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Hawaii Water Quality

Water hardness and quality data for 51 cities in Hawaii, USA.

Est. average

44mg/L

2.6 gpg

Hardness level

🟢 Soft

Based on estimates

Cities

51

54 with data

Honolulu

Pop. 350,964

Moderately Hard
60–119 mg/Lgroundwater

PFAS: 5 ppt

Full report →

Aliamanu / Salt Lakes / Foster Village

Unincorporated area

Pop. 38,833

Soft
0–59 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

East Honolulu

Unincorporated area

Pop. 49,914

Soft
0–59 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

Hawai'i Kai

Pop. 30,620

Soft
0–59 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Hilo

Pop. 43,263

Soft
0–59 mg/Lgroundwater

PFAS: 0 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
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kalihi-Palama

Pop. 43,805

Soft
0–59 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kaneohe

Pop. 34,597

Soft
0–59 mg/Lgroundwater

PFAS: 0 ppt

Full report →

Makakilo / Kapolei / Honokai Hale

Pop. 46,389

Hard
120–179 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Makiki / Lower Punchbowl / Tantalus

Pop. 31,434

Soft
0–59 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Pearl City

Pop. 47,698

Soft
0–59 mg/Lreservoir

PFAS: 0.8 ppt

Full report →

Waipahu

Pop. 38,216

Soft
0–59 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

'Ewa Beach

Pop. 16,415

Hard
120–179 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

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Ala Moana - Kaka'ako

Pop. 18,957

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Diamond Head / Kapahulu / Saint Louis Heights

Pop. 19,769

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Downtown

Pop. 12,381

Soft
0–59 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Halawa

Pop. 14,014

Soft
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Halawa Heights

Pop. 13,408

Soft
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Hawaiian Paradise Park

Pop. 11,404

Soft
0–59 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Kahului

Pop. 26,337

Soft
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kailua-Kona

Pop. 11,975

Hard
120–179 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kaimuki

Pop. 20,878

Soft
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Kaka'ako

Pop. 10,673

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Kalihi Valley

Pop. 20,647

Soft
0–59 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kapa'a

Pop. 10,699

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Kapolei

Pop. 15,186

Soft
0–59 mg/Lgroundwater

PFAS: 1.1 ppt

Full report →

Kihei

Pop. 20,881

Soft
0–59 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Koolauloa

Pop. 15,697

Soft
0–59 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Kuliouou - Kalani Iki

Pop. 16,195

Soft
0–59 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Lahaina

Pop. 11,704

Soft
0–59 mg/Lgroundwater

PFAS: 1 ppt

Full report →

Liliha - Kapalama

Pop. 24,953

Soft
0–59 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Makakilo

Pop. 18,248

Soft
0–59 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Makakilo City

Pop. 15,383

Soft
0–59 mg/Lgroundwater

PFAS: 1.2 ppt

Full report →

Manoa

Pop. 23,343

Soft
0–59 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

McCully - Moiliili

Pop. 28,249

Soft
0–59 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Mililani Mauka / Launani Valley

Pop. 18,072

Soft
0–59 mg/Lgroundwater

PFAS: 0.9 ppt

Full report →

Mililani Town

Pop. 27,629

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Mo'ili'ili

Pop. 24,778

Hard
120–179 mg/Lgroundwater

PFAS: 1.4 ppt

Full report →

Nanakuli

Pop. 12,666

Hard
120–179 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Niu Valley

Pop. 19,250

Soft
0–59 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Nuuanu - Punchbowl

Pop. 16,205

Soft
0–59 mg/Lgroundwater

PFAS: 1.3 ppt

Full report →

Palolo

Pop. 12,620

Soft
0–59 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →

Royal Kunia

Pop. 14,525

Soft
0–59 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Schofield Barracks

Pop. 16,370

Soft
0–59 mg/Lgroundwater

PFAS: 0 ppt

Full report →

Village Park

Pop. 11,099

Soft
0–59 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Wahiawa

Pop. 17,821

Soft
0–59 mg/Lgroundwater

PFAS: 1.5 ppt

Full report →

Waianae

Pop. 13,177

Soft
0–59 mg/Lgroundwater

PFAS: 0.6 ppt

Full report →

Waikiki

Pop. 19,862

Soft
0–59 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Wailuku

Pop. 15,313

Hard
120–179 mg/Lreservoir

PFAS: 0 ppt

Full report →

Waimalu

Pop. 13,730

Soft
0–59 mg/Lgroundwater

PFAS: 0.7 ppt

Full report →

Waipio

Pop. 11,674

Soft
0–59 mg/Lgroundwater

PFAS: 0.8 ppt

Full report →