U.S. water systems

Montana Water Systems

Montana

1,261 community water systems on record — 803 active, 458 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Montana’s official records. Always confirm current status with Montana before making decisions based on this information.

Counties in Montana

Beaverhead County (13)Big Horn County (12)Blaine County (7)Broadwater County (5)Carbon County (14)Carter County (1)Cascade County (69)Chouteau County (12)Custer County (14)Daniels County (2)Dawson County (17)Deer Lodge County (9)Fallon County (4)Fergus County (16)Flathead County (198)Gallatin County (109)Garfield County (1)Glacier County (18)Golden Valley County (4)Granite County (2)Hill County (26)Jefferson County (22)Judith Basin County (4)Lake County (42)Lewis and Clark County (94)Liberty County (8)Lincoln County (49)Madison County (15)McCone County (2)Meagher County (3)Mineral County (15)Missoula County (135)Musselshell County (6)Park County (26)Petroleum County (1)Phillips County (11)Pondera County (13)Powder River County (2)Powell County (2)Ravalli County (38)Richland County (12)Roosevelt County (8)Rosebud County (12)Sanders County (21)Sheridan County (8)Silver Bow County (5)Stillwater County (11)Sweet Grass County (4)Teton County (9)Toole County (16)Treasure County (1)Valley County (16)Wheatland County (7)Wibaux County (1)Yellowstone County (86)

All community water systems in Montana

System name	Mailing city	Population served	Status
BILLINGS CITY OF	BILLINGS	114,000	Active
CAMP MUSTANG	CORWIN SPRINGS	75,816	Inactive
MISSOULA WATER	MISSOULA	68,200	Active
GREAT FALLS CITY OF	GREAT FALLS	60,000	Active
BOZEMAN CITY OF	BOZEMAN	56,000	Active
BUTTE SILVERBOW WATER DEPT	BUTTE	33,000	Active
HELENA WATER SYSTEM	HELENA	32,091	Active
KALISPELL PUBLIC WORKS	KALISPELL	25,000	Active
BILLINGS HEIGHTS CO WATER DIST OF	BILLINGS	12,000	Active
BELGRADE CITY OF	BELGRADE	10,460	Active
WHITEFISH CITY OF	WHITEFISH	10,418	Active
HAVRE CITY OF	HAVRE	9,921	Active
WEST YELLOWSTONE TOWN OF	WEST YELLOWSTONE	9,899	Active
MILES CITY CITY OF	MILES CITY	9,565	Active
MALMSTROM AIR FORCE BASE	MALMSTROM AIR FORCE BASE	8,850	Active
FLATHEAD COUNTY WATER AND SEWER	KALISPELL	7,775	Active
LIVINGSTON CITY OF	LIVINGSTON	7,500	Active
ANACONDA WATER DEPARTMENT	ANACONDA	6,750	Active
LAUREL MUNICIPAL WATER SYSTEM	LAUREL	6,339	Active
BIGFORK COUNTY WATER AND SEWER	BIGFORK	6,100	Active
LEWISTOWN CITY OF	LEWISTOWN	5,923	Active
LOCKWOOD WATER AND SEWER DISTRICT	BILLINGS	5,900	Active
HAMILTON CITY OF	HAMILTON	5,660	Active
POLSON CITY OF	POLSON	5,300	Active
SIDNEY CITY OF	SIDNEY	5,000	Active
LIBBY CITY OF	LIBBY	4,892	Active
GLENDIVE CITY OF	GLENDIVE	4,873	Active
BROWNING TOWN OF	BROWNING	4,773	Inactive
COLUMBIA FALLS CITY OF	COLUMBIA FALLS	4,450	Active
NORTH STAR ZOOT WATER	BOZEMAN	4,323	Active
DILLON CITY OF	DILLON	4,300	Active
RIVER ROCK COUNTY WATER AND SEWER DIST	BELGRADE	4,200	Active
BIG SKY COUNTY WATER AND SEWER DIST 363	BIG SKY	4,132	Active
VALLEY WATER COMPANY	HAMILTON	4,000	Inactive
SHELBY CITY OF	SHELBY	3,970	Active
GLASGOW WATER CONDITIONING	GLASGOW	3,500	Inactive
HARDIN CITY OF	HARDIN	3,500	Active
LOLO WATER AND SEWER DIST	LOLO	3,315	Active
GLASGOW CITY OF	GLASGOW	3,253	Active
CUT BANK CITY OF	CUT BANK	3,105	Active
BIG SKY DRINKING WATER INC	CORVALLIS	3,025	Inactive
DRY PRAIRIE RURAL WATER AUTHORITY	CULBERTSON	3,005	Active
POPLAR CITY OF	POPLAR	2,926	Inactive
DEER LODGE CITY OF	DEER LODGE	2,900	Active
MEADOW VILLAGE BIG SKY	BIG SKY	2,756	Inactive
CLARK FORK WATER SYSTEM MWC	MISSOULA	2,500	Inactive
CONRAD WATER DEPT	CONRAD	2,500	Active
CONSOLIDATED CHEYENNE US	LAME DEER	2,500	Inactive
RONAN CITY OF	RONAN	2,483	Active
BIG MOUNTAIN WATER COMPANY	WHITEFISH	2,435	Active
COLSTRIP CITY OF	COLSTRIP	2,350	Active
RAE WATER AND SEWER DIST 313	BOZEMAN	2,325	Active
FORSYTH CITY OF	FORSYTH	2,260	Active
ROCKER WATER AND SEWER DISTRICT	ROCKER	2,250	Inactive
WELBORN AQUA HAUL	BELGRADE	2,246	Inactive
PABLO LAKE COUNTY WATER AND SEWER DIST	PABLO	2,175	Active
EAST HELENA CITY OF	EAST HELENA	2,114	Active
MONTANA STATE PRISON	DEER LODGE	2,100	Active
TROY CITY OF	TROY	2,100	Active
STEVENSVILLE TOWN OF	STEVENSVILLE	2,090	Active
EASTGATE VILLAGE SEWER AND WATER	EAST HELENA	2,000	Active
RED LODGE WATER DEPT	RED LODGE	2,000	Active
TOWNSEND CITY OF	TOWNSEND	2,000	Active
EUREKA TOWN OF	EUREKA	1,995	Active
FAIRMONT HOT SPRINGS RESORT	ANACONDA	1,965	Active
THOMPSON FALLS CITY OF	THOMPSON FALLS	1,950	Active
COLUMBUS TOWN OF	COLUMBUS	1,900	Active
ROUNDUP WATER DEPARTMENT	ROUNDUP	1,900	Active
THREE FORKS CITY OF	THREE FORKS	1,900	Active
BAKER CITY OF	BAKER	1,858	Active
MALTA CITY OF	MALTA	1,800	Active
MANHATTAN TOWN OF	MANHATTAN	1,800	Active
SUN PRAIRIE VILLAGE COUNTY	GREAT FALLS	1,800	Active
HILL COUNTY WATER DISTRICTS	HINGHAM	1,720	Active
PLAINS TOWN OF	PLAINS	1,700	Active
PLENTYWOOD WATER DEPARTMENT	PLENTYWOOD	1,700	Active
CHOTEAU CITY OF	CHOTEAU	1,691	Active
BIG TIMBER CITY OF	BIG TIMBER	1,650	Active
SEELEY LAKE WATER DISTRICT	SEELEY LAKE	1,575	Active
FORT BENTON CITY OF	FORT BENTON	1,500	Active
VIRGINIA CITY WATER DEPT	VIRGINIA CITY	1,500	Active
WHITEHALL TOWN OF	WHITEHALL	1,500	Active
YELLOWSTONE ICE AND WATER	BILLINGS	1,500	Inactive
BOULDER CITY OF	BOULDER	1,400	Active
ENNIS TOWN OF	ENNIS	1,400	Active
WORDEN COMMUNITY WUA	WORDEN	1,400	Inactive
PHILIPSBURG TOWN OF	PHILIPSBURG	1,360	Active
EL MAR ESTATES MSLA CO WATER	MISSOULA	1,350	Active
CHINOOK CITY OF	CHINOOK	1,300	Active
VA MEDICAL CENTER HELENA	FORT HARRISON	1,275	Active
BLACK EAGLE CASCADE COUNTY WATER SEWER	BLACK EAGLE	1,233	Active
LAKESIDE WATER SYSTEM	LAKESIDE	1,225	Active
CROW AGENCY WATER PLANT	CROW AGENCY	1,200	Inactive
FOREST PARK WATER RSID 24	GLENDIVE	1,200	Active
HELENA LEISURE LLC	HELENA	1,200	Active
HUNGRY HORSE CO WATER AND SEWER DISTRICT	HUNGRY HORSE	1,135	Active
EAST MISSOULA MT WATER MWC	MISSOULA	1,125	Inactive
ABSAROKEE WATER AND SEWER DIST	ABSAROKEE	1,100	Active
CMRWA MUSSELSHELL JUDITH RURAL WATER SYS	ROUNDUP	1,100	Active
SUPERIOR TOWN OF	SUPERIOR	1,100	Active
HARLOWTON CITY OF	HARLOWTON	1,050	Active
ST MARY HEADQUARTERS AND CG	WEST GLACIER	1,030	Active
SCOBEY CITY OF	SCOBEY	1,026	Active
FAIRVIEW TOWN OF	FAIRVIEW	1,000	Active
PRAIRIE WATER COMPANY	GREAT FALLS	1,000	Active
WHITE SULPHUR SPRINGS CITY OF	WHITE SULPHUR SPRINGS	1,000	Active
MEADOW LAKE CO WATER AND SEWER DISTRICT	COLUMBIA FALLS	950	Active
WESTVIEW MOBILE HOME PARK	MISSOULA	947	Active
BOGUSTWO MEDICINE WATER SYSTEM 083090090	—	900	Inactive
EAST GLACIER CO WATER AND SEWER DIST	EAST GLACIER	900	Inactive
PIONEER WATER SERVICE	BILLINGS	900	Active
CHESTER TOWN OF	CHESTER	870	Active
DARBY TOWN OF	DARBY	850	Active
MISSOULA WATER WORKS LTD PTR	SCOTTSDALE	835	Inactive
VALLEY GROVE SUBDIVISION	BELGRADE	825	Active
HARLEM CITY OF	HARLEM	820	Active
PHANTOM HILLS WATER SYSTEM	MISSOULA	810	Active
ESTATES AT YELLOWSTONE LLC	BOCA RATON	800	Active
PINESDALE TOWN OF	PINESDALE	800	Active
WORDEN BALLANTINE YELLOWSTONE	BALLANTINE	800	Active
JEFFERSON HILLS WUA	HELENA	780	Active
GOLDEN MEADOWS SUBDIVISION	OREM	772	Active
SOMERS CO WATER AND SEWER DIST	SOMERS	765	Active
BRIDGER TOWN OF	BRIDGER	750	Active
FISHER WATER SERVICE	BILLINGS	750	Active
FORT BELKNAP INDIAN AGENCY	HARLEM	750	Inactive
LANDMARK SUBDIVISION	BOZEMAN	750	Active
TEN MILE AND PLEASANT VALLEY WUA	HELENA	750	Active
TIBER COUNTY WATER DISTRICT	BRADY	750	Active
MONTANA STATE HOSPITAL COMPLEX	WARM SPRINGS	721	Active
FAIRFIELD TOWN OF	FAIRFIELD	718	Active
NORTH STAR PUD	HELENA	715	Active
CULBERTSON TOWN OF	CULBERTSON	714	Active
TRAVOIS VILLAGE MOBILE PARK	MISSOULA	702	Active
GARDINER PARK CO WATER DIST	GARDINER	700	Active
ST IGNATIUS TOWN OF	ST IGNATIUS	700	Active
WOODS BAY WATER AND SEWER DISTRICT	BIGFORK	685	Active
ELK GROVE WATER	BOZEMAN	672	Active
GENESIS BUSINESS PARK	GALLATIN GATEWAY	670	Active
FORT PECK RURAL COUNTY WATER DISTRICT	FT. PECK	663	Active
CASCADE TOWN OF	CASCADE	650	Active
HILLSIDE VILLAGE	DALLAS	650	Active
ST LABRE INDIAN SCHOOL	ASHLAND	650	Active
CIRCLE TOWN OF	CIRCLE	644	Active
PABLO WATER DISTRICT	PABLO	640	Inactive
SHERIDAN TOWN OF	SHERIDAN	632	Active
GREENFIELD MOBILE HOME PARK	MISSOULA	620	Active
BIG SANDY TOWN OF	BIG SANDY	608	Active
BELT TOWN OF	BELT	600	Active
CEDAR PARK WATER PLANT	BILLINGS	600	Inactive
CHERRY CREEK ESTATES LLC	BILLINGS	600	Active
COUNTRYSIDE VILLAGE MHP GRT FLS	OREM	600	Active
HOT SPRINGS MUNICIPAL WATER	HOT SPRINGS	600	Active
JOLIET TOWN OF	JOLIET	600	Active
MEDICINE LAKE TOWN OF	MEDICINE LAKE	600	Active
PTARMIGAN VILLAGE INC	WHITEFISH	600	Active
VAUGHN CASCADE COUNTY WATER AND SEWER	VAUGHN	585	Active
WIBAUX TOWN OF	WIBUAX	550	Active
WINDSOR ESTATES	LINCOLN	530	Active
TWO BUTTES WATER USERS ASSN	FORT SHAW	525	Active
WYE AREA WATER SYSTEM	MISSOULA	512	Active
CAMP CREEK CAMPGROUND - BLM	LEWISTOWN	500	Inactive
COVERED WAGON MB HM PARK	LINCOLN	500	Active
GORE HILL COUNTY WATER DIST	GREAT FALLS	500	Active
HEADQUARTERS APGAR	WEST GLACIER	500	Active
HIGHLAND PARK UTILITIES ASSN	GLENDIVE	500	Active
HOMESTEAD ACRES COUNTY WATER AND SEWER	GREAT FALLS	500	Active
LINDA VISTA WATER COMPANY	MISSOULA	500	Inactive
MT STATE HOSPITAL WARM SPRINGS	WARM SPRINGS	500	Inactive
RUDYARD WATER USERS	HINGHAM	500	Inactive
W YELLOWSTONE MT SPRING WATER	WEST YELLOWSTONE	500	Inactive
MISSOULA KOA & EL MAR TLR VILLAGE	BEND	499	Active
FROMBERG TOWN OF	FROMBERG	498	Active
ALBERTON TOWN OF	ALBERTON	495	Active
COUNTRY ESTATES WATER SUPPLY	KALISPELL	490	Active
MCHUGH MOBILE HOME PARK	VANCOUVER	490	Active
TREASURE STATE ACRES WUA	HELENA	483	Active
CUSTER CO WATER AND SEWER DIST	MILES CITY	480	Active
LODGE GRASS TOWN OF	LODGE GRASS	480	Active
CUT BANK NORTH WATER DISTRICT	CUT BANK	478	Active
FLATHEAD CO WATER DISTRICT NO 8	COLUMBIA FALLS	475	Active
PRYOR CREEK WATER ASSN	HUNTLEY	475	Active
TRI COUNTY WATER DISTRICT	POWER	470	Active
SUNBURST TOWN OF	SUNBURST	459	Active
INDIAN SPRINGS RANCH SUB	EUREKA	455	Active
VALIER TOWN OF	VALIER	452	Active
ANDESITE RIDGE WATER SYSTEM	BIG SKY	450	Active
BAXTER CREEK NO 2 HOA	BELGRADE	450	Active
BROADUS TOWN OF	BROADUS	450	Active
CONSOLIDATED CHARLO LAKE CO W AND S DIST	CHARLO	450	Active
CORAM COUNTY WATER AND SEWER DISTRICT	CORAM	450	Active
FORT SMITH WATER AND SEWER DISTRICT	WORDEN	450	Active
FROID TOWN OF	FROID	450	Active
GREENACRES COUNTY WATER AND SEWER DIST	KALISPELL	450	Active
NORTH VALLEY COUNTY WATER AND SEWER DIST	GLASGOW	450	Active
DRY PRAIRIE VALLEY COUNTY	CULBERTSON	440	Inactive
WILDERNESS CLUB THE	EUREKA	440	Active
BUSHARD WATER COMPANY	BLACK EAGLE	425	Active
STANFORD TOWN OF	STANFORD	425	Active
TWIN BRIDGES TOWN OF	TWIN BRIDGES	424	Active

Showing the 200 largest of 1,261 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.