Clean Water Act discharge permit · NPDES IA0061310

WOOLSTOCK CITY OF STP, Woolstock, IA: NPDES IA0061310 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
9Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

WOOLSTOCK CITY OF STP, held by CITY OF WOOLSTOCK, holds NPDES permit IA0061310. EPA’s file records it issued December 1, 2016 and expiring November 30, 2021.

WOOLSTOCK CITY OF STP, Woolstock, Iowa: Individual permit IA0061310, held by CITY OF WOOLSTOCK; 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.

Nitrogen, ammonia total [as N]: 48 limits, 30 violations of any kind, 28 effluent exceedances, latest June 30, 2026, largest 248% over the limit.
Flow, in conduit or thru treatment plant: 0 limits, 7 violations of any kind, 7 effluent exceedances, latest June 30, 2008, largest 221% over the limit.
BOD, carbonaceous [5 day, 20 C]: 5 limits, 4 violations of any kind, 4 effluent exceedances, latest October 31, 2025, largest 60% over the limit.
Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 1 effluent exceedance, latest April 30, 2024, largest 39% over the limit.
pH: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Annual Nitrate Nitrogen Discharged: 1 limit, 6 violations of any kind, 0 effluent exceedances.
Solids, total suspended: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, nitrate total [as N]: 5 limits, 0 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 IA0061310.

Coverages issued nearest IA0061310

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: DELHI CITY OF STP, Delhi, IA0047848, held by CITY OF DELHI
December 1, 2016: AUBURN CITY OF STP, Auburn, IA0057029, held by CITY OF AUBURN
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
January 1, 2017: JANESVILLE CITY OF STP, Janesville, IA0026506, held by CITY OF JANESVILLE
January 1, 2017: ROSE HILL CITY OF STP, Rose Hill, IA0072311, held by MAHASKA RURAL WATER SYSTEMS, INC

WOOLSTOCK CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Eagle Creek subwatershed (HUC 071000050403), IA0061310 among them. Its county holds 15, 1 of them major permits; IA0061310 is a minor permit.

Other permits in the Eagle Creek subwatershed (HUC 071000050403)

CLARION, CITY OF STP, Clarion: IA0030945, major permit, permit term to November 30, 2017

Identity

Facility as filed	WOOLSTOCK CITY OF STP
Permittee as filed	CITY OF WOOLSTOCK
NPDES ID	IA0061310
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	Woolstock, IA 50599
Subwatershed	Eagle Creek (HUC 071000050403)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

10Pollutants on file
9Under a numeric limit
6With 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	30	28	June 30, 2026	248% over the limit
Flow, in conduit or thru treatment plant	0	7	7	June 30, 2008	221% over the limit
BOD, carbonaceous [5 day, 20 C]	5	4	4	October 31, 2025	60% over the limit
Oxygen, dissolved [DO]	1	2	1	April 30, 2024	39% over the limit
pH	2	6	0
Annual Nitrate Nitrogen Discharged	1	6	0
Solids, total suspended	5	0	0
Nitrogen, nitrate total [as N]	5	0	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 IA0061310.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0061310.

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 IA0061310.

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

This public-records page covers NPDES discharge permit IA0061310 for the WOOLSTOCK CITY OF STP in Woolstock, IA, held by the CITY OF WOOLSTOCK, which EPA's file records as issued December 1, 2016 and expiring November 30, 2021, now administratively continued. The page lists 10 pollutants on file, 9 of them with effluent limits, 4 of which have an effluent exceedance.