Clean Water Act discharge permit · NPDES IN0040177

KNIGHTSTOWN WWTP, Knightstown, IN: NPDES IN0040177 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
5Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

KNIGHTSTOWN WWTP holds NPDES permit IN0040177, which discharges to Big Blue River To Driftwood River. EPA’s file records it issued April 2, 2018 and expiring June 30, 2023.

KNIGHTSTOWN WWTP, Knightstown, Indiana: Individual permit IN0040177; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 2, 2018, term to June 30, 2023, by IDEM; discharges to BIG BLUE RIVER TO DRIFTWOOD RIVER.

Solids, total suspended: 4 limits, 49 violations of any kind, 13 effluent exceedances, latest March 31, 2026, largest 1,038% over the limit.
E. coli, colony forming units [CFU]: 3 limits, 31 violations of any kind, 13 effluent exceedances, latest April 30, 2021, largest 26,794% over the limit.
Solids, suspended percent removal: 0 limits, 11 violations of any kind, 3 effluent exceedances, latest April 30, 2018, largest 209% over the limit.
Nitrogen, ammonia total [as N]: 4 limits, 21 violations of any kind, 1 effluent exceedance, latest February 28, 2019, largest 10% over the limit.
pH: 2 limits, 20 violations of any kind, 1 effluent exceedance, latest January 31, 2006.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 36 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 1 limit, 17 violations of any kind, 0 effluent exceedances.
Oil & Grease: 0 limits, 8 violations of any kind, 0 effluent exceedances.
BOD, carb-5 day, 20 deg C, percent removal: 0 limits, 8 violations of any kind, 0 effluent exceedances.
Flow, total: 1 limit, 6 violations of any kind, 0 effluent exceedances.
Number of Events: 2 limits, 3 violations of any kind, 0 effluent exceedances.
Flow, wastewater by-passing trtmnt plant: 0 limits, 3 violations of any kind, 0 effluent exceedances.

June 8, 2026: Management Practice Violations - Inflow/Infiltration (I/I) (ST6).
June 8, 2026: Management Practice Violations - Best Management Practice Deficiencies (ST6).
June 8, 2026: Management Practice Violations - Improper Operation and Maintenance (ST6).
June 8, 2026: Management Practice Violations - Failure to Maintain Records (ST6).
June 8, 2026: Monitoring Violations - Invalid/Unrepresentative Sample (ST6).
June 8, 2026: Evaluation (S).
June 8, 2026: Notice of Noncompliance Issued (State).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 165 were issued before IN0040177.

Coverages issued nearest IN0040177

March 23, 2018: BUNKER HILL WWTP, TOWN OF, Bunker Hill, IN0020206, held by BUNKER HILL WWTP
March 23, 2018: BAINBRIDGE MUNICIPAL WWTP, Bainbridge, IN0040941
April 2, 2018: PLAINFIELD NORTH WATER POLLUTION CONTROL FACILITY, Plainfield, IN0021202, held by PLAINFIELD WATER POLLUTION CONTROL
April 2, 2018: COVINGTON WWTP, Covington, IN0025828, held by COVINGTON WASTEWATER TREATMENT PLANT
April 2, 2018: PAYNETOWN SRA WWTP, Bloomington, IN0030163, held by PAYNETOWN STATE RECREATION AREA
April 2, 2018: LYNNVILLE WWTP, Lynnville, IN0040282, held by LYNNVILLE WWTP
April 10, 2018: MULBERRY WWTP, Mulberry, IN0031976
April 30, 2018: PORTLAND WWTP, Portland, IN0020095
April 30, 2018: MIDDLETOWN WWTP, Middletown, IN0020770
April 30, 2018: CORYDON WWTP, Corydon, IN0020893

KNIGHTSTOWN WWTP among its neighbors

EPA’s permit file holds 5 discharge permits in the Goose Creek-Big Blue River subwatershed (HUC 051202040108), IN0040177 among them. Its county holds 32, 2 of them major permits; IN0040177 is a minor permit.

Other permits in the Goose Creek-Big Blue River subwatershed (HUC 051202040108)

CARTHAGE WWTP, Carthage: IN0024937, minor permit, discharging to BIG BLUE R TO DRIFTWOOD RIVER, permit term to July 31, 2024
IN DOT DES 2002071 BRIDGE REPLACEMENT ON SR 140 OVER BIG BLUE RIVER, Carthage: INRA15260, minor permit, permit term to January 12, 2030
INDIGREEN LLC, Carthage: IN0001350, minor permit, discharging to BIG BLUE R TO DRIFTWOOD RIVER, permit term to December 31, 2013
KNIGHTSTOWN COMMUNITY HIGH SCHOOL BUILDING ADDITION, Knightstown: INRA17506, minor permit, permit term to January 28, 2031

Identity

Facility as filed	KNIGHTSTOWN WWTP
Permittee as filed	KNIGHTSTOWN WWTP
NPDES ID	IN0040177
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	April 2, 2018
Expiration date	June 30, 2023
Issuing agency	IDEM
Address	Knightstown, IN 46148
Receiving water	BIG BLUE RIVER TO DRIFTWOOD RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Goose Creek-Big Blue River (HUC 051202040108)

Effluent limits and exceedances

12Pollutants on file
8Under 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	4	49	13	March 31, 2026	1,038% over the limit
E. coli, colony forming units [CFU]	3	31	13	April 30, 2021	26,794% over the limit
Solids, suspended percent removal	0	11	3	April 30, 2018	209% over the limit
Nitrogen, ammonia total [as N]	4	21	1	February 28, 2019	10% over the limit
pH	2	20	1	January 31, 2006
BOD, carbonaceous [5 day, 20 C]	4	36	0
Flow, in conduit or thru treatment plant	1	17	0
Oil & Grease	0	8	0
BOD, carb-5 day, 20 deg C, percent removal	0	8	0
Flow, total	1	6	0
Number of Events	2	3	0
Flow, wastewater by-passing trtmnt plant	0	3	0

Inspections, violations and enforcement

5Single-event violations

Date	What EPA recorded	Agency
June 8, 2026	Management Practice Violations - Inflow/Infiltration (I/I)	ST6
June 8, 2026	Management Practice Violations - Best Management Practice Deficiencies	ST6
June 8, 2026	Management Practice Violations - Improper Operation and Maintenance	ST6
June 8, 2026	Management Practice Violations - Failure to Maintain Records	ST6
June 8, 2026	Monitoring Violations - Invalid/Unrepresentative Sample	ST6

Inspections

Date	What EPA recorded	Agency
June 8, 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

Date	What EPA recorded	Agency
June 8, 2026	Notice of Noncompliance Issued	State

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

This public-records page covers Clean Water Act discharge permit NPDES IN0040177 for KNIGHTSTOWN WWTP in Knightstown, IN, which discharges to BIG BLUE RIVER TO DRIFTWOOD RIVER within the Goose Creek-Big Blue River subwatershed (HUC 051202040108). The permit is listed as administratively continued, with 8 pollutants under a numeric limit, 5 pollutants with an effluent exceedance, and 12 pollutants on file.