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Hawaii Water Quality

Water hardness and quality data for 44 cities in Hawaii, USA.

46 mg/L

State average

🟢 Soft

Avg category

44

Cities tracked

Honolulu

Pop. 350,964

🟡 Moderately Hard
67.5 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Aliamanu / Salt Lakes / Foster Village

Unincorporated area

Pop. 38,833

🟢 Soft
35 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

East Honolulu

Unincorporated area

Pop. 49,914

🟢 Soft
31 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

Hawai'i Kai

Pop. 30,620

🟢 Soft
56 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Hilo

Pop. 43,263

🟡 Moderately Hard
60.5 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Joint Base Pearl Harbor Hickam

Unincorporated area

Pop. 42,184

🟢 Soft
20 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Kailua

Pop. 38,635

🟢 Soft
42 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kalihi-Palama

Pop. 43,805

🟢 Soft
51.5 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kaneohe

Pop. 34,597

🟡 Moderately Hard
60.5 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Makakilo / Kapolei / Honokai Hale

Pop. 46,389

🟢 Soft
35.5 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Makiki / Lower Punchbowl / Tantalus

Pop. 31,434

🟢 Soft
14.5 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Pearl City

Pop. 47,698

🟢 Soft
32.5 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

Waipahu

Pop. 38,216

🟢 Soft
28 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

'Ewa Beach

Pop. 16,415

🟢 Soft
37.5 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

'Ewa Gentry

Pop. 22,690

🟢 Soft
38 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Airport

Pop. 28,916

🟡 Moderately Hard
63 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Ala Moana - Kaka'ako

Pop. 18,957

🟡 Moderately Hard
66 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Diamond Head / Kapahulu / Saint Louis Heights

Pop. 19,769

🟡 Moderately Hard
64 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Downtown

Pop. 12,381

🟢 Soft
35 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Halawa

Pop. 14,014

🟢 Soft
44.5 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Halawa Heights

Pop. 13,408

🟢 Soft
45 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kahului

Pop. 26,337

🟢 Soft
40 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kaimuki

Pop. 20,878

🟢 Soft
43.5 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kalihi Valley

Pop. 20,647

🟢 Soft
48 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kapolei

Pop. 15,186

🟢 Soft
49 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kihei

Pop. 20,881

🟢 Soft
22 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Koolauloa

Pop. 15,697

🟢 Soft
35.5 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Kuliouou - Kalani Iki

Pop. 16,195

🟢 Soft
57.5 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Liliha - Kapalama

Pop. 24,953

🟢 Soft
16 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Makakilo

Pop. 18,248

🟡 Moderately Hard
75.5 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Makakilo City

Pop. 15,383

🟢 Soft
55 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Manoa

Pop. 23,343

🟢 Soft
14.5 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

McCully - Moiliili

Pop. 28,249

🟢 Soft
20.5 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Mililani Mauka / Launani Valley

Pop. 18,072

🟢 Soft
35 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Mililani Town

Pop. 27,629

🟡 Moderately Hard
67.5 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Mo'ili'ili

Pop. 24,778

🟡 Moderately Hard
69.5 mg/Lgroundwater

PFAS: 1.4 ppt

Full report →

Nanakuli

Pop. 12,666

🟡 Moderately Hard
76 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Niu Valley

Pop. 19,250

🟡 Moderately Hard
79.5 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Nuuanu - Punchbowl

Pop. 16,205

🟡 Moderately Hard
67.5 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Palolo

Pop. 12,620

🟢 Soft
27 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

Royal Kunia

Pop. 14,525

🟡 Moderately Hard
76.5 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Schofield Barracks

Pop. 16,370

🟡 Moderately Hard
76.5 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Wahiawa

Pop. 17,821

🟡 Moderately Hard
77.5 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Waianae

Pop. 13,177

🟢 Soft
15 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Waikiki

Pop. 19,862

🟢 Soft
20 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Wailuku

Pop. 15,313

🟢 Soft
23 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Waimalu

Pop. 13,730

🟢 Soft
24 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →