Clean Water Act discharge permit · NPDES IN0020001

RIDGEVILLE WWTP, Ridgeville, IN: NPDES IN0020001 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
14Pollutants under a numeric limit
7Pollutants with an effluent exceedance
2Inspections on file
0Formal enforcement actions

RIDGEVILLE WWTP holds NPDES permit IN0020001, which discharges to Mississinewa River. EPA’s file records it issued February 14, 2019 and expiring February 29, 2024.

RIDGEVILLE WWTP, Ridgeville, Indiana: Individual permit IN0020001; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued February 14, 2019, term to February 29, 2024, by IDEM; discharges to MISSISSINEWA RIVER.

Chlorine, total residual: 6 limits, 105 violations of any kind, 77 effluent exceedances, latest July 31, 2024, largest 3,567% over the limit.
Nitrogen, ammonia total [as N]: 8 limits, 66 violations of any kind, 22 effluent exceedances, latest July 31, 2023, largest 630% over the limit.
E. coli, colony forming units [CFU]: 5 limits, 36 violations of any kind, 22 effluent exceedances, latest May 31, 2026, largest 1,836% over the limit.
Phosphorus, total [as P]: 4 limits, 18 violations of any kind, 12 effluent exceedances, latest October 31, 2023, largest 570% over the limit.
Solids, total suspended: 6 limits, 55 violations of any kind, 3 effluent exceedances, latest February 28, 2009, largest 139% over the limit.
BOD, carbonaceous [5 day, 20 C]: 6 limits, 56 violations of any kind, 2 effluent exceedances, latest November 30, 2022, largest 99,999% over the limit.
pH: 4 limits, 29 violations of any kind, 1 effluent exceedance, latest June 30, 2023.
Flow, in conduit or thru treatment plant: 3 limits, 25 violations of any kind, 0 effluent exceedances.
Precipitation, monthly accumulation: 2 limits, 9 violations of any kind, 0 effluent exceedances.
Flow, total: 2 limits, 9 violations of any kind, 0 effluent exceedances.
Number of Events: 2 limits, 8 violations of any kind, 0 effluent exceedances.
Duration: 2 limits, 7 violations of any kind, 0 effluent exceedances.
Overflow volume [SS0 volume, CSO volume]: 2 limits, 7 violations of any kind, 0 effluent exceedances.
Discharge event observation [Visual Monitoring]: 2 limits, 7 violations of any kind, 0 effluent exceedances.
Flow, wastewater by-passing trtmnt plant: 0 limits, 5 violations of any kind, 0 effluent exceedances.

May 12, 2026: Evaluation (S).
May 12, 2026: Evaluation (S).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 268 were issued before IN0020001.

Coverages issued nearest IN0020001

January 30, 2019: LYONS MUNICIPAL WWTP, Lyons, IN0023639, held by LYONS WASTEWATER TREATMENT PLANT
January 30, 2019: THRALLS STATION REGIONAL SEWER DISTRICT, Vigo County, IN0109592, held by THRALLS STATION RSD (ST. MARY OF THE WOODS WWTP)
January 31, 2019: SANTA CLAUS WASTEWATER TREATMENT PLANT, Santa Claus, IN0020605, held by SANTA CLAUS WWTP, TOWN OF
February 5, 2019: LINTON WWTP, West Linton, IN0020575, held by LINTON WWTP, CITY OF
February 5, 2019: DUPONT WWTP, Dupont, IN0022802
February 14, 2019: FARMERSBURG WASTEWATER TREATMENT PLANT, Farmersburg, IN0021148
February 14, 2019: TIPTON WWTP, Tipton, IN0021474
February 14, 2019: CENTERVILLE WWTP, Centerville, IN0022535
February 14, 2019: LOOGOOTEE WASTEWATER TREATMENT PLANT, Loogootee, IN0039241
February 14, 2019: LAGRANGE CO REG. UTILITY DIST - REGION A, Lagrange, IN0062014

RIDGEVILLE WWTP among its neighbors

EPA’s permit file holds 3 discharge permits in the Fetid Creek-Mississinewa River subwatershed (HUC 051201030203), IN0020001 among them. Its county holds 27, 2 of them major permits; IN0020001 is a minor permit.

Other permits in the Fetid Creek-Mississinewa River subwatershed (HUC 051201030203)

US AGGREGATES INCORPORATED RIDGEVILLE BERM CONSTRUCTION, Ridgeville: INRA08474, minor permit, permit term to October 3, 2026
US AGGREGATES INCORPORATED RIDGEVILLE QUARRY, Ridgeville: ING490050, minor permit, discharging to Mississinewa River, permit term to September 30, 2025

Identity

Facility as filed	RIDGEVILLE WWTP
Permittee as filed	RIDGEVILLE WWTP
NPDES ID	IN0020001
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 14, 2019
Expiration date	February 29, 2024
Issuing agency	IDEM
Address	Ridgeville, IN 47380
Receiving water	MISSISSINEWA RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Fetid Creek-Mississinewa River (HUC 051201030203)
Program components on file	CSO, POTW
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

15Pollutants on file
14Under a numeric limit
15With 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
Chlorine, total residual	6	105	77	July 31, 2024	3,567% over the limit
Nitrogen, ammonia total [as N]	8	66	22	July 31, 2023	630% over the limit
E. coli, colony forming units [CFU]	5	36	22	May 31, 2026	1,836% over the limit
Phosphorus, total [as P]	4	18	12	October 31, 2023	570% over the limit
Solids, total suspended	6	55	3	February 28, 2009	139% over the limit
BOD, carbonaceous [5 day, 20 C]	6	56	2	November 30, 2022	99,999% over the limit
pH	4	29	1	June 30, 2023
Flow, in conduit or thru treatment plant	3	25	0
Precipitation, monthly accumulation	2	9	0
Flow, total	2	9	0
Number of Events	2	8	0
Duration	2	7	0
Overflow volume [SS0 volume, CSO volume]	2	7	0
Discharge event observation [Visual Monitoring]	2	7	0
Flow, wastewater by-passing trtmnt plant	0	5	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IN0020001.

Inspections

Date	What EPA recorded	Agency
May 12, 2026	Evaluation	S
May 12, 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 IN0020001.

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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 IN0020001 held by RIDGEVILLE WWTP in Ridgeville, IN, which discharges to the Mississinewa River, a 303(D) listed impaired water. The page lists 14 as the discharger class, 7 pollutants under a numeric limit, and 7 pollutants with an effluent exceedance, with the permit status shown as administratively continued.