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Hawaii Water Quality Rankings

64 cities ranked · Data from EPA SDWIS

91.6
State avg score
64
Cities ranked
100%
A or B grade
0%
D or F grade
33
Health violations
2
PFAS detected
Analysis

Hawaii water quality overview

Hawaii's drinking water quality is excellent overall, with a state average score of 91.6 out of 100 — 17.1 points above the national average of 74.5. The median city score is 92.6, reflecting how water quality is distributed across the state's 64 ranked cities. 100% of Hawaii cities earned an A or B grade, indicating broadly strong water quality infrastructure. Only 0 cities received a failing grade. PFAS "forever chemicals" were detected in 2 of 64 cities (3%). All detected levels remain within current EPA limits, though any PFAS detection warrants attention. 33 cities have recorded health-based violations with the EPA — meaning contaminant levels exceeded safe limits or required testing was missed. Use the table below to find your city's specific record.

Grade Distribution

How Hawaii cities scored

86%
14%
A
55
86%
Excellent
B
9
14%
Good
C
0
0%
Fair
D
0
0%
Poor
F
0
0%
Failing
Score Distribution

Score distribution by range

42 21 0
3
19
42
0–9
10–19
20–29
30–39
40–49
50–59
60–69
70–79
80–89
90–100
Comparison

State vs national average

A
Hawaii
91.6/100
B-
National avg
74.5/100
▲ 17.1 pts above national average
City Map

Water quality across Hawaii

Each dot is a city, colored by grade. Size reflects population served. Click any city to view its full report.

Hawaii city water quality map
Water quality: A B C D F
24 cities mapped · hover to preview · click to explore
Highlights

Top & bottom cities in Hawaii

Best 10 cities

  1. 1 A+ Olaa-Mt.View 100 6K
  2. 2 A+ Haina 100 5K
  3. 3 A+ Kilauea (Dow) 100 3K
  4. 4 A+ Downtown Honolulu 99.3 3K
  5. 5 A+ Sunset Beach 99 5K
  6. 6 A+ Waiohinu-Naalehu 98.5 3K
  7. 7 A+ Mililani Bws 97.5 51K
  8. 8 A+ Kapalua (Dho) 97.3 4K
  9. 9 A+ Lalamilo 97 2K
  10. 10 A+ Paauilo 97 716

Worst 10 cities

  1. 55 B- Kula 74.5 8K
  2. 56 B Lahaina 77.1 20K
  3. 57 B Kona 79.8 2K
  4. 58 B+ South Kohala 80.4 10K
  5. 59 B+ Pepeekeo 82.4 1K
  6. 60 B+ Kohala Joint Venture 82.7 850
  7. 61 B+ Makawao 83 30K
  8. 62 B+ Honolulu 83.3 23K
  9. 63 B+ Waialua-Haleiwa 84.2 10K
  10. 64 A- North Kohala 85.7 5K
Full Rankings

All 64 cities in Hawaii

# City Grade Score Score Population Violations Issues
1 Olaa-Mt.View
A+
 100
6K 0 Zero violations
2 Haina
A+
 100
5K 0 Zero violations
3 Kilauea (Dow)
A+
 100
3K 1
4 Downtown Honolulu
A+
 99.3
3K 9 Health
5 Sunset Beach
A+
 99
5K 0 Zero violations
6 Waiohinu-Naalehu
A+
 98.5
3K 0 Zero violations
7 Mililani Bws
A+
 97.5
51K 14
8 Kapalua (Dho)
A+
 97.3
4K 6 Health Unresolved
9 Lalamilo
A+
 97
2K 1
10 Paauilo
A+
 97
716 0 Zero violations
11 Mahanalua Nui
A+
 97
606 0 Zero violations
12 Kawela
A+
 97
553 1
13 Haena-Wainiha
A+
 96.9
833 2
14 Waikoloa (Dho)
A+
 96.7
12K 6 Health Unresolved
15 Kaunakakai
A+
 96.1
4K 12 Health Unresolved
16 Mokuleia
A+
 96.1
2K 8 Health
17 Waipio
A+
 95.8
12K 0 Zero violations
18 Pearl Harbor
A
 94.8
65K 11 Health Unresolved
19 Kekaha (Dow)
A
 94.5
6K 9 Unresolved
20 Ualapue
A
 94.3
1K 9 Unresolved
21 Keola Hana-Hotel Dho
A
 94.3
816 8 Health Unresolved
22 Wahiawa
A
 94
6K 37 Health Unresolved
23 Moanalua
A
 94
6K 9 Health Unresolved
24 Kaumakani
A
 93.8
1K 10 Health Unresolved
25 Hana
A
 93.7
1K 13 Health Unresolved
26 Salt Lake
A
 93.5
6K 6 Health Unresolved
27 Lihue-Kapaa
A
 93.3
35K 10 Unresolved
28 Hawaiian Shores Dho
A
 93.2
4K 4 Health Unresolved
29 Hoolehua
A
 93.2
2K 13 Unresolved
30 Honomu
A
 93
645 0 Zero violations
31 Waipahu-Ewa-Waianae
A
 92.8
217K 9 Unresolved
32 Princeville (Dho)
A
 92.7
7K 2 Unresolved
33 Laie
A
 92.6
6K 2 Health Unresolved
34 Kualapuu
A
 92.3
500 22 Health Unresolved
35 Schofield Barracks
A
 91.8
45K 15 Health Unresolved
36 Hilo
A
 91.7
39K 49 Health Unresolved
37 Kaanapali (Dho)
A
 91.7
8K 7 Health Unresolved
38 Lanai
A
 91.5
3K 46 Health Unresolved
39 Wailuku
A
 91.4
75K 19 Health Unresolved
40 Honolulu-Windward-Pearlharbor
A
 91.1
631K 44 Health Unresolved
41 Hvnp (Dho)
A
 90.5
4K 4 Health Unresolved
42 Maunaloa, Molokai
A
 90.1
1K 41 Health Unresolved
43 South Kona
A-
 89.7
7K 1 Unresolved
44 Kapalama
A-
 89.7
4K 1 Unresolved
45 Papaikou
A-
 89.7
2K 2 Unresolved
46 Pahoa
A-
 89.7
2K 2 Unresolved
47 Hanalei (Dow)
A-
 89.7
500 2 Unresolved
48 Pmrf Housing (Dho)
A-
 89.6
1K 2 Health Unresolved
49 Hanapepe-Eleele (Dow)
A-
 89.5
6K 4 Unresolved
50 Kalaheo
A-
 89
13K 3 Unresolved
51 Kaneohe
A-
 88.3
16K 7 Health Unresolved
52 North Kona
A-
 88.2
30K 2 Unresolved
53 Laupahoehoe
A-
 86.7
1K 1 Unresolved
54 Kahuku
A-
 85.9
3K 1 Unresolved
55 North Kohala
A-
 85.7
5K 1 Unresolved
56 Waialua-Haleiwa
B+
 84.2
10K 8 Health Unresolved
57 Honolulu
B+
 83.3
23K 8 Health Unresolved
58 Makawao
B+
 83
30K 101 Health Unresolved
59 Kohala Joint Venture
B+
 82.7
850 1 Unresolved
60 Pepeekeo
B+
 82.4
1K 2 Health Unresolved
61 South Kohala
B+
 80.4
10K 97 Health Unresolved
62 Kona
B
 79.8
2K 17 Health Unresolved
63 Lahaina
B
 77.1
20K 146 Health Unresolved
64 Kula
B-
 74.5
8K 139 Health Unresolved
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