4,728 water systems tracked in Montana, serving 1,277,714 people. 26 systems exceed EPA's 4 ppt limit for PFOA or PFOS and must be treating for PFAS by April 2029.
Montana follows federal EPA MCLs (PFOA/PFOS: 4 ppt).
MT follows federal EPA MCLs. PFAS investigation at Malmstrom AFB and other sites.
Montana follows federal EPA MCLs. Contamination investigation at Malmstrom AFB and fire training areas.
Free check against EPA UCMR5 data for PFOA and PFOS above the 4 ppt limit, plus weekly Montana MCL, deadline, and funding alerts.
Firms with PFAS-related federal awards routed to Montana (USASpending). See the national top 50 →
| Rank | Recipient | Total awarded | # awards |
|---|---|---|---|
| 1 | MONTANA DEPARTMENT OF ENVIRONMENTAL QUALITY | $36,011,000 | 2 |
| 2 | GS ENVIRONMENTAL, INC. | $66,000 | 1 |
| System | City | Population | PFOA (ppt) | PFOS (ppt) | Status |
|---|---|---|---|---|---|
| BILLINGS CITY OF MT0000153 | BILLINGS | 114,000 | — | — | Compliant |
| CAMP MUSTANG MT0003181 | CORWIN SPRINGS | 75,816 | — | — | Compliant |
| MISSOULA WATER MT0000294 | MISSOULA | 68,200 | — | — | Compliant |
| GREAT FALLS CITY OF MT0000525 | GREAT FALLS | 60,000 | — | — | Compliant |
| BOZEMAN CITY OF MT0000161 | BOZEMAN | 56,000 | — | — | Compliant |
| BUTTE SILVERBOW WATER DEPT MT0000170 | BUTTE | 33,000 | — | — | Compliant |
| HELENA WATER SYSTEM MT0000241 | HELENA | 32,091 | — | — | Compliant |
| KALISPELL PUBLIC WORKS |
| KALISPELL |
| 25,000 |
| — |
| 6.6 |
| Exceeds |
| MONTANA STATE UNIVERSITY BOZEMAN MT0004790 | BOZEMAN | 19,200 | — | — | Compliant |
| UNIVERSITY OF MONTANA MT0004204 | MISSOULA | 15,000 | — | — | Compliant |
| BILLINGS HEIGHTS CO WATER DIST OF MT0000155 | BILLINGS | 12,000 | — | — | Compliant |
| BELGRADE CITY OF MT0000136 | BELGRADE | 10,460 | — | — | Compliant |
| WHITEFISH CITY OF MT0000357 | WHITEFISH | 10,418 | — | — | Compliant |
| HAVRE CITY OF MT0000524 | HAVRE | 9,921 | — | — | Compliant |
| WEST YELLOWSTONE TOWN OF MT0003136 | WEST YELLOWSTONE | 9,899 | — | — | Compliant |
| MILES CITY CITY OF MT0000291 | MILES CITY | 9,565 | — | — | Compliant |
| MALMSTROM AIR FORCE BASE MT0000515 | MALMSTROM AIR FORCE BASE | 8,850 | — | — | Compliant |
| FLATHEAD COUNTY WATER AND SEWER MT0001744 | KALISPELL | 7,775 | — | — | Compliant |
| LIVINGSTON CITY OF MT0000573 | LIVINGSTON | 7,500 | — | — | Compliant |
| ANACONDA WATER DEPARTMENT MT0000016 | ANACONDA | 6,750 | — | — | Compliant |
| LAUREL MUNICIPAL WATER SYSTEM MT0000270 | LAUREL | 6,339 | — | — | Compliant |
| BIGFORK COUNTY WATER AND SEWER MT0000262 | BIGFORK | 6,100 | — | — | Compliant |
| LEWISTOWN CITY OF MT0000271 | LEWISTOWN | 5,923 | — | — | Compliant |
| LOCKWOOD WATER AND SEWER DISTRICT MT0000156 | BILLINGS | 5,900 | — | — | Compliant |
| ROCKY MOUNTAIN COLLEGE MT0004796 | BILLINGS | 5,700 | — | — | Compliant |
| HAMILTON CITY OF MT0000234 | HAMILTON | 5,660 | — | — | Compliant |
| POLSON CITY OF MT0000308 | POLSON | 5,300 | — | — | Compliant |
| SIDNEY CITY OF MT0000330 | SIDNEY | 5,000 | — | — | Compliant |
| LIBBY CITY OF MT0000274 | LIBBY | 4,892 | — | — | Compliant |
| GLENDIVE CITY OF MT0000229 | GLENDIVE | 4,873 | — | — | Compliant |
| BROWNING TOWN OF MT0000169 | BROWNING | 4,773 | — | — | Compliant |
| TOWN OF BROWNING 083090091 | BROWNING | 4,671 | — | — | Compliant |
| COLUMBIA FALLS CITY OF MT0000181 | COLUMBIA FALLS | 4,450 | — | — | Compliant |
| NORTH STAR ZOOT WATER MT0004284 | BOZEMAN | 4,323 | — | — | Compliant |
| DILLON CITY OF MT0000201 | DILLON | 4,300 | — | — | Compliant |
| RIVER ROCK COUNTY WATER AND SEWER DIST MT0004082 | BELGRADE | 4,200 | — | — | Compliant |
| BIG SKY COUNTY WATER AND SEWER DIST 363 MT0002385 | BIG SKY | 4,132 | — | — | Compliant |
| VALLEY WATER COMPANY MT0001577 | HAMILTON | 4,000 | — | — | Compliant |
| SHELBY CITY OF MT0000328 | SHELBY | 3,970 | — | — | Compliant |
| GLASGOW WATER CONDITIONING MT0003401 | GLASGOW | 3,500 | — | — | Compliant |
| HARDIN CITY OF MT0000235 | HARDIN | 3,500 | — | — | Compliant |
| LOLO WATER AND SEWER DIST MT0000278 | LOLO | 3,315 | — | — | Compliant |
| GLASGOW CITY OF MT0000415 | GLASGOW | 3,253 | — | — | Compliant |
| BIG SKY DRINKING WATER INC MT0003371 | CORVALLIS | 3,025 | — | — | Compliant |
| POPLAR, CITY OF 083090051 | POPLAR | 3,025 | — | — | Compliant |
| DRY PRAIRIE RURAL WATER AUTHORITY MT0004348 | CULBERTSON | 3,005 | — | — | Compliant |
| WOLF POINT CITY OF 083090058 | WOLF POINT | 3,000 | — | — | Compliant |
| MONTANA STATE UNIVERSITY BILLINGS MT0004788 | BILLINGS | 2,999 | — | — | Compliant |
| POPLAR CITY OF MT0000310 | POPLAR | 2,926 | — | — | Compliant |
| DEER LODGE CITY OF MT0000197 | DEER LODGE | 2,900 | — | — | Compliant |
| MEADOW VILLAGE BIG SKY MT0002384 | BIG SKY | 2,756 | — | — | Compliant |
| LAME DEER WATER SYSTEM 083090064 | LAME DEER | 2,605 | — | — | Compliant |
| FORT BELKNAP AGENCY WATER SYSTEM 083090041 | HARLEM | 2,600 | — | — | Compliant |
| CONSOLIDATED CHEYENNE US MT0000008 | LAME DEER | 2,500 | — | — | Compliant |
| CONRAD WATER DEPT MT0000186 | CONRAD | 2,500 | — | — | Compliant |
| RONAN CITY OF MT0000318 | RONAN | 2,483 | — | — | Compliant |
| BIG MOUNTAIN WATER COMPANY MT0000060 | WHITEFISH | 2,435 | — | — | Compliant |
| COLSTRIP CITY OF MT0000180 | COLSTRIP | 2,350 | — | — | Compliant |
| RAE WATER AND SEWER DIST 313 MT0000628 | BOZEMAN | 2,325 | — | — | Compliant |
| FORSYTH CITY OF MT0000215 | FORSYTH | 2,260 | — | — | Compliant |
| ROCKER WATER AND SEWER DISTRICT MT0003478 | ROCKER | 2,250 | — | — | Compliant |
| WELBORN AQUA HAUL MT0005114 | BELGRADE | 2,246 | — | — | Compliant |
| PABLO LAKE COUNTY WATER AND SEWER DIST MT0001917 | PABLO | 2,175 | — | — | Compliant |
| EAST HELENA CITY OF MT0000196 | EAST HELENA | 2,114 | — | — | Compliant |
| MONTANA STATE PRISON MT0000198 | DEER LODGE | 2,100 | — | — | Compliant |
| TROY CITY OF MT0000348 | TROY | 2,100 | — | — | Compliant |
| STEVENSVILLE TOWN OF MT0000335 | STEVENSVILLE | 2,090 | — | — | Compliant |
| CROW AGENCY WATER SYSTEM 083090011 | CROW AGENCY | 2,057 | — | — | Compliant |
| RED LODGE WATER DEPT MT0000314 | RED LODGE | 2,000 | — | — | Compliant |
| EASTGATE VILLAGE SEWER AND WATER MT0001784 | EAST HELENA | 2,000 | — | — | Compliant |
| TOWNSEND CITY OF MT0000344 | TOWNSEND | 2,000 | — | — | Compliant |
| ROCKY BOY'S RURAL WATER 083090075 | BOX ELDER | 2,000 | — | — | Compliant |
| EUREKA TOWN OF MT0000210 | EUREKA | 1,995 | — | — | Compliant |
| FAIRMONT HOT SPRINGS RESORT MT0000589 | ANACONDA | 1,965 | — | — | Compliant |
| THREE FORKS CITY OF MT0000343 | THREE FORKS | 1,900 | — | — | Compliant |
| COLUMBUS TOWN OF MT0000185 | COLUMBUS | 1,900 | — | — | Compliant |
| ROUNDUP WATER DEPARTMENT MT0000321 | ROUNDUP | 1,900 | — | — | Compliant |
| BAKER CITY OF MT0000021 | BAKER | 1,858 | — | — | Compliant |
| SUN PRAIRIE VILLAGE COUNTY MT0000521 | GREAT FALLS | 1,800 | — | — | Compliant |
| MANHATTAN TOWN OF MT0000285 | MANHATTAN | 1,800 | — | — | Compliant |
| MALTA CITY OF MT0000284 | MALTA | 1,800 | — | — | Compliant |
| ASSINIBOINE & SIOUX RURAL WATER SYSTEM 083090050 | POPLAR | 1,726 | — | — | Compliant |
| HILL COUNTY WATER DISTRICTS MT0000249 | HINGHAM | 1,720 | — | — | Compliant |
| PLAINS TOWN OF MT0000305 | PLAINS | 1,700 | — | — | Compliant |
| PLENTYWOOD WATER DEPARTMENT MT0000306 | PLENTYWOOD | 1,700 | — | — | Compliant |
| CHOTEAU CITY OF MT0000175 | CHOTEAU | 1,691 | — | — | Compliant |
| BIG TIMBER CITY OF MT0000463 | BIG TIMBER | 1,650 | — | — | Compliant |
| SEELEY LAKE WATER DISTRICT MT0000327 | SEELEY LAKE | 1,575 | — | — | Compliant |
| TWO MEDICINE WATER - EAST GLACIER 083090090 | BROWNING | 1,504 | — | — | Compliant |
| YELLOWSTONE ICE AND WATER MT0003429 | BILLINGS | 1,500 | — | — | Compliant |
| VIRGINIA CITY WATER DEPT MT0000353 | VIRGINIA CITY | 1,500 | — | — | Compliant |
| WHITEHALL TOWN OF MT0000359 | WHITEHALL | 1,500 | — | — | Compliant |
| FORT BENTON CITY OF MT0000216 | FORT BENTON | 1,500 | — | — | Compliant |
| ROCKY BOY AGENCY WATER SYSTEM 083090079 | BOX ELDER | 1,442 | — | — | Compliant |
| WORDEN COMMUNITY WUA MT0000365 | WORDEN | 1,400 | — | — | Compliant |
| BOULDER CITY OF MT0000158 | BOULDER | 1,400 | — | — | Compliant |
| ENNIS TOWN OF MT0000208 | ENNIS | 1,400 | — | — | Compliant |
| PHILIPSBURG TOWN OF MT0000304 | PHILIPSBURG | 1,360 | — | — | Compliant |
| EL MAR ESTATES MSLA CO WATER MT0000517 | MISSOULA | 1,350 | — | — | Compliant |
| CHINOOK CITY OF MT0000174 | CHINOOK | 1,300 | — | — | Compliant |
| VA MEDICAL CENTER HELENA MT0000246 | FORT HARRISON | 1,275 | — | — | Compliant |
| BLACK EAGLE CASCADE COUNTY WATER SEWER MT0000157 | BLACK EAGLE | 1,233 | — | — | Compliant |
| LAKESIDE WATER SYSTEM MT0000266 | LAKESIDE | 1,225 | — | — | Compliant |
| CROW AGENCY WATER PLANT MT0000190 | CROW AGENCY | 1,200 | — | — | Compliant |
| FOREST PARK WATER RSID 24 MT0000233 | GLENDIVE | 1,200 | — | — | Compliant |
| HELENA LEISURE LLC MT0000590 | HELENA | 1,200 | — | — | Compliant |
| HUNGRY HORSE CO WATER AND SEWER DISTRICT MT0000253 | HUNGRY HORSE | 1,135 | — | — | Compliant |
| SUPERIOR TOWN OF MT0000339 | SUPERIOR | 1,100 | — | — | Compliant |
| ABSAROKEE WATER AND SEWER DIST MT0000003 | ABSAROKEE | 1,100 | — | — | Compliant |
| HARLOWTON CITY OF MT0000240 | HARLOWTON | 1,050 | — | — | Compliant |
| ST MARY HEADQUARTERS AND CG MT0002729 | WEST GLACIER | 1,030 | — | — | Compliant |
| SCOBEY CITY OF MT0000326 | SCOBEY | 1,026 | — | — | Compliant |
| WHITE SULPHUR SPRINGS CITY OF MT0000360 | WHITE SULPHUR SPRINGS | 1,000 | — | — | Compliant |
| PRAIRIE WATER COMPANY MT0003539 | GREAT FALLS | 1,000 | — | — | Compliant |
| FAIRVIEW TOWN OF MT0000213 | FAIRVIEW | 1,000 | — | — | Compliant |
| MEADOW LAKE CO WATER AND SEWER DISTRICT MT0000914 | COLUMBIA FALLS | 950 | — | — | Compliant |
| WESTVIEW MOBILE HOME PARK MT0000437 | MISSOULA | 947 | — | — | Compliant |
| EAST GLACIER CO WATER AND SEWER DIST MT0002887 | EAST GLACIER | 900 | — | — | Compliant |
| PIONEER WATER SERVICE MT0004226 | BILLINGS | 900 | — | — | Compliant |
| CULLIGAN WATER CONDITIONING GREAT FALLS MT0002630 | GREAT FALLS | 900 | — | — | Compliant |
| CHESTER TOWN OF MT0000173 | CHESTER | 870 | — | — | Compliant |
| DARBY TOWN OF MT0000195 | DARBY | 850 | — | — | Compliant |
| HAYS/WHITE COW CANYON WS 083090044 | HARLEM | 840 | — | — | Compliant |
| VALLEY GROVE SUBDIVISION MT0003780 | BELGRADE | 825 | — | — | Compliant |
| HARLEM CITY OF MT0000239 | HARLEM | 820 | — | — | Compliant |
| PHANTOM HILLS WATER SYSTEM MT0004379 | MISSOULA | 810 | — | — | Compliant |
| PINESDALE TOWN OF MT0002926 | PINESDALE | 800 | — | — | Compliant |
| WORDEN BALLANTINE YELLOWSTONE MT0000022 | BALLANTINE | 800 | — | — | Compliant |
| JEFFERSON HILLS WUA MT0002978 | HELENA | 780 | — | — | Compliant |
| SOMERS CO WATER AND SEWER DIST MT0000332 | SOMERS | 765 | — | — | Compliant |
| FISHER WATER SERVICE MT0001848 | BILLINGS | 750 | — | — | Compliant |
| FORT BELKNAP INDIAN AGENCY MT0000238 | HARLEM | 750 | — | — | Compliant |
| LANDMARK SUBDIVISION MT0004262 | BOZEMAN | 750 | — | — | Compliant |
| BRIDGER TOWN OF MT0000165 | BRIDGER | 750 | — | — | Compliant |
| TIBER COUNTY WATER DISTRICT MT0000400 | BRADY | 750 | — | — | Compliant |
| MONTANA STATE HOSPITAL COMPLEX MT0004805 | WARM SPRINGS | 721 | — | — | Compliant |
| FAIRFIELD TOWN OF MT0000212 | FAIRFIELD | 718 | — | — | Compliant |
| NORTH STAR PUD MT0004264 | HELENA | 715 | — | — | Compliant |
| CULBERTSON TOWN OF MT0000192 | CULBERTSON | 714 | — | — | Compliant |
| TRAVOIS VILLAGE MOBILE PARK MT0003909 | MISSOULA | 702 | — | — | Compliant |
| GARDINER PARK CO WATER DIST MT0000224 | GARDINER | 700 | — | — | Compliant |
| ST IGNATIUS TOWN OF MT0001740 | ST IGNATIUS | 700 | — | — | Compliant |
| WOODS BAY WATER AND SEWER DISTRICT MT0004698 | BIGFORK | 685 | — | — | Compliant |
| ELK GROVE WATER MT0004248 | BOZEMAN | 672 | — | — | Compliant |
| GENESIS BUSINESS PARK MT0004178 | GALLATIN GATEWAY | 670 | — | — | Compliant |
| FORT PECK RURAL COUNTY WATER DISTRICT MT0004177 | FT. PECK | 663 | — | — | Compliant |
| ST LABRE INDIAN SCHOOL MT0000018 | ASHLAND | 650 | — | — | Compliant |
| CASCADE TOWN OF MT0000171 | CASCADE | 650 | — | — | Compliant |
| BEDROCKBABB WATER SYSTEM 083090004 | BROWNING | 645 | — | — | Compliant |
| CIRCLE TOWN OF MT0000176 | CIRCLE | 644 | — | — | Compliant |
| SHERIDAN TOWN OF MT0000329 | SHERIDAN | 632 | — | — | Compliant |
| GREENFIELD MOBILE HOME PARK MT0000373 | MISSOULA | 620 | — | — | Compliant |
| BIG SANDY TOWN OF MT0000150 | BIG SANDY | 608 | — | — | Compliant |
| PTARMIGAN VILLAGE INC MT0000133 | WHITEFISH | 600 | — | — | Compliant |
| CEDAR PARK WATER PLANT MT0000625 | BILLINGS | 600 | — | — | Compliant |
| MEDICINE LAKE TOWN OF MT0000289 | MEDICINE LAKE | 600 | — | — | Compliant |
| HOT SPRINGS MUNICIPAL WATER MT0000251 | HOT SPRINGS | 600 | — | — | Compliant |
| BELT TOWN OF MT0000138 | BELT | 600 | — | — | Compliant |
| JOLIET TOWN OF MT0000256 | JOLIET | 600 | — | — | Compliant |
| CHERRY CREEK ESTATES LLC MT0004392 | BILLINGS | 600 | — | — | Compliant |
| VAUGHN CASCADE COUNTY WATER AND SEWER MT0000352 | VAUGHN | 585 | — | — | Compliant |
| FRENCHTOWN HIGH SCHOOL MT0000856 | FRENCHTOWN | 550 | — | — | Compliant |
| WIBAUX TOWN OF MT0000361 | WIBUAX | 550 | — | — | Compliant |
| BUSBY COMMUNITY WATER SYSTEM 083090063 | LAME DEER | 535 | — | — | Compliant |
| WINDSOR ESTATES MT0003807 | LINCOLN | 530 | — | — | Compliant |
| TWO BUTTES WATER USERS ASSN MT0000580 | FORT SHAW | 525 | — | — | Compliant |
| WYE AREA WATER SYSTEM MT0004107 | MISSOULA | 512 | — | — | Compliant |
| HIGHLAND PARK UTILITIES ASSN MT0000570 | GLENDIVE | 500 | — | — | Compliant |
| CAMP CREEK CAMPGROUND - BLM MT0003222 | LEWISTOWN | 500 | — | — | Compliant |
| RUDYARD WATER USERS MT0003126 | HINGHAM | 500 | — | — | Compliant |
| COVERED WAGON MB HM PARK MT0003810 | LINCOLN | 500 | — | — | Compliant |
| HOMESTEAD ACRES COUNTY WATER AND SEWER MT0000526 | GREAT FALLS | 500 | — | — | Compliant |
| W YELLOWSTONE MT SPRING WATER MT0003661 | WEST YELLOWSTONE | 500 | — | — | Compliant |
| MT STATE HOSPITAL WARM SPRINGS MT0000354 | WARM SPRINGS | 500 | — | — | Compliant |
| HEADQUARTERS APGAR MT0003176 | WEST GLACIER | 500 | — | — | Compliant |
| GORE HILL COUNTY WATER DIST MT0000232 | GREAT FALLS | 500 | — | — | Compliant |
| FROMBERG TOWN OF MT0000222 | FROMBERG | 498 | — | — | Compliant |
| ALBERTON TOWN OF MT0000015 | ALBERTON | 495 | — | — | Compliant |
| LODGE GRASS TOWN OF MT0000277 | LODGE GRASS | 480 | — | — | Compliant |
| CUSTER CO WATER AND SEWER DIST MT0003041 | MILES CITY | 480 | — | — | Compliant |
| CUT BANK NORTH WATER DISTRICT MT0000619 | CUT BANK | 478 | — | — | Compliant |
| PRYOR CREEK WATER ASSN MT0002956 | HUNTLEY | 475 | — | — | Compliant |
| FLATHEAD CO WATER DISTRICT NO 8 MT0000261 | COLUMBIA FALLS | 475 | — | — | Compliant |
| TRI COUNTY WATER DISTRICT MT0002912 | POWER | 470 | — | — | Compliant |
| SUNBURST TOWN OF MT0000338 | SUNBURST | 459 | — | — | Compliant |
| INDIAN SPRINGS RANCH SUB MT0004611 | EUREKA | 455 | — | — | Compliant |
| VALIER TOWN OF MT0000351 | VALIER | 452 | — | — | Compliant |
| FRAZER WATER SYSTEM 083090053 | WOLF POINT | 452 | — | — | Compliant |
| NORTH VALLEY COUNTY WATER AND SEWER DIST MT0003595 | GLASGOW | 450 | — | — | Compliant |
| BROADUS TOWN OF MT0000166 | BROADUS | 450 | — | — | Compliant |
| FROID TOWN OF MT0000221 | FROID | 450 | — | — | Compliant |
| FORT SMITH WATER AND SEWER DISTRICT MT0004765 | WORDEN | 450 | — | — | Compliant |
| BAXTER CREEK NO 2 HOA MT0003323 | BELGRADE | 450 | — | — | Compliant |
| ANDESITE RIDGE WATER SYSTEM MT0004468 | BIG SKY | 450 | — | — | Compliant |
| CONSOLIDATED CHARLO LAKE CO W AND S DIST MT0000172 | CHARLO | 450 | — | — | Compliant |
| CORAM COUNTY WATER AND SEWER DISTRICT MT0000189 | CORAM | 450 | — | — | Compliant |
| DRY PRAIRIE VALLEY COUNTY MT0004708 | CULBERTSON | 440 | — | — | Compliant |
| BUSHARD WATER COMPANY MT0005164 | BLACK EAGLE | 425 | — | — | Compliant |
| STANFORD TOWN OF MT0000334 | STANFORD | 425 | — | — | Compliant |
| TWIN BRIDGES TOWN OF MT0000349 | TWIN BRIDGES | 424 | — | — | Compliant |
| PRYOR WATER SYSTEM 083090012 | CROW AGENCY | 406 | — | — | Compliant |
| LA CASA GRANDE WATER AND SEWER DISTRICT MT0001924 | EAST HELENA | 404 | — | — | Compliant |
| EL-MAR TRAILER COURT MT0000375 | MISSOULA | 400 | — | — | Compliant |
| JOPLIN WATER USERS MT0003129 | HINGHAM | 400 | — | — | Compliant |
| FRAZER WATER USERS ASSN MT0000220 | FRAZER | 400 | — | — | Compliant |
| ROUND BUTTE WATER COMPANY MT0000320 | RONAN | 400 | — | — | Compliant |
| SKYVIEW WATER AND SEWER UTILITY MT0004039 | EAST HELENA | 400 | — | — | Compliant |
| HEART BUTTE WATER SYSTEM 083090005 | BROWNING | 400 | — | — | Compliant |
| HIGHWOOD MOBILE HOME PARK MT0004681 | GREAT FALLS | 400 | — | — | Compliant |
| ASHLAND WATER AND SEWER DIST MT0000458 | ASHLAND | 400 | — | — | Compliant |
| EKALAKA TOWN OF MT0000206 | EKALAKA | 400 | — | — | Compliant |
| WYLIE CREEK ESTATES SUBDIVISION MT0003961 | BOZEMAN | 400 | — | — | Compliant |
| EAGLEMAN COMMUNITY WATER 083090074 | BOX ELDER | 400 | — | — | Compliant |
| GOLDEN ESTATES HOMEOWNERS ASSOCIATION MT0004187 | EAST HELENA | 400 | — | — | Compliant |
| FOREST ACRES TR PK WHITEFISH MT0000064 | WHITEFISH | 390 | — | — | Compliant |
| GRANT CREEK WATER USERS ASSOCIATION INC MT0003305 | MISSOULA | 380 | — | — | Compliant |
| SUNDANCE SUBDIVISION MT0005056 | BILLINGS | 378 | — | — | Compliant |
| STONE CREEK SUBDIVISION MT0005183 | BILLINGS | 378 | — | — | Compliant |
| JETTE MEADOWS LAKE CO W AND S DIST MT0003100 | POLSON | 375 | — | — | Compliant |
| BROCKTON, TOWN OF 083090057 | WOLF POINT | 375 | — | — | Compliant |
| DRY REDWATER REGIONAL WATER AUTHORITY MT0004839 | CIRCLE | 365 | — | — | Compliant |
| JORDAN TOWN OF MT0000257 | JORDAN | 364 | — | — | Compliant |
| ST IGNATIUS (MISSION) SO.SIDE 083090031 | PABLO | 356 | — | — | Compliant |
| MT MOONLIGHT BASIN MT0004023 | BELGRADE | 355 | — | — | Compliant |
| CHERRY VIEW MT0004856 | LAKESIDE | 352 | — | — | Compliant |
| FORT SMITH W AND S DIST FORT SMITH TR PK MT0000104 | FORT SMITH | 350 | — | — | Compliant |
| HIDDEN LAKE YELLOWSTONE COUNTY W AND S D MT0003374 | BILLINGS | 350 | — | — | Compliant |
| FIRELIGHT MEADOWS LLC MT0004236 | BOZEMAN | 350 | — | — | Compliant |
| 779 RADAR SQUADRON MT0000500 | OPHEIM AFS | 350 | — | — | Compliant |
| BAINVILLE TOWN OF MT0000020 | BAINVILLE | 350 | — | — | Compliant |
| SUN PRAIRIE WATER DISTRICT MT0000571 | GREAT FALLS | 350 | — | — | Compliant |
| MONTANA DEVELOPMENT CENTER MT0000159 | BOULDER | 350 | — | — | Compliant |
| LOWER PIONEER MOUNTAIN WATER SYSTEM MT0004462 | BIG SKY | 350 | — | — | Compliant |
| WATER SERVICE INC TROUT CREEK MT0000347 | TROUT CREEK | 350 | — | — | Compliant |
| SADDLE MOUNTAIN CORP CLANCY MT0000057 | CLANCY | 350 | — | — | Compliant |
| MARTIN CITY COUNTY WATER DISTRICT MT0000286 | MARTIN CITY | 340 | — | — | Compliant |
| DUTTON TOWN OF MT0000204 | DUTTON | 338 | — | — | Compliant |
| IRON HORSE HOMEOWNERS ASSOC MT0004052 | COLUMBIA FALLS | 335 | — | — | Compliant |
| NOXON WATER DISTRICT MT0000299 | NOXON | 330 | — | — | Compliant |
| V.A. MEDICAL CENTER MILES CITY MT0001933 | MILES CITY | 325 | — | — | Compliant |
| FOREST PARK WATER USERS ASSOCIATION MT0000591 | CLANCY | 323 | — | — | Compliant |
| EMERALD VIEW PARK MT0002996 | BILLINGS | 320 | — | — | Compliant |
| MOUNTAIN ACRES MB HM PK MT0003809 | LINCOLN | 320 | — | — | Compliant |
| MIDVALE WATER AND SEWER DISTRICT MT0000211 | EUREKA | 320 | — | — | Compliant |
| SHILOH ROAD DEVELOPMENT MT0005178 | BILLINGS | 315 | — | — | Compliant |
| SOUTHSIDE PUBLIC WATER SUPPLY MT0002652 | KALISPELL | 306 | — | — | Compliant |
| SEVILLE WATER SYSTEM 083090008 | BROWNING | 300 | — | — | Compliant |
| HIGHLAND PARK WATER ASSOC MT0000230 | DAWSON | 300 | — | — | Compliant |
| HILDRETH SUBDIVISION NO 2 MT0002486 | DILLON | 300 | — | — | Compliant |
| COOKE CITY WATER DISTRICT MT0000187 | COOKE CITY | 300 | — | — | Compliant |
| OILMONT COUNTY WATER DISTRICT MT0000587 | SUNBURST | 300 | — | — | Compliant |
| ROBERTS WUA CARBON CO WATER AND SEWER MT0000317 | ROBERTS | 300 | — | — | Compliant |
| BIG SKY OF MONT INC MT0000151 | BIG SKY | 300 | — | — | Compliant |
| NASHUA TOWN OF MT0000297 | NASHUA | 300 | — | — | Compliant |
| CLYDE PARK WATER DEPT MT0000178 | CLYDE PARK | 300 | — | — | Compliant |
| KELLER SUBDIVISION NO 2 HOA MT0002485 | DILLON | 300 | — | — | Compliant |
| GILDFORD WATER USERS MT0003123 | HINGHAM | 300 | — | — | Compliant |
| MOBILE CITY HOME PARK NO 2 MT0003043 | BILLINGS | 300 | — | — | Compliant |
| MOUNTAIN MEADOWS ESTATES LLP MT0001791 | BILLINGS | 300 | — | — | Compliant |
| JETTE LAKE LANDOWNERS ASSOCIATION MT0003102 | POLSON | 295 | — | — | Compliant |
| NORTHERN PINES COMMUNITY HOA MT0004193 | COLUMBIA FALLS | 295 | — | — | Compliant |
| ANACONDA CCC MT0062254 | ANACONDA | 290 | — | — | Compliant |
| KEVIN TOWN OF MT0000265 | KEVIN | 290 | — | — | Compliant |
| WYOLA WATER SYSTEM 083090014 | CROW AGENCY | 281 | — | — | Compliant |
| RIDGEWOOD TERRACE MHP MT0004186 | LINCOLN | 280 | — | — | Compliant |
| HIGHWOOD COUNTY WATER AND SEWER DISTRICT MT0000248 | HIGHWOOD | 280 | — | — | Compliant |
| LIMA TOWN OF MT0000276 | LIMA | 279 | — | — | Compliant |
| HIDDEN VILLAGE MT0002386 | BIG SKY | 276 | — | — | Compliant |
| PACHE WATER SYSTEM 083090036 | PABLO | 276 | — | — | Compliant |
| TRAPPER CREEK JOB CORPS MT0062207 | DARBY | 275 | — | — | Compliant |
| GREAT FALLS RV PARK MT0000027 | GREAT FALLS | 274 | — | — | Compliant |
| WINIFRED TOWN OF MT0000363 | WINIFRED | 274 | — | — | Compliant |
| ALPINE PACIFIC UTILITIES MT0004700 | SOMERS | 270 | — | — | Compliant |
| RYEGATE TOWN OF MT0000322 | RYEGATE | 270 | — | — | Compliant |
| HYSHAM TOWN OF MT0000428 | HYSHAM | 262 | — | — | Compliant |
| COUNTRY LAKE HOMES WHITEFISH MT0003031 | KALISPELL | 260 | — | — | Compliant |
| GERALDINE TOWN OF MT0000225 | GERALDINE | 260 | — | — | Compliant |
| KATOONAH LODGES MT0003692 | MISSOULA | 258 | — | — | Compliant |
| DENTON TOWN OF MT0000199 | DENTON | 255 | — | — | Compliant |
| HILLTOP TERRACE NO 2 COLUMBIA F MT0003399 | KALISPELL | 250 | — | — | Compliant |
| MEADOW VILLAGE WATER DISTRICT MT0000645 | SIDNEY | 250 | — | — | Compliant |
| HEART BUTTE SCHOOL 083090009 | HEART BUTTE | 250 | — | — | Compliant |
| HINSDALE WATER DEPARTMENT MT0000250 | HINSDALE | 250 | — | — | Compliant |
| BLUE SKY HEIGHTS WUA CLANCY MT0000030 | CLANCY | 250 | — | — | Compliant |
| ANACONDA CIVILIAN CONS CENTER MT0000017 | ANACONDA | 250 | — | — | Compliant |
| TROUTBECK RISE LAKESIDE EST WATER SYSTEM MT0000267 | LAKESIDE | 250 | — | — | Compliant |
| LEXLEY ACRES MOBILE HOME PARK MT0000461 | BELGRADE | 250 | — | — | Compliant |
| SORREL SPRINGS HOA MT0000518 | FRENCHTOWN | 250 | — | — | Compliant |
| KICKING HORSE JOB CENTER MT0000558 | RONAN | 250 | — | — | Compliant |
| STARR SCHOOL WATER SYSTEM 083090007 | BROWNING | 250 | — | — | Compliant |
| WILSALL WATER DISTRICT MT0000362 | WILSALL | 250 | — | — | Compliant |
| RIDGEWOOD ESTATES MT0003175 | BIGFORK | 250 | — | — | Compliant |
| GRANITE PARK WATER ASSOCIATION MT0004563 | BILLINGS | 250 | — | — | Compliant |
| PRECISION WATER MT0004497 | BILLINGS | 250 | — | — | Compliant |
| PONDEROSA HOMEOWNERS ASSN INC MT0002863 | KALISPELL | 246 | — | — | Compliant |
| WELLS GARDEN ESTATES MT0002927 | BILLINGS | 240 | — | — | Compliant |
| FORT PECK TOWN OF MT0000218 | FORT PECK | 240 | — | — | Compliant |
| YELLOWSTONE BOYS AND GIRLS RANCH MT0000154 | BILLINGS | 240 | — | — | Compliant |
| HEART BUTTE SCHOOL MT0003160 | HEART BUTTE | 240 | — | — | Compliant |
| GREEN TREE MEADOWS COUNTY W AND S DIST MT0003194 | BIGFORK | 237 | — | — | Compliant |
| SKYCREST ESTATES SUBDIVISION MT0004964 | BILLINGS | 235 | — | — | Compliant |
| EAGLE BEND DEVELOPMENT MT0003071 | BIGFORK | 235 | — | — | Compliant |
| KOKANEE BEND HOA MT0002997 | COLUMBIA FALLS | 230 | — | — | Compliant |
| HUNTLEY YELLOWSTONE CO WATER AND SEWER MT0000254 | HUNTLEY | 230 | — | — | Compliant |
| HEBGEN LAKE ESTATES CO WATER SEWER DISTR MT0001983 | WEST YELLOWSTONE | 230 | — | — | Compliant |
| SPIRIT HILLS SUBDIVISION MT0004208 | BOZEMAN | 230 | — | — | Compliant |
| CLANCY WATER DEPT MT0000177 | CLANCY | 230 | — | — | Compliant |
| NEIHART TOWN OF MT0000298 | NEIHART | 229 | — | — | Compliant |
| GRASS LAND ESTATES MT0004448 | EAST HELENA | 228 | — | — | Compliant |
| TURTLE LAKE WATER SYSTEM 083090032 | PABLO | 225 | — | — | Compliant |
| SAGE CREEK CO WATER DISTRICT MT0003150 | CHESTER | 225 | — | — | Compliant |
| LAST STARR HOMES (INACTIVE) 083090006 | BROWNING | 225 | — | — | Compliant |
| CRYSTAL SPRINGS WATER SYSTEM MT0003986 | BILLINGS | 225 | — | — | Compliant |
| HOLMBERG VILLAGE ESTATES MT0004190 | HELENA | 225 | — | — | Compliant |
| ELMO WATER SYSTEM 083090024 | PABLO | 220 | — | — | Compliant |
| THE NINES SUBDIVISION MT0004989 | BILLINGS | 220 | — | — | Compliant |
| HOLLYWOOD HEIGHTS TRAILER PARK LLC MT0000454 | MISSOULA | 220 | — | — | Compliant |
| MNIHNAPA WATER SYSTEM 083090047 | HARLEM | 220 | — | — | Compliant |
| SALISH SHORES TRADE WINDS COMM VILLAGE MT0003911 | THOMPSON FALLS | 215 | — | — | Compliant |
| CIRCLE H WATER INC MT0004446 | MISSOULA | 215 | — | — | Compliant |
| GLACIER POINT HO AND WUA MT0004559 | HELENA | 210 | — | — | Compliant |
| WAGON WHEEL TRAILER VILLAGE MT0000379 | MISSOULA | 210 | — | — | Compliant |
| ASHLAND COMMUNITY WATER SYSTEM 083090061 | LAME DEER | 210 | — | — | Compliant |
| STOCKETT WATER AND SEWER DIST MT0000579 | STOCKETT | 210 | — | — | Compliant |
| FLATHEAD COUNTY WATER DIST 101 MT0000184 | COLUMBIA FALLS | 210 | — | — | Compliant |
| EAST GATE WORK CAMP MT0003440 | GARDINER | 208 | — | — | Compliant |
| WILDERNESS PLATEAU WATER AND SEWER DIST MT0002985 | TROY | 208 | — | — | Compliant |
| GOODAN KEIL CO WATER DIST MT0002393 | MISSOULA | 207 | — | — | Compliant |
| HAPPY VALLEY WATER DIST B KSPL MT0001984 | COLUMBIA FALLS | 207 | — | — | Compliant |
| POWER TETON COUNTY WATER DIST MT0000311 | POWER | 205 | — | — | Compliant |
| BRIDGE CREEK ESTATES SUBDIVISION MT0004555 | EAST HELENA | 205 | — | — | Compliant |
| BELFRY CARBON CO WATER AND SEWER DIST MT0000460 | BELFRY | 205 | — | — | Compliant |
| LION MOUNTAIN HOMEOWNERS ASSOC MT0000392 | COLUMBIA FALLS | 204 | — | — | Compliant |
| JETTE MEADOWS LAKE CO W&S DIST PHASE II MT0003101 | POLSON | 200 | — | — | Compliant |
| BABB WATER USERS ASSN MT0000019 | BABB | 200 | — | — | Compliant |
| LOMA COUNTY WATER DISTRICT MT0002669 | LOMA | 200 | — | — | Compliant |
| SOUTH WIND WATER AND SEWER DISTRICT MT0000025 | GREAT FALLS | 200 | — | — | Compliant |
| MISSION MEADOWS RV CAMPSITE PARK, INC MT0000621 | MISSOULA | 200 | — | — | Compliant |
| OAK RIDGE ESTATES MT0004250 | BILLINGS | 200 | — | — | Compliant |
| BEARCREEK MUNICIPAL WATER SYS MT0000063 | RED LODGE | 200 | — | — | Compliant |
| KREMLIN WATER USERS MT0003121 | HINGHAM | 200 | — | — | Compliant |
| LIBBY DAM PROJECT SEATTLE DIST MT0000273 | LIBBY | 200 | — | — | Compliant |
| GALATA COUNTY WATER DISTRICT MT0000009 | GALATA | 200 | — | — | Compliant |
| BASIN COUNTY WATER AND SEWER DIST MT0000014 | BASIN | 200 | — | — | Compliant |
| AQUA GOAT LLC MT0005161 | BILLINGS | 200 | — | — | Compliant |
| DIXON, TOWN OF 083090034 | PABLO | 200 | — | — | Compliant |
| PARADISE WATER DISTRICT MT0000385 | PARADISE | 200 | — | — | Compliant |
| KOUNTZ TRAILER COURT MT0001788 | BOZEMAN | 200 | — | — | Compliant |
| GO 2 U WATER DELIVERY MT0004754 | LAUREL | 200 | — | — | Compliant |
| BROADVIEW TOWN OF MT0000167 | BROADVIEW | 200 | — | — | Compliant |
| INDIAN WATER USERS ASSOC. MT0000207 | ELMO | 200 | — | — | Compliant |
| EAST GLACIER PARK CO MT0000205 | EAST GLACIER | 200 | — | — | Compliant |
| RED WHEEL TRAILER COURT MT0000024 | GREAT FALLS | 200 | — | — | Compliant |
| TRACY WATER USERS CORP MT0000345 | SAND COULEE | 200 | — | — | Compliant |
| VALLEY GARDEN GOLF VILLAGE HOA MT0003597 | ENNIS | 195 | — | — | Compliant |
| MUDDY CLUSTER WATER SYSTEM 083090065 | LAME DEER | 195 | — | — | Compliant |
| GREENWOOD VILLAGE RV AND MHP MT0003602 | KALISPELL | 195 | — | — | Compliant |
| TWO BUTTES WATER USERS ASSN MT0000219 | FORT SHAW | 195 | — | — | Compliant |
| PINE HILLS YOUTH CORRECT FACIL MT0000292 | MILES CITY | 193 | — | — | Compliant |
| STAR MOBILE HOME PARK MT0000034 | BOZEMAN | 190 | — | — | Compliant |
| SUNSET WEST DEVELOPMENT MT0000383 | MISSOULA | 190 | — | — | Compliant |
| STILL RIVER ESTATES SUBDIVISION MT0005118 | BILLINGS | 188 | — | — | Compliant |
| WINNETT TOWN OF MT0000364 | WINNETT | 187 | — | — | Compliant |
| PELE PARK MT0000593 | EAST HELENA | 186 | — | — | Compliant |
| MOORE TOWN OF MT0000295 | MOORE | 186 | — | — | Compliant |
| RAMSHORN VIEW ESTATES MT0004035 | TOWNSEND | 185 | — | — | Compliant |
| HINGHAM WATER USERS MT0003124 | HINGHAM | 181 | — | — | Compliant |
| TAMARACK WOODS HOA LAKESIDE MT0003393 | KALISPELL | 180 | — | — | Compliant |
| BAIR CLARK PROPERTIES, LLC MT0000374 | MISSOULA | 180 | — | — | Compliant |
| GOLDEN AGE VILLAGE MT0003313 | EMIGRANT | 180 | — | — | Compliant |
| SANGSTER WATER HAULING LLC MT0003551 | GREAT FALLS | 180 | — | — | Compliant |
| SACO TOWN OF MT0000323 | SACO | 180 | — | — | Compliant |
| DAVIS MEADOW VILLAGE MT0003990 | EAST HELENA | 180 | — | — | Compliant |
| CHERRY CREEK WUA GLASGOW MT0000228 | GLASGOW | 180 | — | — | Compliant |
| RICHEY TOWN OF MT0000316 | RICHEY | 180 | — | — | Compliant |
| SAND COULEE WATER USERS DISTRICT MT0000325 | SAND COULEE | 180 | — | — | Compliant |
| INDIAN WATER USERS ASSN MT0000324 | SAINT IGNATIUS | 180 | — | — | Compliant |
| CASITAS DEL MESA MHP MT0002738 | GLENDIVE | 180 | — | — | Compliant |
| ELK MEADOWS RANCHETTES MT0000632 | HUSON | 175 | — | — | Compliant |
| FISCHER'S TRAILER COURT MT0000026 | GREAT FALLS | 175 | — | — | Compliant |
| MOBILE CITY TRAILER COURT MT0000646 | MISSOULA | 175 | — | — | Compliant |
| TOWN VIEW ESTATES WUA INC MT0002172 | HELENA | 175 | — | — | Compliant |
| FOREST PARK TRAILER COURT #2 MT0001367 | BOZEMAN | 175 | — | — | Compliant |
| KOOTENAI CREEK VILLAGE MT0004241 | HAMILTON | 175 | — | — | Compliant |
| MOUNTAIN HERITAGE WATER SYSTEM MT0002873 | HELENA | 175 | — | — | Compliant |
| CINNABAR THE MT0001557 | GARDINER | 175 | — | — | Compliant |
| WESTBY TOWN OF MT0000355 | WESTBY | 172 | — | — | Compliant |
| AZURE VS GW 083090071 | BOX ELDER | 171 | — | — | Compliant |
| TEN MILE-PLEANSANT VALLEY WUA MT0002035 | HELENA | 170 | — | — | Compliant |
| MISSION HOUSING WATER SYSTEM 083090043 | HARLEM | 170 | — | — | Compliant |
| MELSTONE TOWN OF MT0000290 | MELSTONE | 170 | — | — | Compliant |
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