City Water Quality Rankings in Idaho
90 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#73
Idaho Falls
County, ID
74 C
#74 Blackfoot
County, ID
72 C
#75 Burley
County, ID
72 C
#76 Glenns Ferry
County, ID
72 C
#77 Hansen
County, ID
71 C
#78 Rigby
County, ID
69 C
#79 Boise
County, ID
65 C
#80 Kamiah
County, ID
62 C
#81 Preston
County, ID
59 D
#82 Sun Valley
County, ID
58 D
#83 Franklin
County, ID
57 D
#84 Filer
County, ID
53 D
#85 Salmon
County, ID
46 D
#86 Mountain Home
County, ID
41 F
#87 Fort Hall
County, ID
13 F
#88 Fruitland
County, ID
2 F
#89 Bellevue
County, ID
0 F
#90 Mccall
County, ID
0 F
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.