Clean Water Act discharge permit · NPDES IA0023302

DENISON MUNICIPAL UTILITIES-STP, Denison, IA: NPDES IA0023302 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
15Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

DENISON MUNICIPAL UTILITIES-STP, held by DENISON MUNICIPAL UTILITIES, holds NPDES permit IA0023302. EPA’s file records it issued January 1, 2021 and expiring December 31, 2025.

DENISON MUNICIPAL UTILITIES-STP, Denison, Iowa: Individual permit IA0023302, held by DENISON MUNICIPAL UTILITIES; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued January 1, 2021, term to December 31, 2025, by STA; Sewage Treatment Facilities.

Nitrogen, ammonia total [as N]: 48 limits, 43 violations of any kind, 19 effluent exceedances, latest September 30, 2023, largest 222% over the limit.
pH: 5 limits, 27 violations of any kind, 13 effluent exceedances, latest June 30, 2023.
Solids, total suspended: 9 limits, 27 violations of any kind, 3 effluent exceedances, latest November 30, 2011, largest 9% over the limit.
Flow, in conduit or thru treatment plant: 0 limits, 13 violations of any kind, 1 effluent exceedance, latest October 31, 1998, largest 4% over the limit.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 24 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Ceriodaphnia dubia: 1 limit, 6 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 6 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 15 limits, 0 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 10 limits, 0 violations of any kind, 0 effluent exceedances.
Copper, total [as Cu]: 9 limits, 0 violations of any kind, 0 effluent exceedances.
Thallium, total [as Tl]: 9 limits, 0 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Chloride [as Cl]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
E. coli: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 598 were issued before IA0023302. DENISON MUNICIPAL UTILITIES holds 2 permits in Iowa.

Other permits held by DENISON MUNICIPAL UTILITIES

DENISON MUNICIPAL UTILITIES, Denison: IAL023302, issued January 1, 2021

Coverages issued nearest IA0023302

December 1, 2020: SIOUX CITY, CITY OF STP, Sioux City, IA0043095, held by CITY OF SIOUX CITY
December 1, 2020: HUMBOLDT CITY OF STP, Humboldt, IA0047791, held by CITY OF HUMBOLDT
December 1, 2020: STANLEY CITY OF STP, Stanley, IA0054178, held by CITY OF STANLEY
December 1, 2020: MONTOUR CITY OF STP, Montour, IA0058700, held by CITY OF MONTOUR
January 1, 2021: MINGO CITY OF STP, Mingo, IA0022276, held by CITY OF MINGO
January 1, 2021: ESTHERVILLE CITY OF STP, Estherville, IA0023744, held by CITY OF ESTHERVILLE
January 1, 2021: MONTROSE CITY OF STP, Montrose, IA0030848, held by CITY OF MONTROSE
January 1, 2021: ROLAND CITY OF STP, Roland, IA0032425, held by CITY OF ROLAND
January 1, 2021: LA MOTTE CITY OF STP, La Motte, IA0056707, held by CITY OF LA MOTTE
February 1, 2021: EPWORTH CITY OF STP, Epworth, IA0036463, held by CITY OF EPWORTH

DENISON MUNICIPAL UTILITIES-STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Welsh Creek-Boyer River subwatershed (HUC 102300070304), IA0023302 among them. Its county holds 11, 1 of them major permits; IA0023302 is a major permit.

Other permits in the Welsh Creek-Boyer River subwatershed (HUC 102300070304)

DOW CITY, CITY OF STP, Dow City: IA0034371, minor permit, permit term to April 30, 2023

Identity

Facility as filed	DENISON MUNICIPAL UTILITIES-STP
Permittee as filed	DENISON MUNICIPAL UTILITIES
NPDES ID	IA0023302
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	January 1, 2021
Expiration date	December 31, 2025
Issuing agency	STA
Address	Denison, IA 51442
Subwatershed	Welsh Creek-Boyer River (HUC 102300070304)
Program components on file	Biosolids, POTW
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler IAD981500408

Effluent limits and exceedances

16Pollutants on file
15Under a numeric limit
7With a violation of any kind
4With 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]	48	43	19	September 30, 2023	222% over the limit
pH	5	27	13	June 30, 2023
Solids, total suspended	9	27	3	November 30, 2011	9% over the limit
Flow, in conduit or thru treatment plant	0	13	1	October 31, 1998	4% over the limit
BOD, carbonaceous [5 day, 20 C]	4	24	0
Toxicity [acute], Ceriodaphnia dubia	1	6	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	6	0
Nitrogen, total [as N]	15	0	0
Phosphorus, total [as P]	10	0	0
Copper, total [as Cu]	9	0	0
Thallium, total [as Tl]	9	0	0
BOD, 5-day, 20 deg. C	5	0	0
Nitrogen, Kjeldahl, total [as N]	5	0	0
Chloride [as Cl]	5	0	0
Oxygen, dissolved [DO]	1	0	0
E. coli	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0023302.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0023302.

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 IA0023302.

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

This public-records page covers the Clean Water Act NPDES discharge permit IA0023302 for DENISON MUNICIPAL UTILITIES-STP in Denison, IA, held by DENISON MUNICIPAL UTILITIES and listed as administratively continued with a Major Discharger class. The page lists 15 pollutants under a numeric limit and 4 pollutants with an effluent exceedance, and it sits within the Welsh Creek-Boyer River subwatershed (HUC 102300070304).