Clean Water Act discharge permit · NPDES TX0026433

GREEN RIDGE WWTP, Houston, TX: NPDES TX0026433 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
20Pollutants under a numeric limit
5Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

GREEN RIDGE WWTP, held by HOUSTON, CITY OF, holds NPDES permit TX0026433, which discharges to Houston Ship Channel (Buffalo Bayou Tidal). EPA’s file records it issued September 8, 2022 and expiring September 8, 2025. 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	GREEN RIDGE WWTP
Permittee as filed	HOUSTON, CITY OF
NPDES ID	TX0026433
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	September 8, 2022
Expiration date	September 8, 2025
Address	Houston, TX 77489
Receiving water	Houston Ship Channel (Buffalo Bayou Tidal)
Subwatershed	Upper Sims Bayou (HUC 120401040501)

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

Effluent limits and exceedances

28Pollutants on file
20Under a numeric limit
16With a violation of any kind
5With 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]	6	35	32	September 30, 2025	150% over the limit
E. coli	2	31	31	June 30, 2025	99,999% over the limit
Solids, total suspended	3	27	24	March 31, 2025	515% over the limit
BOD, carbonaceous [5 day, 20 C]	3	8	5	June 30, 2020	20% over the limit
Flow, in conduit or thru treatment plant	4	12	3	August 31, 2017	20% over the limit
pH	2	14	0
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia	0	4	0
Oxygen, dissolved [DO]	1	3	0
Chlorine, total residual	2	2	0
Annual amt of sludge incinerated	0	1	0
Annual amt sludge transported interstate	0	1	0
Whole effluent toxicity - retest #1	5	0	0
Whole effluent toxicity - retest #2	5	0	0
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	0	0
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	0	0
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	0	0
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas	4	0	0
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	0	0
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	0	0
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	0	0
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia	2	0	0
LC50 Pass/Fail Static 24Hr Acute D. Pulex	1	0	0
LC50 Pass/Fail Static 24Hr Acute Pimephales promelas	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

25Single-event violations

Date	What EPA recorded	Agency
March 6, 2026	Permit Violations - Violation Specified in Comment	ST6
July 15, 2024	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
December 8, 2023	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 7, 2023	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
May 17, 2023	Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
May 15, 2023	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 9, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 27, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
September 10, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
March 25, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
February 8, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 2, 2021	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 21, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
June 5, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
May 18, 2021	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
April 12, 2021	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
December 17, 2020	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 5, 2020	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
September 24, 2020	WW SSO - Discharge to Waters	EP6
January 12, 2020	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
December 5, 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
May 11, 2019	WW SSO - Discharge to Waters	EP6
December 12, 2018	Permit Violations - Violation Specified in Comment	ST6
June 4, 2018	WW SSO - Discharge to Waters	EP6

Inspections

Date	What EPA recorded	Agency
March 6, 2026	Evaluation	S

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 TX0026433.

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 TX0026433 there.

GREEN RIDGE WWTP, Houston, Texas: Individual permit TX0026433, held by HOUSTON, CITY OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 8, 2022, term to September 8, 2025; discharges to Houston Ship Channel (Buffalo Bayou Tidal).

Nitrogen, ammonia total [as N]: 6 limits, 35 violations of any kind, 32 effluent exceedances, latest September 30, 2025, largest 150% over the limit.
E. coli: 2 limits, 31 violations of any kind, 31 effluent exceedances, latest June 30, 2025, largest 99,999% over the limit.
Solids, total suspended: 3 limits, 27 violations of any kind, 24 effluent exceedances, latest March 31, 2025, largest 515% over the limit.
BOD, carbonaceous [5 day, 20 C]: 3 limits, 8 violations of any kind, 5 effluent exceedances, latest June 30, 2020, largest 20% over the limit.
Flow, in conduit or thru treatment plant: 4 limits, 12 violations of any kind, 3 effluent exceedances, latest August 31, 2017, largest 20% over the limit.
pH: 2 limits, 14 violations of any kind, 0 effluent exceedances.
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Annual amt of sludge incinerated: 0 limits, 1 violation of any kind, 0 effluent exceedances.
Annual amt sludge transported interstate: 0 limits, 1 violation of any kind, 0 effluent exceedances.
Whole effluent toxicity - retest #1: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Whole effluent toxicity - retest #2: 5 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 4 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
LC50 Pass/Fail Static 24Hr Acute D. Pulex: 1 limit, 0 violations of any kind, 0 effluent exceedances.
LC50 Pass/Fail Static 24Hr Acute Pimephales promelas: 1 limit, 0 violations of any kind, 0 effluent exceedances.

March 6, 2026: Permit Violations - Violation Specified in Comment (ST6).
March 6, 2026: Evaluation (S).
July 15, 2024: Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
December 8, 2023: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
October 7, 2023: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
May 17, 2023: Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
May 15, 2023: Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
November 9, 2022: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
October 27, 2022: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
September 10, 2022: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
March 25, 2022: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
February 8, 2022: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
November 2, 2021: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
October 21, 2021: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
June 5, 2021: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
May 18, 2021: Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
April 12, 2021: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
December 17, 2020: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
October 5, 2020: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
September 24, 2020: WW SSO - Discharge to Waters (EP6).
January 12, 2020: Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
December 5, 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).
May 11, 2019: WW SSO - Discharge to Waters (EP6).
December 12, 2018: Permit Violations - Violation Specified in Comment (ST6).
June 4, 2018: WW SSO - Discharge to Waters (EP6).

Texas holds 1,720 Publicly owned treatment works coverages of this permit type in EPA’s file; 1,608 were issued before TX0026433. HOUSTON, CITY OF holds 26 permits in Texas.

Other permits held by HOUSTON, CITY OF

PARK TEN MUD, Houston: TX0026395, issued September 28, 2017
WESTWAY WWTP, Houston: TX0026875, issued September 26, 2019
HARRIS COUNTY WCID 111 WWTP, Houston: TX0027201, issued September 11, 2018
ALMEDA SIMS WWTP, Houston: TX0034924, issued October 17, 2018
SOUTHEAST WWTP, Houston: TX0035009, issued May 26, 2020
TURKEY CREEK WWTP, Houston: TX0035017, issued December 29, 2020
CLINTON PARK WWTP, Houston: TX0035106, issued December 20, 2017
NORTHGATE WWTP, Houston: TX0055310, issued May 25, 2018
WHITE OAK WWTP, Houston: TX0057347, issued November 15, 2017
NORTHWEST WWTP, Houston: TX0063011, issued June 14, 2021

Coverages issued nearest TX0026433

July 15, 2022: MABANK WWTP, Mabank, TX0052949, held by MABANK, CITY OF
July 29, 2022: HARRIS COUNTY MUD 500 HORSEPEN CREEK WWTP, Cypress, TX0129071, held by HARRIS COUNTY MUD 500
August 2, 2022: STONEBROOKE SECTIONS 1 AND 2, Conroe, TX0142000, held by MONTGOMERY COUNTY MUD 212
August 15, 2022: CITY OF ALVORD WWTP, Alvord, TX0142204, held by ALVORD, CITY OF
September 1, 2022: JACKRABBIT ROAD PUD WWTP, Houston, TX0046621, held by JACKRABBIT ROAD PUBLIC UTILITY DISTRICT
September 9, 2022: HARRIS COUNTY MUD 558 WWTF, Tomball, TX0141577, held by HARRIS COUNTY MUD 558
October 6, 2022: HARRIS COUNTY MUD 167 WWTP, Katy, TX0094307, held by HARRIS COUNTY MUD 167
October 11, 2022: CITY OF PENELOPE WWTP, Penelope, TX0142247, held by PENELOPE, CITY OF
October 13, 2022: LEGACY HILLS WRF, Celina, TX0142018, held by CELINA, CITY OF
October 19, 2022: CITY OF SAN ANGELO WWTF, San Angelo, TX0141534, held by SAN ANGELO, CITY OF

GREEN RIDGE WWTP among its neighbors

EPA’s permit file holds 144 discharge permits in the Upper Sims Bayou subwatershed (HUC 120401040501), TX0026433 among them. Its county holds 4,455, 195 of them major permits; TX0026433 is a major permit.

Other permits in the Upper Sims Bayou subwatershed (HUC 120401040501)

13001 ALAMEDA HOUSTON PLANT, Houston: TX0079561, minor permit, discharging to SIMS BAYOU ABOVE TIDAL, permit term to January 8, 2024
7900 W FUQUA ST, Missouri City: TXR1594QZ, minor permit, discharging to SIMS BAYOU, permit term to March 4, 2028
ABLE INDUSTRIAL, Houston: TXR1537AO, minor permit, discharging to CLEAR CREEK, permit term to March 4, 2023
AIA HOUSTON P2 NEW MIDDLE SCHOOL, Houston: TXR1544NK, minor permit, discharging to SIMS BAYOU ABOVE TIDAL, permit term to March 4, 2028
AKADIA EVENT CENTER, Missouri City: TXR1502UE, minor permit, discharging to SIMS BAYOU ABOVE TIDAL, permit term to March 4, 2028
ALICANTE, Houston: TXR1581XY, minor permit, discharging to SIMS BAYOU 1007D, permit term to March 4, 2028
ALICANTE, Houston: TXR1594QW, minor permit, discharging to SIMS BAYOU ABOVE TIDAL, permit term to March 4, 2028
ALMEDA REED ROAD PIPE YARD DEVELOPMENT, Houston: TXR1542YM, minor permit, discharging to UNNAMED NON-TIDAL TRIBUTARY OF SIMS BAYOU, permit term to March 4, 2028
ALMEDA SIMS WWTP, Houston: TX0034924, major permit, discharging to SIMS BAY, permit term to October 17, 2023
ALMEDA SIMS WWTP, Houston: TXR05FF80, minor permit, permit term to August 13, 2026

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 TX0026433 for GREEN RIDGE WWTP in Houston, TX, held by HOUSTON, CITY OF, which discharges to Houston Ship Channel (Buffalo Bayou Tidal) in the Upper Sims Bayou subwatershed (HUC 120401040501). The permit is listed as administratively continued and a Major Discharger, with 20 pollutants under a numeric limit and 5 pollutants with an effluent exceedance.