Clean Water Act discharge permit · NPDES IL0075388

CASTLE RIDGE ESTATES STP, Troy, IL: NPDES IL0075388 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
9Pollutants under a numeric limit
2Pollutants with an effluent exceedance

CASTLE RIDGE ESTATES STP, held by CASTLE RIDGE HOMEOWNERS ASSOCIATION, holds NPDES permit IL0075388, which discharges to Unnamed Tributary To Mill Creek. EPA’s file records it issued August 13, 2020 and expiring August 31, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	CASTLE RIDGE ESTATES STP
Permittee as filed	CASTLE RIDGE HOMEOWNERS ASSOCIATION
NPDES ID	IL0075388
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	August 13, 2020
Expiration date	August 31, 2025
Address	Troy, IL 62294
Receiving water	UNNAMED TRIBUTARY TO MILL CREEK
Subwatershed	Mill Creek-Silver Creek (HUC 071402040509)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

9Pollutants on file
9Under a numeric limit
6With a violation of any kind
2With 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]	16	13	9	April 30, 2022	210% over the limit
BOD, carbonaceous [5 day, 20 C]	4	1	1	June 30, 2004	100% over the limit
Chlorine, total residual	1	11	0
Flow, in conduit or thru treatment plant	4	8	0
Solids, total suspended	5	3	0
BOD, 5-day, 20 deg. C	1	3	0
Oxygen, dissolved [DO]	5	0	0
pH	2	0	0
Coliform, fecal general	1	0	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0075388.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IL0075388.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IL0075388 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES IL0075388 for CASTLE RIDGE ESTATES STP in Troy, IL, held by CASTLE RIDGE HOMEOWNERS ASSOCIATION, which discharges to UNNAMED TRIBUTARY TO MILL CREEK in the Mill Creek-Silver Creek subwatershed (HUC 071402040509). The permit is listed as administratively continued, with a minor discharger class, and the file shows 9 pollutants on file, 2 pollutants under a numeric limit, and 2 pollutants with an effluent exceedance.