C50/100
Montana Tap Water Quality Rankings 2026
80 cities · 683,882 people served
Top Contaminant Concerns
Copper (90th percentile)Lead (90th percentile)PFOS
All Cities in Montana
| # | City | Score | Population | Violations |
|---|---|---|---|---|
| 1 | Billings | A (92) | 131,900 | 13 |
| 2 | Missoula | B (66) | 69,550 | 52 |
| 3 | Bozeman | B (63) | 62,543 | 68 |
| 4 | Great Falls | D (36) | 61,800 | 98 |
| 5 | Helena | D (28) | 33,291 | 140 |
| 6 | Butte | F (0) | 33,000 | 88 |
| 7 | Kalispell | C (48) | 32,775 | 79 |
| 8 | Belgrade | F (8) | 14,660 | 176 |
| 9 | Whitefish | D (21) | 12,853 | 193 |
| 10 | Havre | C (56) | 9,921 | 25 |
| 11 | West Yellowstone | F (0) | 9,899 | 89 |
| 12 | Miles City | D (25) | 9,565 | 40 |
| 13 | Malmstrom Air Force Base | D (38) | 8,850 | 26 |
| 14 | Anaconda | C (42) | 8,715 | 74 |
| 15 | Livingston | F (0) | 7,500 | 333 |
| 16 | Laurel | F (6) | 6,339 | 63 |
| 17 | Browning | C (53) | 6,175 | 60 |
| 18 | Bigfork | C (52) | 6,100 | 17 |
| 19 | Glendive | F (6) | 6,073 | 178 |
| 20 | Lewistown | F (0) | 5,923 | 161 |
| 21 | Hamilton | B (79) | 5,585 | 10 |
| 22 | Polson | F (0) | 5,300 | 93 |
| 23 | Deer Lodge | C (48) | 5,000 | 69 |
| 24 | Sidney | A (96) | 5,000 | 1 |
| 25 | Libby | F (0) | 4,892 | 102 |
| 26 | Poplar | B (61) | 4,751 | 29 |
| 27 | Columbia Falls | C (46) | 4,450 | 31 |
| 28 | Dillon | A (82) | 4,300 | 7 |
| 29 | Big Sky | C (44) | 4,132 | 33 |
| 30 | East Helena | B (73) | 4,114 | 28 |
| 31 | Shelby | C (47) | 3,970 | 26 |
| 32 | Hardin | C (42) | 3,500 | 26 |
| 33 | Box Elder | F (0) | 3,442 | 201 |
| 34 | Lolo | C (53) | 3,315 | 40 |
| 35 | Glasgow | B (78) | 3,253 | 19 |
| 36 | Cut Bank | F (8) | 3,105 | 76 |
| 37 | Culbertson | C (58) | 3,005 | 11 |
| 38 | Roundup | A (90) | 3,000 | 12 |
| 39 | Wolf Point | A (100) | 3,000 | 0 |
| 40 | Lame Deer | F (0) | 2,605 | 94 |
| 41 | Conrad | C (58) | 2,500 | 11 |
| 42 | Ronan | F (12) | 2,483 | 84 |
| 43 | Colstrip | D (34) | 2,350 | 55 |
| 44 | Forsyth | F (0) | 2,260 | 176 |
| 45 | Pablo | C (40) | 2,175 | 17 |
| 46 | Harlem | F (0) | 2,100 | 260 |
| 47 | Troy | B (73) | 2,100 | 8 |
| 48 | Stevensville | C (50) | 2,090 | 38 |
| 49 | Red Lodge | A (86) | 2,000 | 11 |
| 50 | Townsend | F (0) | 2,000 | 113 |
| 51 | Eureka | C (52) | 1,995 | 25 |
| 52 | Thompson Falls | B (66) | 1,950 | 30 |
| 53 | Columbus | D (29) | 1,900 | 60 |
| 54 | Three Forks | F (16) | 1,900 | 73 |
| 55 | Baker | F (0) | 1,858 | 136 |
| 56 | Malta | F (0) | 1,800 | 194 |
| 57 | Manhattan | D (29) | 1,800 | 68 |
| 58 | Hingham | F (0) | 1,720 | 133 |
| 59 | Plains | F (0) | 1,700 | 126 |
| 60 | Plentywood | A (90) | 1,700 | 2 |
| 61 | Choteau | B (79) | 1,691 | 18 |
| 62 | Big Timber | C (44) | 1,650 | 37 |
| 63 | Seeley Lake | F (0) | 1,575 | 87 |
| 64 | Fort Benton | B (67) | 1,500 | 22 |
| 65 | Virginia City | F (14) | 1,500 | 46 |
| 66 | Whitehall | F (0) | 1,500 | 227 |
| 67 | Boulder | F (0) | 1,400 | 87 |
| 68 | Ennis | D (29) | 1,400 | 59 |
| 69 | Philipsburg | F (0) | 1,360 | 74 |
| 70 | Chinook | F (14) | 1,300 | 26 |
| 71 | Crow Agency | F (0) | 1,300 | 175 |
| 72 | Fort Harrison | B (75) | 1,275 | 14 |
| 73 | Black Eagle | B (70) | 1,233 | 10 |
| 74 | Lakeside | A (86) | 1,225 | 7 |
| 75 | Hungry Horse | B (68) | 1,135 | 28 |
| 76 | Absarokee | F (0) | 1,100 | 135 |
| 77 | Superior | A (89) | 1,100 | 8 |
| 78 | Harlowton | C (56) | 1,050 | 37 |
| 79 | West Glacier | A (100) | 1,030 | 0 |
| 80 | Scobey | A (91) | 1,026 | 9 |