Clean Water Act discharge permit · NPDES MT0020451

RYEGATE WWTP, Ryegate, MT: NPDES MT0020451 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
14Pollutants under a numeric limit
2Pollutants with an effluent exceedance

RYEGATE WWTP, held by TOWN OF RYEGATE, holds NPDES permit MT0020451, which discharges to Musselshell R. Via Unnamed Slough. EPA’s file records it issued November 1, 2009 and expiring October 31, 2014. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	RYEGATE WWTP
Permittee as filed	TOWN OF RYEGATE
NPDES ID	MT0020451
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, 2009
Expiration date	October 31, 2014
Issuing agency	MONTANA DEQ
Address	Ryegate, MT 59074
Receiving water	MUSSELSHELL R. VIA UNNAMED SLOUGH
Subwatershed	Musselshell River-Careless Creek (HUC 100402011007)
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

17Pollutants on file
14Under a numeric limit
17With a violation of any kind
2With 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	24	2	July 31, 2020	55% over the limit
BOD, 5-day, 20 deg. C	5	23	1	July 31, 2020	7% over the limit
Nitrogen, total [as N]	2	23	0
Phosphorus, total [as P]	2	23	0
Nitrogen, ammonia total [as N]	1	21	0
Nitrogen, Kjeldahl, total [as N]	1	21	0
Nitrite + Nitrate total [as N]	1	21	0
Flow rate	0	14	0
Coliform, fecal general	0	11	0
E. coli, MTEC-MF	4	4	0
Flow rate	2	4	0
Chlorine, total residual	2	4	0
Temperature, water deg. centigrade	1	4	0
pH	2	2	0
BOD, 5-day, percent removal	1	2	0
Solids, suspended percent removal	1	2	0
Oil & Grease	0	1	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 MT0020451.

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

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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 MT0020451 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES MT0020451 for the RYEGATE WWTP in Ryegate, MT, held by TOWN OF RYEGATE and administratively continued, with a Minor discharger class and 14 pollutants under a numeric limit, of which 2 had an effluent exceedance. The permit was issued November 1, 2009 and expired October 31, 2014, and its status reflects EPA's permit file as loaded on October 14, 2026.