Clean Water Act discharge permit · NPDES IA0027871

LEON CITY OF STP, Leon, IA: NPDES IA0027871 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
4Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

LEON CITY OF STP, held by CITY OF LEON, holds NPDES permit IA0027871. EPA’s file records it issued November 1, 2019 and expiring October 31, 2024.

LEON CITY OF STP, Leon, Iowa: Individual permit IA0027871, held by CITY OF LEON; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued November 1, 2019, term to October 31, 2024, by STA; Sewage Treatment Facilities.

Solids, total suspended: 9 limits, 16 violations of any kind, 8 effluent exceedances, latest October 31, 2025, largest 74% over the limit.
Nitrogen, ammonia total [as N]: 48 limits, 7 violations of any kind, 7 effluent exceedances, latest July 31, 2025, largest 186% over the limit.
pH: 5 limits, 6 violations of any kind, 2 effluent exceedances, latest May 31, 2018.
E. coli: 1 limit, 3 violations of any kind, 1 effluent exceedance, latest June 30, 2022, largest 133% over the limit.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 8 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 1 limit, 4 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 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.
Phosphorus, total [as P]: 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; 481 were issued before IA0027871. CITY OF LEON holds 2 permits in Iowa.

Other permits held by CITY OF LEON

LEON WATER TREATMENT PLANT, Leon: IA0081787, issued August 22, 2008

Coverages issued nearest IA0027871

October 1, 2019: OAKLAND CITY OF STP, Oakland, IA0033448, held by CITY OF OAKLAND
October 1, 2019: WHEATLAND CITY OF STP, Wheatland, IA0058912, held by CITY OF WHEATLAND
October 1, 2019: BALLTOWN, CITY OF-NORTH WWTF, Sherrill, IA0076911, held by CITY OF BALLTOWN
October 1, 2019: BALLTOWN, CITY OF-SOUTH WWTF, Sherrill, IA0076929, held by CITY OF BALLTOWN
November 1, 2019: GMU WASTEWATER TREATMENT FACILITY, Glenwood, IA0021946, held by GLENWOOD MUNICIPAL UTILITIES
November 1, 2019: FLOYD CITY OF STP, Floyd, IA0028894, held by CITY OF FLOYD
November 1, 2019: ATLANTIC CITY OF STP, Atlantic, IA0029025, held by CITY OF ATLANTIC
November 1, 2019: DEDHAM CITY OF STP, Dedham, IA0035181, held by CITY OF DEDHAM
November 1, 2019: WEST BEND CITY OF STP, West Bend, IA0036994, held by CITY OF WEST BEND
November 1, 2019: MOVILLE CITY OF STP, Moville, IA0042943, held by CITY OF MOVILLE

LEON CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the McGruder Creek-Little River subwatershed (HUC 102801020703), IA0027871 among them. Its county holds 10, 0 of them major permits; IA0027871 is a minor permit.

Identity

Facility as filed	LEON CITY OF STP
Permittee as filed	CITY OF LEON
NPDES ID	IA0027871
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	November 1, 2019
Expiration date	October 31, 2024
Issuing agency	STA
Address	Leon, IA 50144
Subwatershed	McGruder Creek-Little River (HUC 102801020703)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

10Pollutants on file
10Under 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
Solids, total suspended	9	16	8	October 31, 2025	74% over the limit
Nitrogen, ammonia total [as N]	48	7	7	July 31, 2025	186% over the limit
pH	5	6	2	May 31, 2018
E. coli	1	3	1	June 30, 2022	133% over the limit
BOD, carbonaceous [5 day, 20 C]	4	8	0
Oxygen, dissolved [DO]	1	4	0
BOD, 5-day, 20 deg. C	5	0	0
Nitrogen, total [as N]	5	0	0
Nitrogen, Kjeldahl, total [as N]	5	0	0
Phosphorus, total [as P]	5	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0027871.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0027871.

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 IA0027871.

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

This public-records page covers the NPDES discharge permit IA0027871 held by CITY OF LEON for the LEON CITY OF STP in Leon, IA, an administratively continued minor discharger permit. The facts list 10 pollutants on file, 4 of which are under a numeric limit and 4 of which have an effluent exceedance.