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MT tap water quality, city by city
218 cities and towns in MT are served by an active community water system in the EPA's records. Each page below translates that system's EPA-reported history into plain English.
According to EPA SDWIS data, retrieved June 2026.
- Absarokee
- Alberton
- Alder
- Anaconda
- Antelope
- Ashland
- Augusta
- Bainville
- Baker
- Ballantine
- Basin
- Belfry
- Belgrade
- Belt
- Big Sandy
- Big Sky
- Big Timber
- Bigfork
- Billings
- Black Eagle
- Bonner
- Boulder
- Box Elder
- Bozeman
- Brady
- Bridger
- Broadus
- Broadview
- Browning
- Butte
- Bynum
- Carter
- Cascade
- Charlo
- Chester
- Chinook
- Choteau
- Circle
- Clancy
- Clyde Park
- Colstrip
- Columbia Falls
- Columbus
- Conrad
- Cooke City
- Coram
- Corvallis
- Crow Agency
- Culbertson
- Cut Bank
- Darby
- Deer Lodge
- Denton
- Dillon
- Dodson
- Drummond
- Dutton
- E Helena
- East Helena
- Ekalaka
- Emigrant
- Ennis
- Ethridge
- Eureka
- Fairfield
- Fairview
- Flaxville
- Florence
- Forsyth
- Fort Benton
- Fort Harrison
- Fort Peck
- Fort Shaw
- Fortine
- Frenchtown
- Froid
- Fromberg
- Ft. Peck
- Galata
- Gallatin Gateway
- Gardiner
- Geraldine
- Geyser
- Gildford
- Glasgow
- Glendive
- Grass Range
- Great Falls
- Greycliff
- Hamilton
- Hardin
- Harlem
- Harlowton
- Haugan
- Havre
- Heart Butte
- Helena
- Heron
- Highwood
- Hingham
- Hinsdale
- Hobson
- Hot Springs
- Hungry Horse
- Huntley
- Huson
- Hysham
- Jackson
- Joliet
- Jordan
- Judith Gap
- Kalispell
- Kevin
- Lakeside
- Lambert
- Lame Deer
- Laurel
- Ledger
- Lewistown
- Libby
- Lima
- Lincoln
- Livingston
- Lodge Grass
- Lolo
- Loma
- Loring
- Malmstrom Air Force Base
- Malta
- Manhattan
- Manhattan Mt
- Martin City
- Martinsdale
- Medicine Lake
- Melstone
- Melville
- Miles City
- Missoula
- Moore
- Musselshell
- Nashua
- Neihart
- Noxon
- Opheim
- Outlook
- Pablo
- Paradise
- Pendroy
- Philipsburg
- Pinesdale
- Plains
- Plentywood
- Plevna
- Polson
- Poplar
- Potomac
- Power
- Pray
- Ramsay
- Rapelje
- Red Lodge
- Rexford
- Richey
- Roberts
- Rollins
- Ronan
- Roundup
- Roy
- Rudyard
- Ryegate
- Saco
- Sand Coulee
- Scobey
- Seeley Lake
- Shelby
- Shepherd
- Sheridan
- Sidney
- Somers
- St Ignatius
- St Regis
- Stanford
- Stevensville
- Stockett
- Sun River
- Sunburst
- Superior
- Sweet Grass
- Thoimpson Falls
- Thompson Falls
- Three Forks
- Townsend
- Trego
- Trout Creek
- Troy
- Turner
- Twin Bridges
- Two Dot
- Ulm
- Valier
- Vaughn
- Virginia City
- Warm Springs
- West Glacier
- West Yellowstone
- Westby
- White Sulphur Springs
- Whitefish
- Whitehall
- Wibuax
- Wilsall
- Winifred
- Winnett
- Wolf Creek
- Wolf Point
- Worden
- Yellowtail
- Zortman