Clean Water Act discharge permit · NPDES OK0030236

CITY OF SENECA, West Seneca, OK: NPDES OK0030236 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
7Pollutants under a numeric limit
7Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

CITY OF SENECA, held by Seneca, City of (Missouri), holds NPDES permit OK0030236, which discharges to 121600030560 Lost Ck/Neosho-Grand R.. EPA’s file records it issued January 15, 2019 and expiring January 31, 2024.

CITY OF SENECA, West Seneca, Oklahoma: Individual permit OK0030236, held by Seneca, City of (Missouri); Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued January 15, 2019, term to January 31, 2024, by ODEQ; discharges to 121600030560 Lost Ck/Neosho-Grand R.; Sewage Treatment Facilities.

Nitrogen, ammonia total [as N]: 3 limits, 111 violations of any kind, 93 effluent exceedances, latest March 31, 2016, largest 1,030% over the limit.
BOD, carbonaceous [5 day, 20 C]: 6 limits, 64 violations of any kind, 39 effluent exceedances, latest June 30, 2025, largest 296% over the limit.
Solids, total suspended: 3 limits, 37 violations of any kind, 16 effluent exceedances, latest June 30, 2025, largest 1,024% over the limit.
BOD, 5-day, 20 deg. C: 0 limits, 13 violations of any kind, 13 effluent exceedances, latest May 31, 2008, largest 141% over the limit.
E. coli: 2 limits, 11 violations of any kind, 11 effluent exceedances, latest July 31, 2026, largest 702% over the limit.
Coliform, fecal general: 0 limits, 15 violations of any kind, 5 effluent exceedances, latest February 29, 2016, largest 1,400% over the limit.
Coliform, total general: 0 limits, 4 violations of any kind, 2 effluent exceedances, latest February 29, 2008, largest 138% over the limit.
Flow, in conduit or thru treatment plant: 2 limits, 14 violations of any kind, 0 effluent exceedances.
pH: 2 limits, 13 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 2 limits, 7 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 0 limits, 4 violations of any kind, 0 effluent exceedances.

February 10, 2026: Evaluation (S).
November 1, 2018: Management Practice Violations - Laboratory Not Certified (ST6).

Oklahoma holds 197 Publicly owned treatment works coverages of this permit type in EPA’s file; 127 were issued before OK0030236.

Coverages issued nearest OK0030236

December 6, 2018: PAWHUSKA, CITY OF, Pawhuska, OK0028274, held by Pawhuska, City of
December 7, 2018: BARNSDALL, CITY OF, Barnsdall, OK0027308, held by Barnsdall, City of
December 7, 2018: KAW CITY WWTF, Kaw City, OK0028878, held by Kaw City, Town of
December 10, 2018: PURCELL, CITY OF, Purcell, OK0028533, held by Purcell, City of
January 15, 2019: HARTSHORNE, CITY OF, Hartshorne, OK0022861, held by Hartshorne, City of
January 17, 2019: MANNFORD PWA - EAST PLANT, Mannford, OK0024449, held by Mannford PWA-East
March 3, 2019: VIAN PWA, Vian, OK0021512, held by Vian PWA
April 9, 2019: MCLOUD PWA, Mcloud, OK0029009, held by McLoud PWA
May 6, 2019: WATONGA, CITY OF, Watonga, OK0021911, held by Watonga, City of
May 8, 2019: WEBBERS FALLS, CITY OF, Webbers Falls, OK0034631, held by Webbers Falls, City of

CITY OF SENECA among its neighbors

EPA’s permit file holds 13 discharge permits in the Lower Lost Creek subwatershed (HUC 110702060202), OK0030236 among them. Its county holds 13, 1 of them major permits; OK0030236 is a minor permit.

Other permits in the Lower Lost Creek subwatershed (HUC 110702060202)

2022 HERITAGE ACRES ADDITION, Wyandotte: OKR10I01V, minor permit, permit term to February 16, 2027
AMERICAN TRIPOLI, Seneca: MOG490262, minor permit, discharging to Tributary to Lost Creek, permit term to April 30, 2022
EASTERN SHAWNEE TRIBE OF OKLAHOMA CASINO/HOTEL/RV PARK, Ottawa: OK0044792, not classed, discharging to LOST CREEK
ESTOOO WATER, Seneca: MORA20917, minor permit, discharging to Tributary to Lost Creek, permit term to February 7, 2027
FAMILY SERVICES, Wyandotte: OKR10I03A, minor permit, permit term to February 16, 2027
OTTAWA CO RWD #1, Wyandotte: OK0028291, minor permit, discharging to 120600030040_00 trib/ Grand Lake O' the Cherokees, permit term to March 31, 2026
POLICE & COURTS, Wyandotte: OKR10I04A, minor permit, permit term to February 16, 2027
SANG BAWI, Seneca: MORA28894, minor permit, permit term to February 7, 2027
SENECA WWTP LAND APPLICATION, Seneca: MO0137634, minor permit, discharging to Tributary to Warren Br., permit term to December 31, 2028
TITLE VI BUILDING, Wyandotte: OKR10I029, minor permit, permit term to February 16, 2027

Identity

Facility as filed	CITY OF SENECA
Permittee as filed	Seneca, City of (Missouri)
NPDES ID	OK0030236
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	January 15, 2019
Expiration date	January 31, 2024
Issuing agency	ODEQ
Address	West Seneca, OK 74370
Receiving water	121600030560 Lost Ck/Neosho-Grand R.
Subwatershed	Lower Lost Creek (HUC 110702060202)
Program components on file	POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

11Pollutants on file
7Under a numeric limit
11With a violation of any kind
7With 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	111	93	March 31, 2016	1,030% over the limit
BOD, carbonaceous [5 day, 20 C]	6	64	39	June 30, 2025	296% over the limit
Solids, total suspended	3	37	16	June 30, 2025	1,024% over the limit
BOD, 5-day, 20 deg. C	0	13	13	May 31, 2008	141% over the limit
E. coli	2	11	11	July 31, 2026	702% over the limit
Coliform, fecal general	0	15	5	February 29, 2016	1,400% over the limit
Coliform, total general	0	4	2	February 29, 2008	138% over the limit
Flow, in conduit or thru treatment plant	2	14	0
pH	2	13	0
Oxygen, dissolved [DO]	2	7	0
Chlorine, total residual	0	4	0

Inspections, violations and enforcement

1Single-event violations

Date	What EPA recorded	Agency
November 1, 2018	Management Practice Violations - Laboratory Not Certified	ST6

Inspections

Date	What EPA recorded	Agency
February 10, 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 OK0030236.

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

This public-records page covers Clean Water Act discharge permit NPDES OK0030236 for CITY OF SENECA in West Seneca, OK, a publicly owned treatment works classed as a minor discharger, which is administratively continued past its January 31, 2024 expiration date. The page lists 7 pollutants under a numeric limit and 7 pollutants with an effluent exceedance.