Clean Water Act discharge permit · NPDES MT0021849

SIDNEY WASTEWATER TREATMENT FACILITY, Sidney, MT: NPDES MT0021849 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
18Pollutants under a numeric limit
4Pollutants with an effluent exceedance

SIDNEY WASTEWATER TREATMENT FACILITY, held by CITY OF SIDNEY MT, holds NPDES permit MT0021849, which discharges to Yellowstone River. EPA’s file records it issued January 11, 2014 and expiring February 28, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	SIDNEY WASTEWATER TREATMENT FACILITY
Permittee as filed	CITY OF SIDNEY MT
NPDES ID	MT0021849
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	January 11, 2014
Expiration date	February 28, 2019
Address	Sidney, MT 59270
Receiving water	YELLOWSTONE RIVER
Subwatershed	City of Sidney-Yellowstone River (HUC 101000042704)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

18Pollutants on file
18Under a numeric limit
9With 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	5	11	10	September 30, 2014	110% over the limit
BOD, 5-day, 20 deg. C	5	10	10	May 31, 2014	917% over the limit
BOD, 5-day, percent removal	1	6	6	September 30, 2014	567% over the limit
Solids, suspended percent removal	1	4	4	September 30, 2014	220% over the limit
Oil and grease, hexane extr method	1	1	0
Lead, total recoverable	1	1	0
Chromium, total recoverable	1	1	0
Copper, total recoverable	1	1	0
Solids, total dissolved [TDS]	1	1	0
Flow rate	2	0	0
pH	2	0	0
Nitrogen, total [as N]	2	0	0
Phosphorus, total [as P]	2	0	0
Report due [yrmoda]	2	0	0
Nitrogen, ammonia total [as N]	1	0	0
Nitrogen, Kjeldahl, total [as N]	1	0	0
Nitrite + Nitrate total [as N]	1	0	0
E. coli, MTEC-MF	1	0	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0021849.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MT0021849.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MT0021849 there.

Nearby on the register

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

This public-records page covers the NPDES MT0021849 discharge permit for the Sidney Wastewater Treatment Facility in Sidney, MT, held by the City of Sidney MT and discharging to the Yellowstone River, with the permit listed as administratively continued. The page lists 18 pollutants on file, 4 of which are under a numeric limit and 4 of which show an effluent exceedance, within the City of Sidney-Yellowstone River watershed (HUC 101000042704).