Clean Water Act discharge permit · NPDES TX0132063

WALLER COUNTY MUD 9A WWTP, Katy, TX: NPDES TX0132063 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
3Pollutants with an effluent exceedance

WALLER COUNTY MUD 9A WWTP, held by WALLER COUNTY MUD 9A, holds NPDES permit TX0132063, which discharges to Ditch;Cane Island Branch;Unclass Portion Buffalo B. EPA’s file records it issued May 2, 2017 and expiring May 1, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	WALLER COUNTY MUD 9A WWTP
Permittee as filed	WALLER COUNTY MUD 9A
NPDES ID	TX0132063
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	May 2, 2017
Expiration date	May 1, 2022
Address	Katy, TX 77493
Receiving water	DITCH;CANE ISLAND BRANCH;UNCLASS PORTION BUFFALO B
Subwatershed	Cane Island Branch (HUC 120401040102)
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

8Pollutants on file
8Under 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
Nitrogen, ammonia total [as N]	3	20	20	July 31, 2026	1,822% over the limit
Flow, in conduit or thru treatment plant	2	15	15	July 31, 2026	84% over the limit
E. coli	2	1	1	September 30, 2022	1,110% over the limit
Solids, total suspended	3	0	0
BOD, carbonaceous [5 day, 20 C]	3	0	0
pH	2	0	0
Chlorine, total residual	2	0	0
Oxygen, dissolved [DO]	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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES TX0132063.

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

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, TX0132063.

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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 TX0132063 there.

Nearby on the register

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

This public-records page covers the NPDES discharge permit TX0132063 held by WALLER COUNTY MUD 9A for the WALLER COUNTY MUD 9A WWTP in Katy, TX, which discharges to DITCH;CANE ISLAND BRANCH;UNCLASS PORTION BUFFALO B. The permit is listed as administratively continued with a Minor discharger class, and the facts show 8 items under the permit's classification and 3 pollutants under a numeric limit, with 3 pollutants having an effluent exceedance.