Clean Water Act discharge permit · NPDES TX0055310

NORTHGATE WWTP, Houston, TX: NPDES TX0055310 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
52Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

NORTHGATE WWTP, held by HOUSTON, CITY OF, holds NPDES permit TX0055310, which discharges to Greens Bayou Above Tidal. EPA’s file records it issued May 25, 2018 and expiring May 25, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	NORTHGATE WWTP
Permittee as filed	HOUSTON, CITY OF
NPDES ID	TX0055310
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	May 25, 2018
Expiration date	May 25, 2023
Address	Houston, TX 77060
Receiving water	GREENS BAYOU ABOVE TIDAL
Subwatershed	Upper Greens Bayou (HUC 120401040603)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

52Pollutants on file
52Under a numeric limit
31With a violation of any kind
4With 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	24	15	March 31, 2023	530% over the limit
Nitrogen, ammonia total [as N]	3	21	12	September 30, 2023	133% over the limit
E. coli	8	10	8	July 31, 2023	99,999% over the limit
BOD, carbonaceous [5 day, 20 C]	3	13	4	April 30, 2022	99,999% over the limit
Cyanide, free [amenable to chlorination]	3	13	0
Whole Effluent Toxicity [WET] - C. dubia	2	12	0
Flow, in conduit or thru treatment plant	4	7	0
pH	3	4	0
Chlorine, total residual	2	4	0
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	2	0
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	2	0
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	2	0
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	2	0
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	2	0
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	2	0
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	2	0
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	2	0
Oxygen, dissolved [DO]	1	2	0
Arsenic, dry weight	5	1	0
Chromium, sludge, total, dry weight [as Cr]	5	1	0
Selenium, dry weight	3	1	0
Copper, dry weight	3	1	0
Cadmium, dry weight	3	1	0
Molybdenum, sludge, total, dry weight [as Mo]	3	1	0
Zinc, sludge, total, dry weight [as Zn]	3	1	0
Lead, sludge, total, dry weight [as Pb]	3	1	0
Nickel, sludge, total, dry weight [as Ni]	3	1	0
Mercury, sludge, total, dry weight [as Hg]	3	1	0
Toxicity characteristic leaching procedure	1	1	0
LC50 Pass/Fail Static 24Hr Acute D. Pulex	1	1	0
LC50 Pass/Fail Static 24Hr Acute Pimephales promelas	1	1	0
Whole effluent toxicity - retest #1	5	0	0
Whole effluent toxicity - retest #2	5	0	0
Nickel, total [as Ni]	2	0	0
Level of pathogen requirements achieved	2	0	0
Description of pathogen option used	2	0	0
Vector attraction reduction alternative used	2	0	0
Fecal coliform	1	0	0
Polychlorinated biphenyls [PCBs]	1	0	0
Annual whole sludge application rate	1	0	0
Ann. amt sludge disposed by other method	1	0	0
Annual amt of sludge incinerated	1	0	0
Annual sludge production, total	1	0	0
Annual amount of sludge land applied	1	0	0
Annual amt. sludge disposed surface unit	1	0	0
Annual amt sludge disposed in landfill	1	0	0
Annual amt sludge transported interstate	1	0	0
Unit w/liner/leachate collection system	1	0	0
Compliance w/part 258 sludge requirement	1	0	0
Boundary areas	1	0	0
Salmonella	1	0	0
Pollutant table from 503.13	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

21Single-event violations

Date	What EPA recorded	Agency
May 16, 2024	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
October 23, 2023	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
October 18, 2023	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 9, 2023	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 10, 2023	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
June 15, 2023	Permit Violations - Violation Specified in Comment	ST6
November 7, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 3, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 8, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
February 8, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 29, 2021	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 22, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
December 29, 2020	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 12, 2020	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
September 16, 2020	WW SSO - Discharge to Waters	EP6
January 21, 2020	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 1, 2019	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
September 21, 2019	WW SSO - Overflow to Dry Land or Building Backup	EP6
March 5, 2019	Permit Violations - Violation Specified in Comment	ST6
December 13, 2017	WW SSO - Discharge to Waters	EP6
March 30, 2017	Permit Violations - Violation Specified in Comment	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES TX0055310.

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 TX0055310.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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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 TX0055310 there.

Nearby on the register

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

This public-records page covers NPDES permit TX0055310 for NORTHGATE WWTP in Houston, TX, held by HOUSTON, CITY OF, which discharges to GREENS BAYOU ABOVE TIDAL in the Upper Greens Bayou subwatershed (HUC 120401040603). The permit is listed as administratively continued, with 52 pollutants on file, 31 under a numeric limit, and 4 with an effluent exceedance.