City Water Quality Rankings in Hawaii
19 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#1
Kailua-Kona
County, HI
100 A
#2 Waikoloa
County, HI
94 A
#3 Lihue
County, HI
92 A
#4 Hilo
County, HI
91 A
#5 Schofield Barracks
County, HI
90 A
#6 Hawaii National Park
County, HI
88 B
#7 Honolulu
County, HI
88 B
#8 Pahoa
County, HI
88 B
#9 Jbpph
County, HI
85 B
#10 Princeville
County, HI
76 B
#11 Makawao
County, HI
74 C
#12 Kaneohe Bay
County, HI
67 C
#13 Kapalua
County, HI
58 D
#14 Kaunakakai
County, HI
56 D
#15 Lanai City
County, HI
55 D
#16 Laie
County, HI
42 F
#17 Wailuku
County, HI
39 F
#18 Kaumakani
County, HI
24 F
#19 Maunaloa
County, HI
0 F
Frequently Asked Questions
How are city water quality rankings calculated in Hawaii?
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 Hawaii?
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.