Hawaii Tap Water Quality

EPA water quality data for 118 community water systems serving 1,507,181+ people in Hawaii. Click any system to see violations, lead testing results, and a safety grade.

Hawaii sources nearly all drinking water from volcanic aquifers recharged by tropical rainfall. Naturally low hardness makes Hawaiian tap water among the softest in the nation. Military fuel leaks near Pearl Harbor's Red Hill facility contaminated the Navy's water system in 2021, raising statewide awareness of groundwater vulnerability.

HNL-WINDWARD-PEARL HARBOR HONOLULU, HI · 631,389 people · Groundwater WAIPAHU-EWA-WAIANAE HONOLULU, HI · 217,479 people · Groundwater WAILUKU WAILUKU, HI · 74,511 people · Surface Water JOINT BASE PEARL HARBOR-HICKAM JBPPH, HI · 65,230 people · Groundwater MILILANI HONOLULU, HI · 50,573 people · Groundwater HILO HILO, HI · 39,477 people · Groundwater SCHOFIELD BARRACKS SCHOFIELD BARRACKS, HI · 37,920 people · Groundwater LIHUE-KAPAA LIHUE, HI · 34,854 people · Surface Water MAKAWAO WAILUKU, HI · 29,868 people · Surface Water NORTH KONA HILO, HI · 29,581 people · Groundwater WAHIAWA HONOLULU, HI · 23,348 people · Groundwater LAHAINA WAILUKU, HI · 20,065 people · Surface Water MARINE CORPS BASE HAWAII KANEOHE BAY, HI · 16,300 people · Groundwater Purchased KALAHEO-KOLOA LIHUE, HI · 12,660 people · Groundwater WAIKOLOA WAIKOLOA, HI · 12,100 people · Groundwater WAIPIO HEIGHTS HONOLULU, HI · 11,516 people · Groundwater WAIALUA-HALEIWA HONOLULU, HI · 9,996 people · Groundwater SOUTH KOHALA HILO, HI · 9,612 people · Surface Water KAANAPALI WAIKOLOA, HI · 8,000 people · Groundwater UPPER KULA WAILUKU, HI · 7,686 people · Surface Water FORT SHAFTER SCHOFIELD BARRACKS, HI · 7,067 people · Groundwater PRINCEVILLE PRINCEVILLE, HI · 6,911 people · Groundwater SOUTH KONA HILO, HI · 6,512 people · Groundwater NCTAMS EASTPAC JBPPH, HI · 6,470 people · Groundwater OLAA-MOUNTAIN VIEW HILO, HI · 6,467 people · Groundwater ALIAMANU SCHOFIELD BARRACKS, HI · 6,406 people · Groundwater Purchased KEKAHA-WAIMEA LIHUE, HI · 5,998 people · Groundwater HANAPEPE-ELEELE LIHUE, HI · 5,592 people · Groundwater LAIE WATER COMPANY LAIE, HI · 5,577 people · Groundwater TRIPLER ARMY MEDICAL CNTR SCHOFIELD BARRACKS, HI · 5,555 people · Groundwater BARBERS POINT WAIKOLOA, HI · 5,256 people · Groundwater NORTH KOHALA HILO, HI · 4,933 people · Groundwater WAIALEE-SUNSET BEACH HONOLULU, HI · 4,916 people · Groundwater HAINA HILO, HI · 4,563 people · Groundwater HAWAII VOLCANOES NAT.PARK HAWAII NATIONAL PARK, HI · 4,201 people · Groundwater KAPALUA KAPALUA, HI · 4,200 people · Groundwater KAMEHAMEHA SCHOOLS HONOLULU, HI · 4,000 people · Groundwater KAUNAKAKAI WAILUKU, HI · 3,702 people · Groundwater HAWAIIAN BEACHES PAHOA, HI · 3,546 people · Groundwater LOWER KULA WAILUKU, HI · 3,522 people · Surface Water THE QUEEN'S MEDICAL CENTER HONOLULU, HI · 3,440 people · Groundwater KILAUEA LIHUE, HI · 3,420 people · Groundwater LANAI CITY LANAI CITY, HI · 3,200 people · Groundwater WAIOHINU-NAALEHU HILO, HI · 2,948 people · Groundwater KAHUKU HONOLULU, HI · 2,730 people · Groundwater ANAHOLA LIHUE, HI · 2,473 people · Groundwater HOOLEHUA KAUNAKAKAI, HI · 2,400 people · Groundwater PAPAIKOU HILO, HI · 2,203 people · Groundwater KAUPULEHU KAILUA-KONA, HI · 1,945 people · Groundwater LALAMILO HILO, HI · 1,895 people · Groundwater PAHOA HILO, HI · 1,885 people · Groundwater DILLINGHAM AIRFIELD HONOLULU, HI · 1,800 people · Groundwater PEPEEKEO HILO, HI · 1,450 people · Groundwater HAWAIIAN SHORES PAHOA, HI · 1,360 people · Groundwater HANA WAILUKU, HI · 1,284 people · Groundwater GAY & ROBINSON KAUMAKANI, HI · 1,271 people · Groundwater PAHALA HILO, HI · 1,226 people · Groundwater HALEAKALA NATIONAL PARK MAKAWAO, HI · 1,200 people · Groundwater PACIFIC MISSILE RANGE FACILITY JBPPH, HI · 1,200 people · Groundwater LAUPAHOEHOE-KAPEHU HILO, HI · 1,169 people · Groundwater UALAPUE WAILUKU, HI · 1,119 people · Groundwater HAWAIIAN OCEAN VIEW ESTATES HILO, HI · 1,000 people · Groundwater MAUNALOA-KALUAKOI MAUNALOA, HI · 1,000 people · Groundwater Purchased HOKU'ULA WATER SYSTEM HI · 1,000 people · Groundwater KOHALA RANCH WATER CO. KAMUELA, HI · 850 people · Groundwater HAENA-WAINIHA LIHUE, HI · 833 people · Groundwater HANA WATER SYSTEMS - SOUTH HANA, HI · 816 people · Groundwater PAAUILO HILO, HI · 716 people · Groundwater KUNIA VILLAGE KUNIA, HI · 650 people · Groundwater HONOMU HILO, HI · 645 people · Groundwater MAHANALUA NUI SUBDIVISON KAHULUI, HI · 606 people · Groundwater CAMP STOVER JBPPH, HI · 595 people · Groundwater Purchased KAWELA PLANTATION KAUNAKAKAI, HI · 553 people · Groundwater KUALAPUU MAUNALOA, HI · 500 people · Groundwater HANALEI LIHUE, HI · 500 people · Groundwater KUKUIHAELE HILO, HI · 483 people · Groundwater NAPUU WATER INC. KAILUA KONA, HI · 468 people · Groundwater WAIAWA CORRECTIONAL FACILITY PEARL CITY, HI · 444 people · Surface Water HAKALAU-WAILEA HILO, HI · 402 people · Groundwater WAIALUA SUGAR PUMP 2 WAHIAWA, HI · 400 people · Groundwater ANAHOLA FARM LOTS LIHUE, HI · 385 people · Groundwater KALAE WAILUKU, HI · 360 people · Groundwater Purchased WAIAHOLE HONOLULU, HI · 300 people · Groundwater KALAPANA HILO, HI · 275 people · Groundwater KEANAE WAILUKU, HI · 270 people · Groundwater OOKALA (DWS) HILO, HI · 264 people · Groundwater KONA WATER SERVICE COMPANY WAIKOLOA, HI · 260 people · Groundwater KEALIA KALAHEO, HI · 260 people · Groundwater NIULII HILO, HI · 254 people · Groundwater KEOPU WATER ASSOCIATION HOLUALOA, HI · 250 people · Groundwater Purchased PUNALU'U HONOLULU, HI · 200 people · Groundwater KAWAIHAE UNIT #1 KAMUELA, HI · 193 people · Groundwater Purchased KAHILI MOUNTAIN PARK KOLOA, HI · 175 people · Groundwater ANINI LIHUE, HI · 174 people · Groundwater Purchased HANA WATER SYSTEMS - NORTH HANA, HI · 160 people · Groundwater NINOLE HILO, HI · 151 people · Groundwater KAHAKULOA WATER CO. WAILUKU, HI · 150 people · Groundwater KALAUPAPA NHP KALAUPAPA, HI · 110 people · Groundwater NAHIKU WAILUKU, HI · 107 people · Groundwater WAIKI'I RANCH KAMUELA, HI · 102 people · Groundwater OLOWALU KAHULUI, HI · 100 people · Groundwater MAUNAOLU PLANTATION WAILUKU, HI · 100 people · Groundwater DILLINGHAM RANCH BEVERLY HILLS, CA · 100 people · Groundwater MOLOAA IRRIGATION COOPERATIVE ANAHOLA, HI · 100 people · Groundwater KAILUA PUUNENE, HI · 90 people · Groundwater KIPU MAUNALOA, HI · 80 people · Groundwater Purchased KULA NANI WAILUKU, HI · 80 people · Surface Water Purchased WOOD VALLEY PAHALA, HI · 75 people · Groundwater KAHUKU AIR BASE KAHUKU, HI · 75 people · Groundwater PEPEEKEO WATER ASSOCIATION HILO, HI · 60 people · Groundwater Purchased WEST KUIAHA MEADOWS WAILUKU, HI · 60 people · Groundwater WOODLANDS AT NUUANU HONOLULU, HI · 48 people · Groundwater Purchased HONOKOHAU WAILUKU, HI · 42 people · Groundwater Purchased BALDWIN RANCH ESTATES PUKALANI, HI · 32 people · Groundwater VILLA ROSE WAILUKU, HI · 30 people · Groundwater MAUI HIGHLANDS WAILUKU, HI · 26 people · Groundwater POAMOHO HONOLULU, HI · 25 people · Groundwater HAIKU TOWN WATER ASSOCIATION, INC. KAHULUI, HI · 20 people · Groundwater