Clean Water Act discharge permit · NPDES IA0028517

ARMSTRONG CITY OF STP, Armstrong, IA: NPDES IA0028517 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
9Pollutants under a numeric limit
7Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

ARMSTRONG CITY OF STP, held by CITY OF ARMSTRONG, holds NPDES permit IA0028517. EPA’s file records it issued June 1, 2022 and expiring May 31, 2027.

ARMSTRONG CITY OF STP, Armstrong, Iowa: Individual permit IA0028517, held by CITY OF ARMSTRONG; Publicly owned treatment works; Effective; issued June 1, 2022, term to May 31, 2027, by STA.

Nitrogen, ammonia total [as N]: 48 limits, 155 violations of any kind, 145 effluent exceedances, latest April 30, 2026, largest 633% over the limit.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 94 violations of any kind, 56 effluent exceedances, latest March 31, 2026, largest 703% over the limit.
pH: 5 limits, 40 violations of any kind, 18 effluent exceedances, latest October 31, 2024.
Oxygen, dissolved [DO]: 1 limit, 21 violations of any kind, 18 effluent exceedances, latest July 31, 2024, largest 88% over the limit.
E. coli: 0 limits, 7 violations of any kind, 6 effluent exceedances, latest September 30, 2025, largest 418% over the limit.
Solids, total suspended: 9 limits, 53 violations of any kind, 3 effluent exceedances, latest April 30, 2024, largest 167% over the limit.
Oil & Grease: 0 limits, 14 violations of any kind, 2 effluent exceedances, latest August 31, 2025, largest 7% over the limit.
Cyanide, total [as CN]: 4 limits, 20 violations of any kind, 0 effluent exceedances.
Copper, total [as Cu]: 4 limits, 16 violations of any kind, 0 effluent exceedances.
Nitrogen, nitrate total [as N]: 2 limits, 14 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 5 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; 686 were issued before IA0028517.

Coverages issued nearest IA0028517

April 1, 2022: EDDYVILLE, CITY OF STP, Eddyville, IA0020770, held by CITY OF EDDYVILLE
April 1, 2022: CLARINDA CITY OF STP, Clarinda, IA0035190, held by CITY OF CLARINDA
April 1, 2022: PELLA CITY OF STP, Pella, IA0043869, held by CITY OF PELLA
May 1, 2022: BAXTER CITY OF STP, Baxter, IA0023353, held by CITY OF BAXTER
May 1, 2022: RUNNELLS CITY OF STP, Runnells, IA0063355, held by CITY OF RUNNELLS
June 1, 2022: SOLON CITY OF STP, Solon, IA0036978, held by CITY OF SOLON
July 1, 2022: FARRAGUT CITY OF STP, Farragut, IA0023493, held by CITY OF FARRAGUT
August 1, 2022: CORNING CITY OF STP, Corning, IA0027375, held by CITY OF CORNING
August 1, 2022: GUTHRIE CENTER CITY OF STP, Guthrie Center, IA0041866, held by CITY OF GUTHRIE CENTER
August 1, 2022: WALKER CITY OF STP, Walker, IA0059081, held by CITY OF WALKER

ARMSTRONG CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the Crooked Run-East Fork Des Moines River subwatershed (HUC 071000030303), IA0028517 among them. Its county holds 7, 1 of them major permits; IA0028517 is a minor permit.

Identity

Facility as filed	ARMSTRONG CITY OF STP
Permittee as filed	CITY OF ARMSTRONG
NPDES ID	IA0028517
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	June 1, 2022
Expiration date	May 31, 2027
Issuing agency	STA
Address	Armstrong, IA 50514
Subwatershed	Crooked Run-East Fork Des Moines River (HUC 071000030303)

Effluent limits and exceedances

11Pollutants on file
9Under a numeric limit
10With a violation of any kind
7With 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	155	145	April 30, 2026	633% over the limit
BOD, carbonaceous [5 day, 20 C]	4	94	56	March 31, 2026	703% over the limit
pH	5	40	18	October 31, 2024
Oxygen, dissolved [DO]	1	21	18	July 31, 2024	88% over the limit
E. coli	0	7	6	September 30, 2025	418% over the limit
Solids, total suspended	9	53	3	April 30, 2024	167% over the limit
Oil & Grease	0	14	2	August 31, 2025	7% over the limit
Cyanide, total [as CN]	4	20	0
Copper, total [as Cu]	4	16	0
Nitrogen, nitrate total [as N]	2	14	0
BOD, 5-day, 20 deg. C	5	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0028517.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0028517.

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 IA0028517.

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

This public-records page covers NPDES discharge permit IA0028517 for ARMSTRONG CITY OF STP in Armstrong, IA, held by CITY OF ARMSTRONG, with the permit status listed as Effective. The page lists 11 pollutants on file, 9 under a numeric limit, 10 with a violation of any kind, and 7 with an effluent exceedance, within the Crooked Run-East Fork Des Moines River (HUC 071000030303) subwatershed.