City Water Quality Rankings in Idaho
91 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#49
Mountain Home Afb
County, ID
91 A
#50 Bayview
County, ID
90 A
#51 Cascade
County, ID
90 A
#52 Kellogg
County, ID
90 A
#53 Wendell
County, ID
90 A
#54 Buhl
County, ID
87 B
#55 Orofino
County, ID
87 B
#56 Grangeville
County, ID
86 B
#57 Ketchum
County, ID
86 B
#58 Malad City
County, ID
86 B
#59 Rupert
County, ID
86 B
#60 Driggs
County, ID
85 B
#61 Moyie Springs
County, ID
85 B
#62 Montpelier
County, ID
83 B
#63 Arco
County, ID
82 B
#64 Ammon
County, ID
81 B
#65 Caldwell
County, ID
81 B
#66 Twin Falls
County, ID
80 B
#67 Ashton
County, ID
79 B
#68 Glenns Ferry
County, ID
78 B
#69 Pocatello
County, ID
76 B
#70 Lewiston
County, ID
73 C
#71 Burley
County, ID
72 C
#72 Rigby
County, ID
72 C
Frequently Asked Questions
How are city water quality rankings calculated in Idaho?
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 Idaho?
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.