018: FAULKEY GULLY WWTP, Tomball, TX0072354, held by FAULKEY GULLY MUD
June 14, 2018: CITY OF CLYDE WWTP, Clyde, TX0105201, held by CITY OF CLYDE
June 14, 2018: LAKE MUD WWTP 2, Baytown, TX0127728, held by LAKE MUD
June 14, 2018: WESTON MUD WWTP, Katy, TX0132276, held by WESTON MUD
June 14, 2018: HARRIS COUNTY MUD NO 438, Cypress, TX0136484
June 20, 2018: MOUNT HOUSTON RD MUD WWTP, Houston, TX0023515, held by MOUNT HOUSTON ROAD MUD
June 20, 2018: CITY OF SOUTHSIDE PLACE WWTP, Houston, TX0026972, held by CITY OF SOUTHSIDE PLACE
June 20, 2018: CINCO MUD NO 1 CENTRAL WWTP, Katy, TX0098957, held by CINCO MUD 1
June 28, 2018: FALLBROOK UD WWTP, Houston, TX0021237, held by FALLBROOK UTILITY DISTRICT

MONTGOMERY COUNTY MUD 145 WWTP among its neighbors

EPA’s permit file holds 96 discharge permits in the Crystal Creek subwatershed (HUC 120401010403), TX0135755 among them. Its county holds 1,439, 16 of them major permits; TX0135755 is a minor permit.

Other permits in the Crystal Creek subwatershed (HUC 120401010403)

A-1 HOMES, Conroe: TXR1568OC, minor permit, discharging to WEST FORK OF CRYSTAL CREEK, permit term to March 4, 2028
AMERITEX HDPE, Conroe: TXR1564QZ, minor permit, discharging to EAST FORK CRYSTAL CREEK, permit term to March 4, 2028
ARCOSA CONROE, Conroe: TXR1577YT, minor permit, discharging to WEST FORK CRYSTAL CREEK, permit term to March 4, 2028
ASM - WILLIS, Willis: TXR05GQ72, minor permit, permit term to August 13, 2026
BRIGHT MORNING STAR PLACE, Conroe: TXR1522TI, minor permit, discharging to WEST FORK OF CRYSTAL CREEK, permit term to March 4, 2028
BUILDERS FIRSTSOURCE TRUSS PLANT CNS, Conroe: TXR1598MF, minor permit, permit term to March 4, 2028
CANEY MILLS PHASE 3 DETENTION & MASS GRADING, Conroe: TXR1523OI, minor permit, discharging to UNNAMED TRIBUTARY, permit term to March 4, 2028
CANEY MILLS SEC 9, Conroe: TXR1503YN, minor permit, discharging to CANEY CREEK, permit term to March 4, 2028
CANEY MILLS SUBDIVISION, Conroe: TXR1555EK, minor permit, discharging to CANEY CREEK, permit term to March 4, 2023
CANEY MILLS SUBDIVISION, Conroe: TXR1591OC, minor permit, discharging to CANEY CREEK, permit term to March 4, 2028

Identity

Facility as filed	MONTGOMERY COUNTY MUD 145 WWTP
Permittee as filed	MONTGOMERY COUNTY MUD NO 145
NPDES ID	TX0135755
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	June 14, 2018
Expiration date	June 14, 2023
Address	Conroe, TX 77303
Receiving water	UNNAMED TRIB; E FORK CRYSTAL CRK; CRYSTAL CRK;
Subwatershed	Crystal Creek (HUC 120401010403)

Effluent limits and exceedances

8Pollutants on file
8Under 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	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	3	51	3	June 30, 2025	112% over the limit
E. coli	2	33	1	September 30, 2025	153% over the limit
Oxygen, dissolved [DO]	1	17	1	November 30, 2025	15% over the limit
Nitrogen, ammonia total [as N]	3	48	0
BOD, carbonaceous [5 day, 20 C]	3	48	0
pH	2	32	0
Flow, in conduit or thru treatment plant	2	32	0
Chlorine, total residual	2	32	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0135755.

Inspections

EPA’s inspection file holds no inspection for NPDES TX0135755.

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 TX0135755.

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Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES TX0135755 for the MONTGOMERY COUNTY MUD 145 WWTP in Conroe, TX, held by MONTGOMERY COUNTY MUD NO 145, which discharges to the UNNAMED TRIB; E FORK CRYSTAL CRK; CRYSTAL CRK receiving water in the Crystal Creek (HUC 120401010403) subwatershed. The page lists a permit status of Administratively continued, a Minor discharger class of 8, 3 pollutants under a numeric limit, and 3 pollutants with an effluent exceedance.