Clean Water Act discharge permit · NPDES IA0025968

GILBERT, CITY OF STP, Gilbert, IA: NPDES IA0025968 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
7Pollutants under a numeric limit
6Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

GILBERT, CITY OF STP, held by CITY OF GILBERT, holds NPDES permit IA0025968. EPA’s file records it issued June 1, 2020 and expiring May 31, 2025.

GILBERT, CITY OF STP, Gilbert, Iowa: Individual permit IA0025968, held by CITY OF GILBERT; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued June 1, 2020, term to May 31, 2025, by STA; Sewage Treatment Facilities.

Flow, in conduit or thru treatment plant: 0 limits, 16 violations of any kind, 13 effluent exceedances, latest May 31, 2010, largest 71,020% over the limit.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 31 violations of any kind, 12 effluent exceedances, latest May 31, 2019, largest 52% over the limit.
Nitrogen, ammonia total [as N]: 48 limits, 16 violations of any kind, 10 effluent exceedances, latest October 31, 2025, largest 266% over the limit.
pH: 5 limits, 16 violations of any kind, 7 effluent exceedances, latest January 31, 2024.
Solids, total suspended: 9 limits, 23 violations of any kind, 4 effluent exceedances, latest March 31, 2024, largest 53% over the limit.
Oxygen, dissolved [DO]: 1 limit, 7 violations of any kind, 1 effluent exceedance, latest July 31, 2026, largest 16% over the limit.
BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
E. coli: 2 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; 541 were issued before IA0025968.

Coverages issued nearest IA0025968

May 1, 2020: DAVIS CITY, CITY OF STP (SIRWA), Davis City, IA0060232, held by SOUTHERN IOWA RURAL WATER ASSOCIATION
May 1, 2020: ASBURY CITY OF STP, Asbury, IA0069922, held by CITY OF ASBURY
May 1, 2020: IOWA CITY, CITY OF (SOUTH) STP, Iowa City, IA0070866, held by CITY OF IOWA CITY
May 1, 2020: WESTGATE, CITY OF-STP, Westgate, IA0075353, held by CITY OF WESTGATE
June 1, 2020: MAQUOKETA CITY OF STP, Maquoketa, IA0024481, held by CITY OF MAQUOKETA
June 1, 2020: AVOCA CITY OF STP, Avoca, IA0030708, held by CITY OF AVOCA
June 1, 2020: WINTHROP CITY OF STP, Winthrop, IA0032808, held by CITY OF WINTHROP
June 1, 2020: EARLY CITY OF STP, Early, IA0035904, held by CITY OF EARLY
June 1, 2020: KELLOGG CITY OF STP, Kellogg, IA0043541, held by CITY OF KELLOGG
June 1, 2020: UNIVERSITY PARK CITY OF STP, University Park, IA0047741, held by MAHASKA RURAL WATER SYSTEM INC.

GILBERT, CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Lundys Creek-Squaw Creek subwatershed (HUC 070801050306), IA0025968 among them. Its county holds 28, 3 of them major permits; IA0025968 is a minor permit.

Other permits in the Lundys Creek-Squaw Creek subwatershed (HUC 070801050306)

SOUTH SQUAW VALLEY ASSOCIATION, Ames: IA0068276, minor permit, permit term to June 30, 2027

Identity

Facility as filed	GILBERT, CITY OF STP
Permittee as filed	CITY OF GILBERT
NPDES ID	IA0025968
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, 2020
Expiration date	May 31, 2025
Issuing agency	STA
Address	Gilbert, IA 50105
Subwatershed	Lundys Creek-Squaw Creek (HUC 070801050306)
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
6With 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	16	13	May 31, 2010	71,020% over the limit
BOD, carbonaceous [5 day, 20 C]	4	31	12	May 31, 2019	52% over the limit
Nitrogen, ammonia total [as N]	48	16	10	October 31, 2025	266% over the limit
pH	5	16	7	January 31, 2024
Solids, total suspended	9	23	4	March 31, 2024	53% over the limit
Oxygen, dissolved [DO]	1	7	1	July 31, 2026	16% over the limit
BOD, 5-day, 20 deg. C	5	0	0
E. coli	2	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0025968.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0025968.

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 IA0025968.

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

This public-records page covers NPDES permit IA0025968 for GILBERT, CITY OF STP in Gilbert, IA, held by CITY OF GILBERT, which is administratively continued and classed as a minor discharger. The page lists 7 pollutants under a numeric limit, 6 pollutants with an effluent exceedance, and 8 pollutants on file, with the permit's issue and expiration dates as EPA's file stood on October 14, 2026.