Hawaii Tap Water Quality
Explore tap water quality data for counties across Hawaii. View water system reports, track violations, monitor drinking water safety, and check fluoridation status in your community.
Total Counties
99
Communities with public water systems
Total Population
1,507,520
Residents served by public water systems
Water Systems
137
Public water systems statewide
Serious Violators
0
Systems with serious violations
Counties
99
With water systems
Population
1,507,520
Served by water systems
Water Systems
137
Total water systems
Violators
0
Systems with serious violations
Searching by your address yields the most accurate results. Searching by town or water system may not show all systems due to how the EPA categorizes data. Some towns may be listed under counties, and water system boundaries don't always align with town boundaries.
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Hawaii Counties
Anahola
Population: 2,617
Water Systems: 3
Anahola Farm Lots
Population: 385
Water Systems: 1
Downtown Honolulu
Population: 3,440
Water Systems: 1
Eleele
Population: 2,796
Water Systems: 1
Ewa
Population: 74,245
Water Systems: 2
Haena
Population: 416
Water Systems: 1
Haiku
Population: 180
Water Systems: 3
Haina
Population: 4,563
Water Systems: 1
Hakalau
Population: 201
Water Systems: 1
Haleakala
Population: 80
Water Systems: 1
Haleiwa
Population: 5,263
Water Systems: 4
Hana
Population: 2,260
Water Systems: 3
Hanalei
Population: 674
Water Systems: 2
Hanapepe
Population: 2,796
Water Systems: 1
Hawaiian Shores Dho
Population: 4,906
Water Systems: 2
Hilo
Population: 39,477
Water Systems: 1
Honolulu
Population: 278,889
Water Systems: 6
Honomu
Population: 645
Water Systems: 1
Hoolehua
Population: 2,400
Water Systems: 1
Hvnp
Population: 5,205
Water Systems: 1
Kaanapali
Population: 8,000
Water Systems: 1
Kahakuloa Homestead
Population: 150
Water Systems: 1
Kahana Valley
Population: 300
Water Systems: 1
Kahili Mountain Park
Population: 175
Water Systems: 1
Kahuku
Population: 2,730
Water Systems: 1
Kahuku Air Base
Population: 75
Water Systems: 1
Kailua Maui
Population: 90
Water Systems: 1
Kalaheo
Population: 12,660
Water Systems: 1
Kalapana
Population: 275
Water Systems: 1
Kalaupapa
Population: 110
Water Systems: 1
Kaneohe
Population: 16,300
Water Systems: 1
Kapaa
Population: 17,427
Water Systems: 1
Kapalama
Population: 4,000
Water Systems: 1
Kapalua
Population: 4,200
Water Systems: 1
Kaumakani
Population: 1,271
Water Systems: 1
Kaunakakai
Population: 3,702
Water Systems: 1
Kawaihae
Population: 193
Water Systems: 1
Kawela
Population: 553
Water Systems: 1
Kealia
Population: 260
Water Systems: 1
Keanae
Population: 270
Water Systems: 1
Kekaha
Population: 5,998
Water Systems: 1
Kihei
Population: 26
Water Systems: 1
Kilauea
Population: 3,420
Water Systems: 1
Kohala Joint Venture
Population: 850
Water Systems: 1
Kona
Population: 3,455
Water Systems: 4
Kualapuu
Population: 500
Water Systems: 1
Kukuihaele
Population: 483
Water Systems: 1
Kula
Population: 12,488
Water Systems: 4
Lahaina
Population: 20,107
Water Systems: 2
Laie
Population: 5,577
Water Systems: 1
Lalamilo
Population: 1,895
Water Systems: 1
Lanai
Population: 3,200
Water Systems: 1
Laupahoehoe
Population: 1,169
Water Systems: 1
Lihue
Population: 17,427
Water Systems: 1
Mahanalua Nui
Population: 606
Water Systems: 1
Makawao
Population: 29,900
Water Systems: 2
Makena
Population: 360
Water Systems: 1
Maunaloa
Population: 500
Water Systems: 1
Mililani Bws
Population: 50,573
Water Systems: 1
Moanalua
Population: 5,555
Water Systems: 1
Mokuleia
Population: 1,800
Water Systems: 1
Molokai
Population: 500
Water Systems: 1
Mountain View
Population: 3,233
Water Systems: 1
Naalehu
Population: 1,474
Water Systems: 1
Nahiku
Population: 107
Water Systems: 1
Ninole
Population: 151
Water Systems: 1
Niulii
Population: 254
Water Systems: 1
North Kohala
Population: 4,933
Water Systems: 1
North Kona
Population: 29,581
Water Systems: 1
Olaa
Population: 3,233
Water Systems: 1
Olowalu
Population: 100
Water Systems: 1
Ookala
Population: 264
Water Systems: 1
Paauilo
Population: 716
Water Systems: 1
Pahala
Population: 1,301
Water Systems: 2
Pahoa
Population: 1,885
Water Systems: 1
Papaikou
Population: 2,203
Water Systems: 1
Pearl Harbor
Population: 275,693
Water Systems: 2
Pepeekeo
Population: 1,510
Water Systems: 2
Pmrf Housing
Population: 1,200
Water Systems: 1
Princeville
Population: 6,911
Water Systems: 1
Punaluu
Population: 200
Water Systems: 1
Puuwaawaa Ranch Dho
Population: 468
Water Systems: 1
Salt Lake
Population: 6,406
Water Systems: 1
South Kohala
Population: 9,862
Water Systems: 2
South Kona
Population: 6,512
Water Systems: 1
Sunset Beach
Population: 4,916
Water Systems: 1
Ualapue
Population: 1,119
Water Systems: 1
Wahiawa
Population: 7,740
Water Systems: 4
Waialua
Population: 5,263
Water Systems: 4
Waianae
Population: 74,245
Water Systems: 2
Waikii Ranch
Population: 102
Water Systems: 1
Waikoloa
Population: 12,100
Water Systems: 1
Wailea
Population: 201
Water Systems: 1
Wailuku
Population: 74,511
Water Systems: 1
Wainiha
Population: 416
Water Systems: 1
Waiohinu
Population: 1,474
Water Systems: 1
Waipahu
Population: 74,689
Water Systems: 3
Waipio
Population: 11,516
Water Systems: 1
Windward
Population: 210,463
Water Systems: 1