Clean Water Act discharge permit · NPDES IA0044156

DENVER CITY OF STP, Denver, IA: NPDES IA0044156 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
9Pollutants under a numeric limit
6Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

DENVER CITY OF STP, held by CITY OF DENVER, holds NPDES permit IA0044156. EPA’s file records it issued March 1, 2017 and expiring February 28, 2022.

DENVER CITY OF STP, Denver, Iowa: Individual permit IA0044156, held by CITY OF DENVER; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued March 1, 2017, term to February 28, 2022, by STA.

BOD, carbonaceous [5 day, 20 C]: 48 limits, 145 violations of any kind, 139 effluent exceedances, latest February 29, 2016, largest 22,569% over the limit.
Flow, in conduit or thru treatment plant: 0 limits, 123 violations of any kind, 123 effluent exceedances, latest February 28, 2017, largest 100,612% over the limit.
Nitrogen, ammonia total [as N]: 48 limits, 100 violations of any kind, 96 effluent exceedances, latest December 31, 2020, largest 8,747% over the limit.
Solids, total suspended: 9 limits, 41 violations of any kind, 35 effluent exceedances, latest February 29, 2016, largest 6,270% over the limit.
pH: 5 limits, 41 violations of any kind, 35 effluent exceedances, latest June 30, 2019.
Oxygen, dissolved [DO]: 1 limit, 11 violations of any kind, 6 effluent exceedances, latest May 31, 2019, largest 16% over the limit.
Nitrogen, total [as N]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 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; 193 were issued before IA0044156.

Coverages issued nearest IA0044156

March 1, 2017: SHELL ROCK CITY OF STP, Shell Rock, IA0033359, held by CITY OF SHELL ROCK
March 1, 2017: WINFIELD CITY OF STP, Winfield, IA0033367, held by CITY OF WINFIELD
March 1, 2017: CONRAD CITY OF STP, Conrad, IA0034355, held by CITY OF CONRAD
March 1, 2017: SUTHERLAND CITY OF STP, Sutherland, IA0036129, held by CITY OF SUTHERLAND
March 1, 2017: CARSON CITY OF STP, Carson, IA0042901, held by CITY OF CARSON
March 1, 2017: RUTLAND CITY OF STP, Rutland, IA0061239, held by CITY OF RUTLAND
March 1, 2017: RICHLAND CITY OF STP, Richland, IA0061328, held by CITY OF RICHLAND
March 1, 2017: SILVER CITY, CITY OF STP, Silver City, IA0079774, held by CITY OF SILVER CITY
April 1, 2017: MINBURN CITY OF STP, Minburn, IA0023418, held by CITY OF MINBURN
April 1, 2017: LANSING CITY OF STP, Lansing, IA0024597, held by CITY OF LANSING

DENVER CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the Quarter Section Run subwatershed (HUC 070802011103), IA0044156 among them. Its county holds 9, 1 of them major permits; IA0044156 is a minor permit.

Identity

Facility as filed	DENVER CITY OF STP
Permittee as filed	CITY OF DENVER
NPDES ID	IA0044156
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	March 1, 2017
Expiration date	February 28, 2022
Issuing agency	STA
Address	Denver, IA 50622
Subwatershed	Quarter Section Run (HUC 070802011103)

Effluent limits and exceedances

10Pollutants on file
9Under a numeric limit
7With 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
BOD, carbonaceous [5 day, 20 C]	48	145	139	February 29, 2016	22,569% over the limit
Flow, in conduit or thru treatment plant	0	123	123	February 28, 2017	100,612% over the limit
Nitrogen, ammonia total [as N]	48	100	96	December 31, 2020	8,747% over the limit
Solids, total suspended	9	41	35	February 29, 2016	6,270% over the limit
pH	5	41	35	June 30, 2019
Oxygen, dissolved [DO]	1	11	6	May 31, 2019	16% over the limit
Nitrogen, total [as N]	2	6	0
BOD, 5-day, 20 deg. C	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 IA0044156.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0044156.

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 IA0044156.

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

This public-records page covers NPDES permit IA0044156, held by CITY OF DENVER for the DENVER CITY OF STP facility in Denver, IA, within HUC 070802011103 (Quarter Section Run). The permit is listed as administratively continued, with a Minor Discharger class, and the file shows 10 pollutants on file, 9 under a numeric limit, 7 with a violation of any kind, and 6 with an effluent exceedance.