Clean Water Act discharge permit · NPDES IA0076651

MOUNT STERLING, CITY OF STP, Mount Sterling, IA: NPDES IA0076651 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
5Pollutants under a numeric limit
1Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

MOUNT STERLING, CITY OF STP, held by REGIONAL UTILITY SERVICE SYSTEMS, holds NPDES permit IA0076651. EPA’s file records it issued May 1, 2017 and expiring April 30, 2022.

MOUNT STERLING, CITY OF STP, Mount Sterling, Iowa: Individual permit IA0076651, held by REGIONAL UTILITY SERVICE SYSTEMS; Publicly owned treatment works; Effective; issued May 1, 2017, term to April 30, 2022, by STA; Sewage Treatment Facilities.

Flow, in conduit or thru treatment plant: 0 limits, 8 violations of any kind, 8 effluent exceedances, latest January 31, 2010, largest 153% over the limit.
Solids, total suspended: 9 limits, 14 violations of any kind, 0 effluent exceedances.
BOD, carbonaceous [5 day, 20 C]: 4 limits, 12 violations of any kind, 0 effluent exceedances.
Nitrogen, ammonia total [as N]: 48 limits, 0 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
pH: 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; 216 were issued before IA0076651. REGIONAL UTILITY SERVICE SYSTEMS holds 9 permits in Iowa.

Other permits held by REGIONAL UTILITY SERVICE SYSTEMS

KINROSS, CITY OF STP (RUSS), Kinross: IA0077186, issued August 1, 2017
WEBSTER, CITY OF STP, Webster: IA0078719, issued September 22, 2009
MARTINSBURG, CITY OF STP, Martinsburg: IA0078727, issued September 22, 2009
HARPER, CITY OF STP, Harper: IA0079359, issued March 1, 2021
KESWICK, CITY OF STP, Keswick: IA0079910, issued June 1, 2017
PLEASANT PLAIN CITY OF STP (RUSS), Brighton: IA0082554, issued September 1, 2010
MOUNT UNION CITY OF (RUSS), Mount Union: IA0082881, issued June 1, 2011
OLLIE, CITY OF STP, Ollie: IA0083801, issued March 1, 2015

Coverages issued nearest IA0076651

May 1, 2017: LARCHWOOD CITY OF STP, Larchwood, IA0047333, held by CITY OF LARCHWOOD
May 1, 2017: PRESTON CITY OF STP, Preston, IA0047864, held by CITY OF PRESTON
May 1, 2017: PARNELL CITY OF STP, Parnell, IA0071188, held by CITY OF PARNELL
May 1, 2017: MACBRIDE SANITARY SEWER DISTRICT, Solon, IA0073580
May 1, 2017: PARK HILLS WASTEWATER FACILITY, Otley, IA0075434, held by CENTRAL IOWA WATER ASSOCIATION
May 1, 2017: HUXLEY CITY OF STP, Huxley, IA0083518, held by CITY OF HUXLEY
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

MOUNT STERLING, CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the Burnt Shirt Branch-Fox River subwatershed (HUC 071100010206), IA0076651 among them. Its county holds 8, 0 of them major permits; IA0076651 is a minor permit.

Identity

Facility as filed	MOUNT STERLING, CITY OF STP
Permittee as filed	REGIONAL UTILITY SERVICE SYSTEMS
NPDES ID	IA0076651
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	May 1, 2017
Expiration date	April 30, 2022
Issuing agency	STA
Address	Mount Sterling, IA 52573
Subwatershed	Burnt Shirt Branch-Fox River (HUC 071100010206)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

6Pollutants on file
5Under a numeric limit
3With a violation of any kind
1With 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	8	8	January 31, 2010	153% over the limit
Solids, total suspended	9	14	0
BOD, carbonaceous [5 day, 20 C]	4	12	0
Nitrogen, ammonia total [as N]	48	0	0
BOD, 5-day, 20 deg. C	5	0	0
pH	2	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0076651.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0076651.

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 IA0076651.

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

This public-records page covers NPDES permit IA0076651 for Mount Sterling, City of STP in Mount Sterling, IA, held by Regional Utility Service Systems, with the permit's status listed as Effective and its discharger class as Minor. The page lists 6 pollutants on file, 5 under a numeric limit, and 1 pollutant with an effluent exceedance, within the Burnt Shirt Branch-Fox River watershed (HUC 071100010206).