Clean Water Act discharge permit · NPDES MO0099856

OSBORN WWTF, Osborn, MO: NPDES MO0099856 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
11Pollutants under a numeric limit
5Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

OSBORN WWTF, held by City of Osborn, holds NPDES permit MO0099856, which discharges to Tributary To Grindstone Creek. EPA’s file records it issued February 24, 2017 and expiring December 31, 2021.

OSBORN WWTF, Osborn, Missouri: Individual permit MO0099856, held by City of Osborn; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued February 24, 2017, term to December 31, 2021; discharges to Tributary to Grindstone Creek.

Solids, total suspended: 2 limits, 114 violations of any kind, 62 effluent exceedances, latest April 30, 2026, largest 471% over the limit.
Solids, suspended percent removal: 1 limit, 32 violations of any kind, 16 effluent exceedances, latest May 31, 2026, largest 185% over the limit.
BOD, 5-day, 20 deg. C: 2 limits, 65 violations of any kind, 13 effluent exceedances, latest June 30, 2022, largest 468% over the limit.
BOD, 5-day, percent removal: 1 limit, 26 violations of any kind, 10 effluent exceedances, latest June 30, 2026, largest 158% over the limit.
Oil and grease [soxhlet extr.] tot.: 2 limits, 37 violations of any kind, 5 effluent exceedances, latest January 31, 2023, largest 93% over the limit.
pH: 1 limit, 48 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 38 violations of any kind, 0 effluent exceedances.
Nitrogen, ammonia total [as N]: 2 limits, 32 violations of any kind, 0 effluent exceedances.
E. coli: 2 limits, 18 violations of any kind, 0 effluent exceedances.
Temperature, water deg. centigrade: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Ceriodaphnia dubia: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 1 violation of any kind, 0 effluent exceedances.

May 21, 2026: Evaluation (S).
March 31, 2023: Reporting Violations - Improper/ Incorrect Reporting (ST6).
March 31, 2023: Permit Violations - Violation Specified in Comment (ST6).
March 31, 2023: Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) (ST6).
March 29, 2021: Effluent Violations - Numeric effluent violation (ST6).
September 26, 2018: Reporting Violations - Failure to Submit DMRs (ST6).
March 24, 2017: Reporting Violations - Failure to Submit DMRs (ST6).
March 24, 2017: Effluent Violations - Numeric effluent violation (ST6).

Missouri holds 756 Publicly owned treatment works coverages of this permit type in EPA’s file; 192 were issued before MO0099856.

Coverages issued nearest MO0099856

February 17, 2017: PLATTSBURG WWTP, Plattsburg, MO0030805, held by City of Plattsburg
February 21, 2017: HERCULANEUM WWTP, Herculaneum, MO0027111, held by City of Herculaneum
February 21, 2017: LAKE OF THE OZARKS REGIONAL WWTP 1, Lake Ozark, MO0103241, held by Lake Ozark and Osage Beach Joint Board
February 22, 2017: WARRENSBURG WEST WWTP, Warrensburg, MO0055905, held by City of Warrensburg
February 22, 2017: MARQUAND WWTP, Marquand, MO0116246, held by City of Marquand
February 27, 2017: JCPSD FAWN MEADOW WWTP, Hillsboro, MO0049280, held by Jefferson County Public Sewer District
March 2, 2017: THEODOSIA WWTP, Theodosia, MO0127604, held by Village of Theodosia
March 14, 2017: JCPSD LOCKEPORT LANDING WWTF, Hillsboro, MO0131199, held by Jefferson County Public Sewer District
March 16, 2017: PEVELY WWTP, Pevely, MO0040142, held by City of Pevely
March 22, 2017: WIRECO WORLDGROUP - SEDALIA, Sedalia, MO0098132, held by WireCo WorldGroup

OSBORN WWTF among its neighbors

EPA’s permit file holds 10 discharge permits in the Wheeler Creek-Grindstone Creek subwatershed (HUC 102801010701), MO0099856 among them. Its county holds 30, 1 of them major permits; MO0099856 is a minor permit.

Other permits in the Wheeler Creek-Grindstone Creek subwatershed (HUC 102801010701)

ALLSTATE AUTO SALVAGE AND SALES, Osborn: MOR60A435, minor permit, discharging to Tributary to Grindstone Cr., permit term to December 11, 2023
CAMERON MEMORIAL AIRPORT, Cameron: MORA28092, minor permit, discharging to Tributary to Grindstone Cr., permit term to February 7, 2027
CAMERON MUNICIPAL WTP, Cameron: MOG640016, minor permit, discharging to Tributary to Cameron Reservoir Number 2, permit term to February 24, 2029
CAMERON QUARRY, Cameron: MOG490002, minor permit, discharging to Tributary to Wheeler Cr., permit term to April 30, 2027
CAMERON SOUTH QUARRY, Osborn: MOG491644, minor permit, discharging to Tributary to Cameron Lake #4 (Grindstone Reservoir, permit term to April 30, 2027
CP NORTH FARM, Osborn: MORA29045, minor permit, discharging to Cameron Lake #4 (Grindstone Reservoir), permit term to February 7, 2027
DURHAM SCHOOL SERVICES, LP CSC 3060, Cameron: MONX00472, minor permit, permit term to May 13, 2026
ROBERT MATTSON, Cameron: MOG010052, minor permit, discharging to GRINDSTONE CR, permit term to February 23, 2011
SUR-GRO PLANT FOOD CO-OSBORN, Osborn: MOR240037, minor permit, discharging to Grindstone Cr., permit term to February 19, 2014

Identity

Facility as filed	OSBORN WWTF
Permittee as filed	City of Osborn
NPDES ID	MO0099856
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	February 24, 2017
Expiration date	December 31, 2021
Address	Osborn, MO 64474
Receiving water	Tributary to Grindstone Creek
Subwatershed	Wheeler Creek-Grindstone Creek (HUC 102801010701)
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

12Pollutants on file
11Under a numeric limit
12With 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
Solids, total suspended	2	114	62	April 30, 2026	471% over the limit
Solids, suspended percent removal	1	32	16	May 31, 2026	185% over the limit
BOD, 5-day, 20 deg. C	2	65	13	June 30, 2022	468% over the limit
BOD, 5-day, percent removal	1	26	10	June 30, 2026	158% over the limit
Oil and grease [soxhlet extr.] tot.	2	37	5	January 31, 2023	93% over the limit
pH	1	48	0
Flow, in conduit or thru treatment plant	2	38	0
Nitrogen, ammonia total [as N]	2	32	0
E. coli	2	18	0
Temperature, water deg. centigrade	0	4	0
Toxicity [acute], Ceriodaphnia dubia	1	1	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	1	0

Inspections, violations and enforcement

7Single-event violations

Date	What EPA recorded	Agency
March 31, 2023	Reporting Violations - Improper/ Incorrect Reporting	ST6
March 31, 2023	Permit Violations - Violation Specified in Comment	ST6
March 31, 2023	Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)	ST6
March 29, 2021	Effluent Violations - Numeric effluent violation	ST6
September 26, 2018	Reporting Violations - Failure to Submit DMRs	ST6
March 24, 2017	Reporting Violations - Failure to Submit DMRs	ST6
March 24, 2017	Effluent Violations - Numeric effluent violation	ST6

Inspections

Date	What EPA recorded	Agency
May 21, 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 MO0099856.

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

This public-records page covers the Clean Water Act discharge permit NPDES MO0099856 for the OSBORN WWTF in Osborn, MO, held by the City of Osborn and discharging to Tributary to Grindstone Creek, with its status and dates as EPA's permit file stood when the page was loaded. The page lists the permit as administratively continued and a minor discharger, with 5 pollutants under a numeric limit and 5 pollutants with an effluent exceedance.