Clean Water Act discharge permit · NPDES IN0063525

DEARBORN COUNTY RSD HIGH RIDGE WWTP, Aurora, IN: NPDES IN0063525 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
6Pollutants with an effluent exceedance
1Inspections on file
0Formal enforcement actions

DEARBORN COUNTY RSD HIGH RIDGE WWTP, held by HIGH RIDGE WWTP, holds NPDES permit IN0063525, which discharges to Unnamed Trib To S Hogan Creek. EPA’s file records it issued March 7, 2019 and expiring November 30, 2024.

DEARBORN COUNTY RSD HIGH RIDGE WWTP, Aurora, Indiana: Individual permit IN0063525, held by HIGH RIDGE WWTP; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued March 7, 2019, term to November 30, 2024, by IDEM; discharges to UNNAMED TRIB TO S HOGAN CREEK.

Nitrogen, ammonia total [as N]: 8 limits, 114 violations of any kind, 109 effluent exceedances, latest July 31, 2026, largest 944% over the limit.
Solids, total suspended: 8 limits, 90 violations of any kind, 81 effluent exceedances, latest May 31, 2026, largest 2,398% over the limit.
E. coli, colony forming units [CFU]: 3 limits, 60 violations of any kind, 60 effluent exceedances, latest June 30, 2026, largest 27,219% over the limit.
Chlorine, total residual: 4 limits, 57 violations of any kind, 56 effluent exceedances, latest July 31, 2026, largest 9,900% over the limit.
Solids, suspended percent removal: 0 limits, 8 violations of any kind, 8 effluent exceedances, latest October 31, 2019, largest 209% over the limit.
BOD, carbonaceous [5 day, 20 C]: 8 limits, 11 violations of any kind, 7 effluent exceedances, latest February 28, 2026, largest 328% over the limit.
Oxygen, dissolved [DO]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
pH: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Flow, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Number of Events: 2 limits, 0 violations of any kind, 0 effluent exceedances.

April 6, 2026: Management Practice Violations - Best Management Practice Deficiencies (ST6).
April 6, 2026: Management Practice Violations - Inflow/Infiltration (I/I) (ST6).
April 6, 2026: Management Practice Violations - Improper Operation and Maintenance (ST6).
April 6, 2026: Effluent Violations - Numeric effluent violation (ST6).
April 6, 2026: Evaluation (S).
April 6, 2026: Notice of Noncompliance Issued (State).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 281 were issued before IN0063525.

Coverages issued nearest IN0063525

February 27, 2019: THORNTOWN WWTP, Thorntown, IN0024589
February 27, 2019: MUNCIE WATER POLLUTION CONTROL FACILITY, Muncie, IN0025631
February 27, 2019: CHAIN O'LAKES STATE PARK, Albion, IN0030333
February 27, 2019: KENNARD WWTP, Kennard, IN0040151
March 7, 2019: LAPAZ MUNICIPAL WWTP, La Paz, IN0040223
March 20, 2019: RUSHVILLE WWTP, Rushville, IN0021270
March 20, 2019: OLDENBURG WWTP, Oldenburg, IN0023973
March 29, 2019: BROOKSTON MUNICIPAL WWTP, Brookston, IN0020974
March 29, 2019: HOPE WWTP, Hope, IN0021253
April 18, 2019: SPENCER MUNICIPAL WWTP, Spencer, IN0020192

DEARBORN COUNTY RSD HIGH RIDGE WWTP among its neighbors

Its county holds 49, 2 of them major permits; IN0063525 is a minor permit.

Other permits in the county

AEP: TANNERS CREEK PLANT CLAY STOCKPILE STORAGE FACILITY & SEDIMENT BASIN, Lawrenceburg: INR10J367, minor permit, permit term to November 12, 2019
ALL-RITE READY MIX OF INDIANA LLC, Aurora: IN0059897, minor permit, discharging to LAUGHERY CR VIA UNAMED TRIBUTARY, permit term to January 31, 2013
ANCHOR GLASS CONTAINER CORP, Lawrenceburg: INP000187, minor permit, discharging to SOUTH DEARBORN RSD (OHIO R), permit term to September 30, 2022
ANCHOR GLASS CONTAINER CORPORATION, Lawrenceburg: IN0044016, minor permit, discharging to OHIO R VIA UNNAMED TRIBUTARY, permit term to April 30, 2021
AURORA CASKET CO. - VANGUARD, Aurora: INP000185, minor permit, discharging to SOUTH DEARBORN RSD (OHIO R), permit term to August 31, 2011
AURORA COMBINED COLLECTION SYSTEM, Aurora: IN0050903, minor permit, discharging to SOUTH DEARBORN RSD (OHIO RIVER), permit term to February 28, 2026
CATALENT PHARMA SOLUTIONS (FKA BETTERA BRANDS), Greendale: INP000709, minor permit, discharging to SOUTH DEARBORN RSD, permit term to September 30, 2025
CHURCH OF THE NAZARENE ADVISORY BOARD HIGHER GROUND SITEWORK, West Harrison: INRA09848, minor permit, permit term to June 2, 2027
CORE METALS GROUP LLC (MPM FACILITY), Aurora: INRM01017, minor permit, discharging to Hogan Creek, permit term to September 15, 2024
DAVE OMARA STOCKPILE MORGAN BRANCH ROAD, Aurora: INRA01563, minor permit, permit term to May 13, 2023

Identity

Facility as filed	DEARBORN COUNTY RSD HIGH RIDGE WWTP
Permittee as filed	HIGH RIDGE WWTP
NPDES ID	IN0063525
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	March 7, 2019
Expiration date	November 30, 2024
Issuing agency	IDEM
Address	Aurora, IN 47001
Receiving water	UNNAMED TRIB TO S HOGAN CREEK

Effluent limits and exceedances

11Pollutants on file
10Under a numeric limit
10With a violation of any kind
6With 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]	8	114	109	July 31, 2026	944% over the limit
Solids, total suspended	8	90	81	May 31, 2026	2,398% over the limit
E. coli, colony forming units [CFU]	3	60	60	June 30, 2026	27,219% over the limit
Chlorine, total residual	4	57	56	July 31, 2026	9,900% over the limit
Solids, suspended percent removal	0	8	8	October 31, 2019	209% over the limit
BOD, carbonaceous [5 day, 20 C]	8	11	7	February 28, 2026	328% over the limit
Oxygen, dissolved [DO]	2	6	0
pH	2	2	0
Flow, in conduit or thru treatment plant	1	2	0
Flow, total	1	1	0
Number of Events	2	0	0

Inspections, violations and enforcement

4Single-event violations

Date	What EPA recorded	Agency
April 6, 2026	Management Practice Violations - Best Management Practice Deficiencies	ST6
April 6, 2026	Management Practice Violations - Inflow/Infiltration (I/I)	ST6
April 6, 2026	Management Practice Violations - Improper Operation and Maintenance	ST6
April 6, 2026	Effluent Violations - Numeric effluent violation	ST6

Inspections

Date	What EPA recorded	Agency
April 6, 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
April 6, 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 the Clean Water Act discharge permit NPDES IN0063525 held by Dearborn County RSD High Ridge WWTP in Aurora, IN, which discharges to Unnamed Trib To S Hogan Creek and is administratively continued. The page lists 6 pollutants with an effluent exceedance and 11 pollutants on file, of which 10 are under a numeric limit.