Clean Water Act discharge permit · NPDES IN0035696

MOUNT VERNON WWTP, Mount Vernon, IN: NPDES IN0035696 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
27Pollutants under a numeric limit
11Pollutants with an effluent exceedance
3Inspections on file
0Formal enforcement actions

MOUNT VERNON WWTP, held by MOUNT VERNON MUNICIPAL WWTP, holds NPDES permit IN0035696, which discharges to Ohio River. EPA’s file records it issued August 27, 2020 and expiring December 31, 2025.

MOUNT VERNON WWTP, Mount Vernon, Indiana: Individual permit IN0035696, held by MOUNT VERNON MUNICIPAL WWTP; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 27, 2020, term to December 31, 2025, by IDEM; discharges to OHIO RIVER; Sewage Treatment Facilities.

Solids, total suspended: 4 limits, 36 violations of any kind, 15 effluent exceedances, latest February 28, 2025, largest 264% over the limit.
E. coli, colony forming units [CFU]: 3 limits, 14 violations of any kind, 10 effluent exceedances, latest April 30, 2025, largest 26,794% over the limit.
Solids, suspended percent removal: 0 limits, 9 violations of any kind, 6 effluent exceedances, latest March 31, 2015, largest 97% over the limit.
Nitrogen, ammonia total [as N]: 8 limits, 11 violations of any kind, 3 effluent exceedances, latest September 30, 2025, largest 95% over the limit.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 19 violations of any kind, 2 effluent exceedances, latest March 31, 2023, largest 107% over the limit.
pH: 2 limits, 8 violations of any kind, 2 effluent exceedances, latest August 31, 2001.
Chlorine, total residual: 0 limits, 8 violations of any kind, 2 effluent exceedances, latest October 31, 2004, largest 100% over the limit.
Coliform, fecal general: 1 limit, 4 violations of any kind, 1 effluent exceedance, latest November 30, 2003, largest 3,060% over the limit.
Molybdenum, sludge, total, dry weight [as Mo]: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2009, largest 20% over the limit.
E. coli, MTEC-MF: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest June 30, 2001, largest 99,999% over the limit.
TU Static Renewal 48Hr Acute Daphnia magna: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2015, largest 9,900% over the limit.
Duration: 2 limits, 13 violations of any kind, 0 effluent exceedances.
Overflow volume [SS0 volume, CSO volume]: 2 limits, 11 violations of any kind, 0 effluent exceedances.
Discharge event observation [Visual Monitoring]: 2 limits, 10 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 2 limits, 9 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 2 limits, 9 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 2 limits, 9 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 1 limit, 7 violations of any kind, 0 effluent exceedances.
Mercury, total recoverable: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Number of Events: 2 limits, 3 violations of any kind, 0 effluent exceedances.
Precipitation, monthly accumulation: 2 limits, 3 violations of any kind, 0 effluent exceedances.
BOD, carb-5 day, 20 deg C, percent removal: 0 limits, 3 violations of any kind, 0 effluent exceedances.
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia: 0 limits, 3 violations of any kind, 0 effluent exceedances.
LC50 Static Renewal 48Hr Acute Daphnia pulex: 0 limits, 3 violations of any kind, 0 effluent exceedances.
LC50 Static Renewal 96Hr Acute Pimephales promelas: 0 limits, 3 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 2 limits, 1 violation of any kind, 0 effluent exceedances.
Flow, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Toxicity [acute], Ceriodaphnia dubia: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Pimephales promelas [Fathead Minnow]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
TU Static 48Hr Acute Daphnia magna: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Copper, dry weight: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Cadmium, dry weight: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Zinc, sludge, total, dry weight [as Zn]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Lead, sludge, total, dry weight [as Pb]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Nickel, sludge, total, dry weight [as Ni]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Mercury, sludge, total, dry weight [as Hg]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

August 5, 2026: Plan Review (S).
March 23, 2026: Reporting Violations - Improper/ Incorrect Reporting (ST6).
March 23, 2026: Evaluation (S).
March 23, 2026: Evaluation (S).
March 23, 2026: Notice of Noncompliance Issued (State).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 447 were issued before IN0035696. MOUNT VERNON MUNICIPAL WWTP holds 2 permits in Indiana.

Other permits held by MOUNT VERNON MUNICIPAL WWTP

MOUNT VERNON MUNICIPAL WWTP, Mount Vernon: INL035696, issued January 1, 2021

Coverages issued nearest IN0035696

August 13, 2020: ST JOSEPH COUNTY RWSD - WYATT WWTP, Wyatt, IN0063258
August 27, 2020: RUSSIAVILLE WWTP, Russiaville, IN0020532, held by RUSSIAVILLE WWTP, TOWN OF
August 27, 2020: ROSSVILLE WWTP, Rossville, IN0020907, held by ROSSVILLE WWTP, TOWN OF
August 27, 2020: ANDERSON WWTP, Anderson, IN0032476
August 27, 2020: ELWOOD WWTP, CITY OF, Elwood, IN0032719
September 3, 2020: ELLETTSVILLE MUNICIPAL WWTP, Ellettsville, IN0021083
September 3, 2020: AKRON WWTP, Akron, IN0025232, held by AKRON MUNICIPAL WWTP
September 3, 2020: NEW PARIS CONSERVANCY DISTRICT, New Paris, IN0058025
September 3, 2020: ST LEON WWTP, West Harrison, IN0058408, held by ST. LEON WWTP
September 10, 2020: MODOC, TOWN OF, Modoc, IN0031135, held by MODOC WWTP

MOUNT VERNON WWTP among its neighbors

EPA’s permit file holds 15 discharge permits in the McFadden Creek subwatershed (HUC 051402020604), IN0035696 among them. Its county holds 55, 4 of them major permits; IN0035696 is a major permit.

Other permits in the McFadden Creek subwatershed (HUC 051402020604)

COUNTRYMARK REFINING AND LOGISTICS LLC, Mt. Vernon: INRA11049, minor permit, permit term to December 20, 2027
EVANSVILLE WESTERN RAILWAY INC 339.5 BRIDGE REPLACEMENT, Mt Vernon: INRA12479, minor permit, permit term to August 30, 2028
HARBORTOWN WWTP, Mount Vernon: IN0109924, minor permit, discharging to OR/MCFADDEN CREEK/UNNAMED TRIBUTARY, permit term to July 31, 2021
INFINITY MOLDING & ASSEMBLY, Mount Vernon: ING250072, minor permit, discharging to OHIO R VIA INDIAN CR VIA DITCH, permit term to October 31, 2007
MOUNT VERNON RAIL ACCESS, Mount Vernon: INRA17299, minor permit, permit term to December 10, 2030
MOUNT VERNON TRANSFER TERM LLC, Mount Vernon: IN0049760, minor permit, discharging to OHIO R VIA MCFADDEN CREEK, permit term to November 30, 2021
POSEY COUNTY RSD - HARBORTOWN WWTP, Mount Vernon: IN0064831, minor permit, discharging to MCFADDEN CREEK, permit term to January 31, 2025
POSEY SOLAR, Mt Vernon: INRA15520, minor permit, permit term to March 6, 2030
RECKITT SITE-EVANSVILLE UNITED LLC-POSEY CO, Mt. Vernon: INRA15945, minor permit, permit term to May 4, 2030
RUSSELL EXCAVATING DUMPSITE, Mount Vernon: INRA09321, minor permit, permit term to March 15, 2027

Identity

Facility as filed	MOUNT VERNON WWTP
Permittee as filed	MOUNT VERNON MUNICIPAL WWTP
NPDES ID	IN0035696
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	August 27, 2020
Expiration date	December 31, 2025
Issuing agency	IDEM
Address	Mount Vernon, IN 47620
Receiving water	OHIO RIVER
Subwatershed	McFadden Creek (HUC 051402020604)
Program components on file	Biosolids, CSO, POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

36Pollutants on file
27Under a numeric limit
27With a violation of any kind
11With 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	36	15	February 28, 2025	264% over the limit
E. coli, colony forming units [CFU]	3	14	10	April 30, 2025	26,794% over the limit
Solids, suspended percent removal	0	9	6	March 31, 2015	97% over the limit
Nitrogen, ammonia total [as N]	8	11	3	September 30, 2025	95% over the limit
BOD, carbonaceous [5 day, 20 C]	4	19	2	March 31, 2023	107% over the limit
pH	2	8	2	August 31, 2001
Chlorine, total residual	0	8	2	October 31, 2004	100% over the limit
Coliform, fecal general	1	4	1	November 30, 2003	3,060% over the limit
Molybdenum, sludge, total, dry weight [as Mo]	1	1	1	December 31, 2009	20% over the limit
E. coli, MTEC-MF	0	1	1	June 30, 2001	99,999% over the limit
TU Static Renewal 48Hr Acute Daphnia magna	0	1	1	December 31, 2015	9,900% over the limit
Duration	2	13	0
Overflow volume [SS0 volume, CSO volume]	2	11	0
Discharge event observation [Visual Monitoring]	2	10	0
Nitrogen, total [as N]	2	9	0
Nitrogen, Kjeldahl, total [as N]	2	9	0
Nitrite + Nitrate total [as N]	2	9	0
Flow, in conduit or thru treatment plant	1	7	0
Mercury, total recoverable	0	4	0
Number of Events	2	3	0
Precipitation, monthly accumulation	2	3	0
BOD, carb-5 day, 20 deg C, percent removal	0	3	0
LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	0	3	0
LC50 Static Renewal 48Hr Acute Daphnia pulex	0	3	0
LC50 Static Renewal 96Hr Acute Pimephales promelas	0	3	0
Phosphorus, total [as P]	2	1	0
Flow, total	1	1	0
Toxicity [acute], Ceriodaphnia dubia	3	0	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	3	0	0
TU Static 48Hr Acute Daphnia magna	3	0	0
Copper, dry weight	1	0	0
Cadmium, dry weight	1	0	0
Zinc, sludge, total, dry weight [as Zn]	1	0	0
Lead, sludge, total, dry weight [as Pb]	1	0	0
Nickel, sludge, total, dry weight [as Ni]	1	0	0
Mercury, sludge, total, dry weight [as Hg]	1	0	0

Inspections, violations and enforcement

1Single-event violations

Date	What EPA recorded	Agency
March 23, 2026	Reporting Violations - Improper/ Incorrect Reporting	ST6

Inspections

Date	What EPA recorded	Agency
August 5, 2026	Plan Review	S
March 23, 2026	Evaluation	S
March 23, 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
March 23, 2026	Notice of Noncompliance Issued	State

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This public-records page covers the Clean Water Act discharge permit NPDES IN0035696 for the MOUNT VERNON WWTP in Mount Vernon, IN, held by MOUNT VERNON MUNICIPAL WWTP and discharging to the OHIO RIVER, with a permit status of administratively continued. The page lists 27 as the discharger class figure, 11 pollutants under a numeric limit, and 11 pollutants with an effluent exceedance.