Clean Water Act discharge permit · NPDES MT0030473

CITY OF CHINOOK WTP, Chinook, MT: NPDES MT0030473 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
5Pollutants under a numeric limit
0Pollutants with an effluent exceedance

CITY OF CHINOOK WTP, held by CITY OF CHINOOK, holds NPDES permit MT0030473, which discharges to Milk River. EPA’s file records it issued October 31, 2014 and expiring November 30, 2019. 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	CITY OF CHINOOK WTP
Permittee as filed	CITY OF CHINOOK
NPDES ID	MT0030473
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	October 31, 2014
Expiration date	November 30, 2019
Address	Chinook, MT 59523
Receiving water	MILK RIVER
Receiving water impaired	303(D) Listed
SIC	4941 – Water Supply

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

7Pollutants on file
5Under a numeric limit
4With a violation of any kind
0With 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
Turbidity	0	7
Chlorine, total residual	2	2
Flow, in conduit or thru treatment plant	0	2
Aluminum, dissolved [as Al]	2	1
Flow rate	2	0
pH	2	0
Solids, total suspended	2	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0030473.

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 MT0030473.

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, MT0030473.

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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 MT0030473 there.

Nearby on the register

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

The page is an EPA-sourced public-records entry for CITY OF CHINOOK WTP, Chinook, MT, under NPDES permit MT0030473, an individual, effective, minor-discharger permit for a publicly owned treatment works that discharges to MILK RIVER. The permit's file dates are as loaded on October 14, 2026, showing issuance on October 31, 2014 and expiration on November 30, 2019, and the effluent figures list 7 pollutants on file, 5 under a numeric limit, 4 with a violation of any kind, and 0 with an effluent exceedance.