Hawaii Drinking Water Compliance Records
118 water systems serving 1,507,181 people. 401 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
113
96%
B
5
4%
C
0
0%
D
0
0%
F
0
0%
118
Water Systems
1,507,181
Population Served
401
Historical Records
124
Health-Based (All Years)
Systems With the Most Recent EPA Records
LANAI CITY
3,200 served6 historical records2 recent
B
KUALAPUU
500 served12 historical records1 recent
B
MAUNALOA-KALUAKOI
1,000 served29 historical records1 recent
B
KALAUPAPA NHP
110 served11 historical records1 recent
B
SOUTH KOHALA
9,612 served26 historical records1 recent
B
UPPER KULA
7,686 served27 historical records
A
HANA
1,284 served1 historical record
A
HONOKOHAU
42 served22 historical records
A
KEANAE
270 served4 historical records
A
NAHIKU
107 served4 historical records
A
Large Systems With No Recent Records
HNL-WINDWARD-PEARL HARBOR
631,389 served33 historical records
A
WAIPAHU-EWA-WAIANAE
217,479 served0 historical records
A
WAILUKU
74,511 served2 historical records
A
JOINT BASE PEARL HARBOR-HICKAM
65,230 served1 historical record
A
MILILANI
50,573 served0 historical records
A
HILO
39,477 served14 historical records
A
SCHOFIELD BARRACKS
37,920 served2 historical records
A
LIHUE-KAPAA
34,854 served8 historical records
A
MAKAWAO
29,868 served37 historical records
A
NORTH KONA
29,581 served1 historical record
A
Largest Water Systems in Hawaii
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| HNL-WINDWARD-PEARL HARBOR | A | 631,389 | 33 |
| WAIPAHU-EWA-WAIANAE | A | 217,479 | 0 |
| WAILUKU | A | 74,511 | 2 |
| JOINT BASE PEARL HARBOR-HICKAM | A | 65,230 | 1 |
| MILILANI | A | 50,573 | 0 |
| HILO | A | 39,477 | 14 |
| SCHOFIELD BARRACKS | A | 37,920 | 2 |
| LIHUE-KAPAA | A | 34,854 | 8 |
| MAKAWAO | A | 29,868 | 37 |
| NORTH KONA | A | 29,581 | 1 |
| WAHIAWA | A | 23,348 | 0 |
| LAHAINA | A | 20,065 | 28 |
| MARINE CORPS BASE HAWAII | A | 16,300 | 1 |
| KALAHEO-KOLOA | A | 12,660 | 0 |
| WAIKOLOA | A | 12,100 | 1 |
| WAIPIO HEIGHTS | A | 11,516 | 0 |
| WAIALUA-HALEIWA | A | 9,996 | 0 |
| SOUTH KOHALA | B | 9,612 | 26 |
| KAANAPALI | A | 8,000 | 2 |
| UPPER KULA | A | 7,686 | 27 |
Contaminants in Hawaii
Lead in HawaiiArsenic in HawaiiNitrate in HawaiiFluoride in HawaiiPFOS in HawaiiPFOA in HawaiiTHMs in HawaiiHAA5 in Hawaii
Cities in Hawaii
HONOLULU(15)HONOLULU-WINDWARD-PEARLHARBOR(1)WAIPAHU-EWA-WAIANAE(2)WAILUKU(18)HILO(24)JBPPH(4)LIHUE(10)PEARL HARBOR(1)SCHOFIELD BARRACKS(4)MILILANI BWS(1)LIHUE-KAPAA(1)MAKAWAO(4)NORTH KONA(1)WAIKOLOA(4)LAHAINA(2)KANEOHE BAY(1)KANEOHE(1)KALAHEO(2)KULA(4)WAIKOLOA (DHO)(1)WAIPIO(1)WAIALUA-HALEIWA(4)SOUTH KOHALA(1)WAHIAWA(5)KAANAPALI (DHO)(1)PRINCEVILLE(1)PRINCEVILLE (DHO)(1)PAHOA(3)KAUNAKAKAI(3)SOUTH KONA(1)OLAA-MT.VIEW(1)SALT LAKE(1)KEKAHA (DOW)(1)HANAPEPE-ELEELE (DOW)(1)LAIE(1)MOANALUA(1)NORTH KOHALA(1)SUNSET BEACH(1)HAWAIIAN SHORES DHO(2)HAINA(1)HAWAII NATIONAL PARK(1)HVNP (DHO)(1)KAPALUA(1)KAPALUA (DHO)(1)KAPALAMA(1)KONA(4)DOWNTOWN HONOLULU(1)KILAUEA (DOW)(1)LANAI(1)WAIOHINU-NAALEHU(1)KAHUKU(2)ANAHOLA(2)HOOLEHUA(1)HANA(3)PAPAIKOU(1)KAILUA-KONA(1)LALAMILO(1)MOKULEIA(1)MAUNALOA(3)PEPEEKEO(2)PAHALA(2)KAUMAKANI(1)PMRF HOUSING (DHO)(1)LAUPAHOEHOE(1)KAMUELA(3)UALAPUE(1)MAUNALOA, MOLOKAI(1)KOHALA JOINT VENTURE(1)HAENA-WAINIHA(1)KEOLA HANA-HOTEL DHO(1)KAHULUI(3)PAAUILO(1)HANALEI (DOW)(2)KUNIA(1)HONOMU(1)MAHANALUA NUI(1)KAWELA(1)KUALAPUU(1)KUKUIHAELE(1)KAILUA KONA(1)PUUWAAWAA RANCH DHO(1)PEARL CITY(1)WAIPAHU(1)HAKALAU-WAILEA(1)ANAHOLA FARM LOTS (DHO)(1)MAKENA(1)KAHANA VALLEY(1)KALAPANA (DWS)(1)KEANAE (DWS)(1)OOKALA(1)KEALIA (DHO)(1)NIULII(1)HOLUALOA(1)PUNALUU (DHO)(1)KAWAIHAE(1)HAIKU(3)KOLOA(1)KAHILI MOUNTAIN PARK(1)KAELEKU AG PARK HANA(1)NINOLE(1)