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

#CityScorePopulationViolations
1BillingsA (92)131,90013
2MissoulaB (66)69,55052
3BozemanB (63)62,54368
4Great FallsD (36)61,80098
5HelenaD (28)33,291140
6ButteF (0)33,00088
7KalispellC (48)32,77579
8BelgradeF (8)14,660176
9WhitefishD (21)12,853193
10HavreC (56)9,92125
11West YellowstoneF (0)9,89989
12Miles CityD (25)9,56540
13Malmstrom Air Force BaseD (38)8,85026
14AnacondaC (42)8,71574
15LivingstonF (0)7,500333
16LaurelF (6)6,33963
17BrowningC (53)6,17560
18BigforkC (52)6,10017
19GlendiveF (6)6,073178
20LewistownF (0)5,923161
21HamiltonB (79)5,58510
22PolsonF (0)5,30093
23Deer LodgeC (48)5,00069
24SidneyA (96)5,0001
25LibbyF (0)4,892102
26PoplarB (61)4,75129
27Columbia FallsC (46)4,45031
28DillonA (82)4,3007
29Big SkyC (44)4,13233
30East HelenaB (73)4,11428
31ShelbyC (47)3,97026
32HardinC (42)3,50026
33Box ElderF (0)3,442201
34LoloC (53)3,31540
35GlasgowB (78)3,25319
36Cut BankF (8)3,10576
37CulbertsonC (58)3,00511
38RoundupA (90)3,00012
39Wolf PointA (100)3,0000
40Lame DeerF (0)2,60594
41ConradC (58)2,50011
42RonanF (12)2,48384
43ColstripD (34)2,35055
44ForsythF (0)2,260176
45PabloC (40)2,17517
46HarlemF (0)2,100260
47TroyB (73)2,1008
48StevensvilleC (50)2,09038
49Red LodgeA (86)2,00011
50TownsendF (0)2,000113
51EurekaC (52)1,99525
52Thompson FallsB (66)1,95030
53ColumbusD (29)1,90060
54Three ForksF (16)1,90073
55BakerF (0)1,858136
56MaltaF (0)1,800194
57ManhattanD (29)1,80068
58HinghamF (0)1,720133
59PlainsF (0)1,700126
60PlentywoodA (90)1,7002
61ChoteauB (79)1,69118
62Big TimberC (44)1,65037
63Seeley LakeF (0)1,57587
64Fort BentonB (67)1,50022
65Virginia CityF (14)1,50046
66WhitehallF (0)1,500227
67BoulderF (0)1,40087
68EnnisD (29)1,40059
69PhilipsburgF (0)1,36074
70ChinookF (14)1,30026
71Crow AgencyF (0)1,300175
72Fort HarrisonB (75)1,27514
73Black EagleB (70)1,23310
74LakesideA (86)1,2257
75Hungry HorseB (68)1,13528
76AbsarokeeF (0)1,100135
77SuperiorA (89)1,1008
78HarlowtonC (56)1,05037
79West GlacierA (100)1,0300
80ScobeyA (91)1,0269