Clean Water Act discharge permit · NPDES IA0058548

WORTHINGTON CITY OF STP, Worthington, IA: NPDES IA0058548 discharge permit, effluent exceedances, inspections, penalties

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

WORTHINGTON CITY OF STP, held by CITY OF WORTHINGTON, holds NPDES permit IA0058548. EPA’s file records it issued June 1, 2017 and expiring May 31, 2022.

WORTHINGTON CITY OF STP, Worthington, Iowa: Individual permit IA0058548, held by CITY OF WORTHINGTON; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued June 1, 2017, term to May 31, 2022, by STA; Sewage Treatment Facilities.

Flow, in conduit or thru treatment plant: 0 limits, 29 violations of any kind, 29 effluent exceedances, latest August 31, 2010, largest 20,376% over the limit.
Solids, total suspended: 9 limits, 16 violations of any kind, 8 effluent exceedances, latest September 30, 2025, largest 1,920% over the limit.
Nitrogen, ammonia total [as N]: 48 limits, 23 violations of any kind, 3 effluent exceedances, latest September 30, 2025, largest 688% over the limit.
pH: 5 limits, 3 violations of any kind, 3 effluent exceedances, latest February 28, 2026.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 10 violations of any kind, 2 effluent exceedances, latest September 30, 2025, largest 4,540% over the limit.
E. coli: 0 limits, 1 violation 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; 228 were issued before IA0058548.

Coverages issued nearest IA0058548

June 1, 2017: GILBERTVILLE CITY OF STP, Gilbertville, IA0028177, held by CITY OF GILBERTVILLE
June 1, 2017: EVERLY CITY OF STP, Everly, IA0028916, held by City of Everly
June 1, 2017: AKRON CITY OF STP, Akron, IA0035211, held by CITY OF AKRON
June 1, 2017: LOST NATION CITY OF STP, Lost Nation, IA0036544, held by CITY OF LOST NATION
June 1, 2017: CEDAR RAPIDS CITY OF STP, Cedar Rapids, IA0042641, held by CITY OF CEDAR RAPIDS
June 1, 2017: AINSWORTH CITY OF STP, Ainsworth, IA0069183, held by CITY OF AINSWORTH
June 1, 2017: KESWICK, CITY OF STP, Keswick, IA0079910, held by REGIONAL UTILITY SERVICE SYSTEMS
July 1, 2017: DYSART CITY OF STP, Dysart, IA0020745, held by CITY OF DYSART
July 1, 2017: EDGEWOOD CITY OF STP, Edgewood, IA0024490, held by CITY OF EDGEWOOD
July 1, 2017: NEW ALBIN CITY OF STP, New Albin, IA0026611, held by CITY OF NEW ALBIN

WORTHINGTON CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Durion Creek-North Fork Maquoketa River subwatershed (HUC 070600060604), IA0058548 among them. Its county holds 57, 3 of them major permits; IA0058548 is a minor permit.

Other permits in the Durion Creek-North Fork Maquoketa River subwatershed (HUC 070600060604)

DYERSVILLE CITY OF STP, Dyersville: IA0023345, major permit, permit term to April 30, 2025

Identity

Facility as filed	WORTHINGTON CITY OF STP
Permittee as filed	CITY OF WORTHINGTON
NPDES ID	IA0058548
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	June 1, 2017
Expiration date	May 31, 2022
Issuing agency	STA
Address	Worthington, IA 52078
Subwatershed	Durion Creek-North Fork Maquoketa River (HUC 070600060604)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

7Pollutants on file
5Under 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	29	29	August 31, 2010	20,376% over the limit
Solids, total suspended	9	16	8	September 30, 2025	1,920% over the limit
Nitrogen, ammonia total [as N]	48	23	3	September 30, 2025	688% over the limit
pH	5	3	3	February 28, 2026
BOD, carbonaceous [5 day, 20 C]	4	10	2	September 30, 2025	4,540% over the limit
E. coli	0	1	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 IA0058548.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0058548.

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 IA0058548.

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

This public-records page covers Clean Water Act discharge permit NPDES IA0058548 for WORTHINGTON CITY OF STP in Worthington, IA, held by CITY OF WORTHINGTON, with the permit status listed as administratively continued and a Minor Discharger class. The page lists 5 pollutants under a numeric limit and 5 pollutants with an effluent exceedance, within the Durion Creek-North Fork Maquoketa River watershed (HUC 070600060604).