Clean Water Act discharge permit · NPDES CTUIC0367

THE STANWICH SCHOOL INC., Greenwich, CT: NPDES CTUIC0367 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
22Pollutants under a numeric limit
3Pollutants with an effluent exceedance

THE STANWICH SCHOOL INC., held by THE STANWICH SCHOOL INC., holds NPDES permit CTUIC0367. EPA’s file records it issued June 15, 2020 and expiring June 30, 2030. 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	THE STANWICH SCHOOL INC.
Permittee as filed	THE STANWICH SCHOOL INC.
NPDES ID	CTUIC0367
Permit status	Effective
Permit type	State-issued individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	June 15, 2020
Expiration date	June 30, 2030
Issuing agency	CT DEEP
Address	Greenwich, CT 06830
Receiving water impaired	303(D) Listed
Subwatershed	Blind Brook-Horseneck Brook (HUC 011000060405)

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

Effluent limits and exceedances

22Pollutants on file
22Under a numeric limit
22With a violation of any kind
3With 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, total [as N]	6	52	6	January 31, 2023	361% over the limit
Phosphorus, total [as P]	3	42	2	February 28, 2022	30% over the limit
Solids, total suspended	4	55	1	September 30, 2022	33% over the limit
pH	10	102	0
Nitrogen, Kjeldahl, total [as N]	7	60	0
Nitrogen, nitrite total [as N]	6	46	0
Nitrogen, nitrate total [as N]	6	46	0
Oil & Grease	3	43	0
Turbidity	3	40	0
BOD, 5-day, 20 deg. C	3	40	0
Alkalinity, total [as CaCO3]	3	40	0
Flow rate	2	26	0
Ammonia, unionized	2	26	0
Phosphate, ortho [as P]	2	26	0
Nitrogen, ammonia total [as N]	4	20	0
Phosphorus, dissolved	4	20	0
Depth to water level ft below landsurface	4	20	0
Coliform, fecal general	4	20	0
Temperature, water deg. fahrenheit	1	14	0
E. coli	1	13	0
pH, maximum	1	13	0
pH, minimum	1	13	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 CTUIC0367.

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

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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 CTUIC0367 there.

Nearby on the register

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

This public-records page covers NPDES permit CTUIC0367, held by THE STANWICH SCHOOL INC. in Greenwich, CT, with its status shown as Effective and a discharger class of Minor. The listed figures are 22 pollutants on file, 22 under a numeric limit, 22 with a violation of any kind, and 3 with an effluent exceedance.