Clean Water Act discharge permit · NPDES TX0047058

OSO WWTP, Corpus Christi, TX: NPDES TX0047058 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
55Pollutants under a numeric limit
5Pollutants with an effluent exceedance
2Inspections on file
1Formal enforcement actions

OSO WWTP, held by CORPUS CHRISTI, CITY OF, holds NPDES permit TX0047058, which discharges to 72 Pipe To A 40'Wide Tidal Channel. EPA’s file records it issued April 29, 2011 and expiring June 1, 2014. 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	OSO WWTP
Permittee as filed	CORPUS CHRISTI, CITY OF
NPDES ID	TX0047058
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	April 29, 2011
Expiration date	June 1, 2014
Address	Corpus Christi, TX 78412
Receiving water	72 PIPE TO A 40'WIDE TIDAL CHANNEL
Subwatershed	Oso Creek-Frontal Oso Bay (HUC 121102020106)
Program components on file	POTW, Pretreatment
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

55Pollutants on file
55Under a numeric limit
40With 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
Enterococci	2	25	23	August 31, 2023	2,619% over the limit
Solids, total suspended	3	22	13	May 31, 2021	416% over the limit
Nitrogen, ammonia total [as N]	6	16	7	June 30, 2026	200% over the limit
BOD, 5-day, 20 deg. C	3	11	2	September 30, 2010	20% over the limit
BOD, carbonaceous [5 day, 20 C]	3	1	1	February 28, 2021	344% over the limit
Flow, in conduit or thru treatment plant	4	12	0
pH	3	7	0
Chlorine, total residual	2	6	0
Arsenic, dry weight	5	5	0
Chromium, sludge, total, dry weight [as Cr]	5	5	0
Selenium, dry weight	3	3	0
Copper, dry weight	3	3	0
Cadmium, dry weight	3	3	0
Molybdenum, sludge, total, dry weight [as Mo]	3	3	0
Zinc, sludge, total, dry weight [as Zn]	3	3	0
Lead, sludge, total, dry weight [as Pb]	3	3	0
Nickel, sludge, total, dry weight [as Ni]	3	3	0
Mercury, sludge, total, dry weight [as Hg]	3	3	0
Oxygen, dissolved [DO]	1	3	0
Whole effluent toxicity - retest #2	3	2	0
Nickel, total [as Ni]	2	2	0
Level of pathogen requirements achieved	2	2	0
Description of pathogen option used	2	2	0
Vector attraction reduction alternative used	2	2	0
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	2	2	0
Polychlorinated biphenyls [PCBs]	1	2	0
Fecal coliform	1	1	0
Toxicity characteristic leaching procedure	1	1	0
Ann. amt sludge disposed by other method	1	1	0
Annual amt of sludge incinerated	1	1	0
Annual sludge production, total	1	1	0
Annual amount of sludge land applied	1	1	0
Annual amt. sludge disposed surface unit	1	1	0
Annual amt sludge disposed in landfill	1	1	0
Annual amt sludge transported interstate	1	1	0
Unit w/liner/leachate collection system	1	1	0
Compliance w/part 258 sludge requirement	1	1	0
Boundary areas	1	1	0
Salmonella	1	1	0
Pollutant table from 503.13	1	1	0
Whole effluent toxicity - retest #1	3	0	0
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	2	0	0
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia	2	0	0
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	2	0	0
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia	2	0	0
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	2	0	0
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	2	0	0
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	2	0	0
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	2	0	0
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	2	0	0
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia	2	0	0
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia	2	0	0
Annual whole sludge application rate	1	0	0
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	1	0	0
LC50 Pass/Fail Static 24Hr Acute Menidia menidia	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

26Single-event violations

Date	What EPA recorded	Agency
March 17, 2026	Permit Violations - Violation Specified in Comment	ST6
January 30, 2024	Permit Violations - Violation Specified in Comment	ST6
January 22, 2024	Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 13, 2023	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
August 22, 2023	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
April 23, 2023	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 1, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 20, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 25, 2022	Permit Violations - Violation Specified in Comment	ST6
July 12, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
May 3, 2022	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
April 5, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
January 13, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 27, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 3, 2021	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 1, 2021	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 26, 2021	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 6, 2021	Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 5, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
May 12, 2021	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 26, 2020	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
February 11, 2020	Effluent Violations - Reported Fish Kill	EP6
February 11, 2020	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
October 10, 2019	Dry-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment	EP6
October 8, 2019	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
October 26, 2018	WW SSO - Overflow to Dry Land or Building Backup	EP6

Inspections

Date	What EPA recorded	Agency
July 27, 2026	Evaluation	S
March 17, 2026	Evaluation	S

Formal enforcement and penalties

1 formal actions, 1 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.

Date	What EPA recorded	Agency	Federal penalty	State or local penalty
June 9, 2026	State CWA Penalty AO	State		$205,055

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES TX0047058.

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 TX0047058 there.

Nearby on the register

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

This public-records page covers NPDES permit TX0047058 for the OSO WWTP in Corpus Christi, TX, held by CORPUS CHRISTI, CITY OF, and lists its status as administratively continued with a Major Discharger class. The page reports 55 pollutants under a numeric limit and 5 pollutants with an effluent exceedance, with the permit shown as issued April 29, 2011 and expiring June 1, 2014. The discharge runs to 72 PIPE TO A 40'WIDE TIDAL CHANNEL within the Oso Creek-Frontal Oso Bay subwatershed (HUC 121102020106).