Clean Water Act discharge permit · NPDES MTG580012

TOWN OF SACO, Saco, MT: NPDES MTG580012 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
9Pollutants under a numeric limit
5Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

TOWN OF SACO holds NPDES permit MTG580012, which discharges to Beaver Creek. EPA’s file records it issued January 18, 2018 and expiring December 31, 2022.

TOWN OF SACO, Saco, Montana: Coverage under a general permit MTG580012; Publicly owned treatment works; Effective; issued January 18, 2018, term to December 31, 2022; discharges to BEAVER CREEK.

BOD, 5-day, 20 deg. C: 6 limits, 43 violations of any kind, 16 effluent exceedances, latest April 30, 2025, largest 282% over the limit.
E. coli, MTEC-MF: 4 limits, 20 violations of any kind, 14 effluent exceedances, latest April 30, 2025, largest 99,999% over the limit.
Solids, total suspended: 4 limits, 35 violations of any kind, 6 effluent exceedances, latest April 30, 2025, largest 197% over the limit.
BOD, 5-day, percent removal: 1 limit, 6 violations of any kind, 3 effluent exceedances, latest April 30, 2020, largest 140% over the limit.
pH: 2 limits, 58 violations of any kind, 2 effluent exceedances, latest April 30, 2025.
Temperature, water deg. centigrade: 0 limits, 50 violations of any kind, 0 effluent exceedances.
Nitrogen, ammonia total [as N]: 0 limits, 20 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 0 limits, 18 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 0 limits, 18 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 0 limits, 18 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 0 limits, 17 violations of any kind, 0 effluent exceedances.
Flow rate: 0 limits, 8 violations of any kind, 0 effluent exceedances.
Flow rate: 2 limits, 6 violations of any kind, 0 effluent exceedances.
Oil & Grease: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Duration of discharge: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Coliform, fecal general: 0 limits, 3 violations of any kind, 0 effluent exceedances.
Oil and grease visual: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Oil and grease, hexane extr method: 0 limits, 1 violation of any kind, 0 effluent exceedances.
Solids, suspended percent removal: 0 limits, 1 violation of any kind, 0 effluent exceedances.

April 29, 2021: Management Practice Violations - Failure to Maintain Records (ST6).
April 29, 2021: Reporting Violations - Failure to Notify (ST6).
April 29, 2021: Monitoring Violations - Frequency of Sampling Violation (ST6).
April 29, 2021: Management Practice Violations - Failure to Conduct Inspections (ST6).

Montana holds 53 Publicly owned treatment works coverages of this permit type in EPA’s file; 44 were issued before MTG580012.

Coverages issued nearest MTG580012

January 17, 2018: TOWN OF TERRY WWTF, Terry, MTG580017, held by TOWN OF TERRY
January 17, 2018: PARK CITY COUNTY WASTEWATER TREATMENT FACILITY, Park City Division, MTG581007, held by PARK CITY WATER AND SEWER DISTRICT
January 17, 2018: CITY OF TOWNSEND WASTEWATER TREATMENT PLANT, Townsend, MTG581020, held by CITY OF TOWNSEND
January 17, 2018: TOWN OF EUREKA WWTP, Eureka, MTG581032, held by TOWN OF EUREKA
January 17, 2018: CITY OF TROY WASTEWATER TREATMENT FACILITY, Troy, MTG581038, held by CITY OF TROY
January 18, 2018: TOWN OF BROADUS WWTF, Broadus, MTG580015, held by TOWN OF BROADUS
January 18, 2018: MONTANA STATE HOSPITAL SEWAGE TREATMENT LAGOONS, Warm Springs, MTG581004, held by MONTANA STATE HOSPITAL
January 23, 2018: FROMBERG WASTEWATER TREATMENT FACILITY, Fromberg, MTG581033, held by TOWN OF FROMBERG
January 30, 2018: TOWN OF GERALDINE WWTF, Geraldine, MTG580016, held by TOWN OF GERALDINE
May 10, 2018: WINNETT WWTF, Winnett, MTG580041, held by TOWN OF WINNETT

TOWN OF SACO among its neighbors

EPA’s permit file holds 4 discharge permits in the Beaver Creek-Nelson South Canal subwatershed (HUC 100500140704), MTG580012 among them. Its county holds 40, 0 of them major permits; MTG580012 is a minor permit.

Other permits in the Beaver Creek-Nelson South Canal subwatershed (HUC 100500140704)

BNSF MILK RIVER SUBDIVISION LINE SEGMENT 0035 MP 320.65 TO MP 320.80, Ashland: MTR111078, minor permit, discharging to NELSON SOUTH NUMBER 9 CANAL, permit term to December 31, 2027
BNSF WEST SACO SUBGRADE STABILIZATION (MP 316.2 TO MP 319), Saco: MTR107054, minor permit, discharging to BEAVER, permit term to December 31, 2017
BRIDGE L36206000+05001 BRIDGE OVER BEAVER CREEK, Saco: MTR109608, minor permit, discharging to BEAVER CREEK, permit term to December 31, 2022

Identity

Facility as filed	TOWN OF SACO
Permittee as filed	TOWN OF SACO
NPDES ID	MTG580012
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	January 18, 2018
Expiration date	December 31, 2022
Address	Saco, MT 59261
Receiving water	BEAVER CREEK
Receiving water impaired	303(D) Listed
Subwatershed	Beaver Creek-Nelson South Canal (HUC 100500140704)
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

20Pollutants on file
9Under a numeric limit
20With a violation of any kind
5With 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, 5-day, 20 deg. C	6	43	16	April 30, 2025	282% over the limit
E. coli, MTEC-MF	4	20	14	April 30, 2025	99,999% over the limit
Solids, total suspended	4	35	6	April 30, 2025	197% over the limit
BOD, 5-day, percent removal	1	6	3	April 30, 2020	140% over the limit
pH	2	58	2	April 30, 2025
Temperature, water deg. centigrade	0	50	0
Nitrogen, ammonia total [as N]	0	20	0
Nitrogen, total [as N]	0	18	0
Nitrite + Nitrate total [as N]	0	18	0
Phosphorus, total [as P]	0	18	0
Nitrogen, Kjeldahl, total [as N]	0	17	0
Flow rate	0	8	0
Flow rate	2	6	0
Oil & Grease	1	4	0
Duration of discharge	1	4	0
Chlorine, total residual	0	4	0
Coliform, fecal general	0	3	0
Oil and grease visual	1	1	0
Oil and grease, hexane extr method	0	1	0
Solids, suspended percent removal	0	1	0

Inspections, violations and enforcement

4Single-event violations

Date	What EPA recorded	Agency
April 29, 2021	Management Practice Violations - Failure to Maintain Records	ST6
April 29, 2021	Reporting Violations - Failure to Notify	ST6
April 29, 2021	Monitoring Violations - Frequency of Sampling Violation	ST6
April 29, 2021	Management Practice Violations - Failure to Conduct Inspections	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES MTG580012.

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 MTG580012.

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

This public-records page covers Clean Water Act discharge permit NPDES MTG580012 held by TOWN OF SACO in Saco, MT, which discharges to Beaver Creek, a receiving water listed as impaired under 303(D). The figures listed are 9 pollutants with a numeric limit, 20 pollutants on file, 20 with a violation of any kind, and 5 with an effluent exceedance.