Clean Water Act discharge permit · NPDES IA0047848

DELHI CITY OF STP, Delhi, IA: NPDES IA0047848 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
7Pollutants under a numeric limit
5Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

DELHI CITY OF STP, held by CITY OF DELHI, holds NPDES permit IA0047848. EPA’s file records it issued December 1, 2016 and expiring November 30, 2021.

DELHI CITY OF STP, Delhi, Iowa: Individual permit IA0047848, held by CITY OF DELHI; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued December 1, 2016, term to November 30, 2021, by STA; Sewage Treatment Facilities.

Flow, in conduit or thru treatment plant: 0 limits, 70 violations of any kind, 70 effluent exceedances, latest April 30, 2006, largest 358% over the limit.
Nitrogen, ammonia total [as N]: 48 limits, 73 violations of any kind, 5 effluent exceedances, latest December 31, 2023, largest 61% over the limit.
pH: 2 limits, 67 violations of any kind, 3 effluent exceedances, latest April 30, 2014.
Solids, total suspended: 5 limits, 62 violations of any kind, 2 effluent exceedances, latest December 31, 2025, largest 350% over the limit.
BOD, carbonaceous [5 day, 20 C]: 5 limits, 61 violations of any kind, 1 effluent exceedance, latest December 31, 2025, largest 24% over the limit.
Oxygen, dissolved [DO]: 1 limit, 16 violations of any kind, 0 effluent exceedances.
E. coli: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Depth of pond or reservoir in feet: 3 limits, 0 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 171 were issued before IA0047848.

Coverages issued nearest IA0047848

November 1, 2016: BAYARD CITY OF STP, Bayard, IA0061468, held by CITY OF BAYARD
November 1, 2016: DEWAR SANITARY DISTRICT STP, Dewar, IA0063908, held by DEWAR SANITARY DISTRICT
November 1, 2016: FESTINA-WINNESHIEK COUNTY-STP, Festina, IA0075442, held by WINNESHIEK COUNTY
December 1, 2016: MECHANICSVILLE CITY OF STP, Mechanicsville, IA0022314, held by CITY OF MECHANICSVILLE
December 1, 2016: DEWITT CITY OF STP, De Witt, IA0035271, held by CITY OF DEWITT
December 1, 2016: AUBURN CITY OF STP, Auburn, IA0057029, held by CITY OF AUBURN
December 1, 2016: WOOLSTOCK CITY OF STP, Woolstock, IA0061310, held by CITY OF WOOLSTOCK
December 1, 2016: LANESBORO CITY OF STP, Lanesboro, IA0062162, held by CITY OF LANESBORO
December 1, 2016: ARCHER CITY OF STP, Archer, IA0082422, held by IOWA LAKES REGIONAL WATER
January 1, 2017: BEDFORD CITY OF STP, Bedford, IA0026018, held by CITY OF BEDFORD

DELHI CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Allison Creek-Maquoketa River subwatershed (HUC 070600060210), IA0047848 among them. Its county holds 19, 0 of them major permits; IA0047848 is a minor permit.

Other permits in the Allison Creek-Maquoketa River subwatershed (HUC 070600060210)

MANCHESTER CITY OF STP, Manchester: IA0021032, minor permit, permit term to June 30, 2020

Identity

Facility as filed	DELHI CITY OF STP
Permittee as filed	CITY OF DELHI
NPDES ID	IA0047848
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	December 1, 2016
Expiration date	November 30, 2021
Issuing agency	STA
Address	Delhi, IA 52223
Subwatershed	Allison Creek-Maquoketa River (HUC 070600060210)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

8Pollutants on file
7Under a numeric limit
6With a violation of any kind
5With 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
Flow, in conduit or thru treatment plant	0	70	70	April 30, 2006	358% over the limit
Nitrogen, ammonia total [as N]	48	73	5	December 31, 2023	61% over the limit
pH	2	67	3	April 30, 2014
Solids, total suspended	5	62	2	December 31, 2025	350% over the limit
BOD, carbonaceous [5 day, 20 C]	5	61	1	December 31, 2025	24% over the limit
Oxygen, dissolved [DO]	1	16	0
E. coli	3	0	0
Depth of pond or reservoir in feet	3	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0047848.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0047848.

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 IA0047848.

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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers NPDES permit IA0047848, held by the City of Delhi for the DELHI CITY OF STP in Delhi, IA, a minor, publicly owned treatment works whose permit is administratively continued after its November 30, 2021 expiration. The page lists 8 pollutants on file, 7 of them under a numeric limit, and 5 pollutants with an effluent exceedance, with the status and dates as of October 14, 2026.