WaterQ

City Water Quality Rankings in Wyoming

55 cities ranked by drinking water quality.

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Popular city water quality comparisons

Alta, WY vs Bar Nunn, WY Compare → Douglas, WY vs Evanston, WY Compare → Green River, WY vs Moose, WY Compare → Rock Springs, WY vs Afton, WY Compare →

Trending Cities

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#25
Torrington
County, WY
94 A
#26
Basin
County, WY
93 A
#27
Casper
County, WY
93 A
#28
Lander
County, WY
93 A
#29
Wilson
County, WY
93 A
#30
Guernsey
County, WY
92 A
#31
Lusk
County, WY
92 A
#32
Upton
County, WY
92 A
#33
Riverton
County, WY
91 A
#34
Burns
County, WY
90 A
#35
Ranchester
County, WY
90 A
#36
Moorcroft
County, WY
88 B
#37
Mountain View
County, WY
86 B
#38
Sheridan
County, WY
86 B
#39
Dubois
County, WY
85 B
#40
Rawlins
County, WY
85 B
#41
Ethete
County, WY
82 B
#42
Greybull
County, WY
81 B
#43
Star Valley Ranch
County, WY
81 B
#44
Yellowstone
County, WY
77 B
#45
Mills
County, WY
75 B
#46
Alpine
County, WY
73 C
#47
Fort Washakie
County, WY
72 C
#48
Buffalo
County, WY
60 C

Frequently Asked Questions

How are city water quality rankings calculated in Wyoming?

WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.

Can I compare two cities in Wyoming?

Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.

How often does WaterQ refresh city data?

City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.

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