All water systems in Hawaii
135 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Hnl-Windward-Pearl Harbor Honolulu-windward-pearlharbor · Honolulu County |
631,389 | 0 | 0 | |
|
Waipahu-Ewa-Waianae Waipahu-ewa-waianae · Honolulu County |
217,479 | 0 | 0 | |
|
Wailuku Wailuku · Maui County |
74,511 | 0 | 0 | |
|
Joint Base Pearl Harbor-Hickam Pearl Harbor · Honolulu County |
65,230 | 1 | 1 | |
|
Mililani Mililani Bws · Honolulu County |
50,573 | 0 | 0 | |
|
Hilo Hilo · Hawaii County |
39,477 | 0 | 0 | |
|
Schofield Barracks Honolulu County |
37,920 | 0 | 0 | |
|
Lihue-Kapaa Lihue-kapaa · Kauai County |
34,854 | 0 | 0 | |
|
Makawao Makawao · Maui County |
29,868 | 0 | 0 | |
|
North Kona North Kona · Hawaii County |
29,581 | 1 | 1 | |
|
Wahiawa Honolulu County |
23,348 | 0 | 0 | |
|
Lahaina Lahaina · Maui County |
20,065 | 0 | 0 | |
|
Marine Corps Base Hawaii Kaneohe · Honolulu County |
16,300 | 1 | 0 | |
|
Kalaheo-Koloa Kalaheo · Kauai County |
12,660 | 0 | 0 | |
|
Waikoloa Waikoloa (dho) · Hawaii County |
12,100 | 0 | 0 | |
|
Waipio Heights Waipio · Honolulu County |
11,516 | 0 | 0 | |
|
Waialua-Haleiwa Waialua-haleiwa · Honolulu County |
9,996 | 0 | 0 | |
|
South Kohala South Kohala · Hawaii County |
9,612 | 1 | 0 | |
|
Kaanapali Kaanapali (dho) · Maui County |
8,000 | 0 | 0 | |
|
Upper Kula Kula · Maui County |
7,686 | 0 | 0 | |
|
Fort Shafter Honolulu County |
7,067 | 0 | 0 | |
|
Princeville Princeville (dho) · Kauai County |
6,911 | 0 | 0 | |
|
South Kona South Kona · Hawaii County |
6,512 | 0 | 0 | |
|
Nctams Eastpac Wahiawa · Honolulu County |
6,470 | 0 | 0 | |
|
Olaa-Mountain View Olaa-mt.view · Hawaii County |
6,467 | 0 | 0 | |
|
Aliamanu Salt Lake · Honolulu County |
6,406 | 1 | 1 | |
|
Kekaha-Waimea Kekaha (dow) · Kauai County |
5,998 | 0 | 0 | |
|
Hanapepe-Eleele Hanapepe-eleele (dow) · Kauai County |
5,592 | 0 | 0 | |
|
Laie Water Company Laie · Honolulu County |
5,577 | 0 | 0 | |
|
Tripler Army Medical Cntr Moanalua · Honolulu County |
5,555 | 0 | 0 | |
|
Barbers Point Waipahu-ewa-waianae · Honolulu County |
5,256 | 0 | 0 | |
|
North Kohala North Kohala · Hawaii County |
4,933 | 0 | 0 | |
|
Waialee-Sunset Beach Sunset Beach · Honolulu County |
4,916 | 0 | 0 | |
|
Haina Haina · Hawaii County |
4,563 | 0 | 0 | |
|
Hawaii Volcanoes Nat.park Hvnp (dho) · Hawaii County |
4,201 | 0 | 0 | |
|
Kapalua Kapalua (dho) · Maui County |
4,200 | 0 | 0 | |
|
Kamehameha Schools Kapalama · Honolulu County |
4,000 | 0 | 0 | |
|
Punahou School Manoa · Honolulu County |
4,000 | 0 | 0 | |
|
Kaunakakai Kaunakakai · Maui County |
3,702 | 0 | 0 | |
|
Hawaiian Beaches Hawaiian Shores Dho · Hawaii County |
3,546 | 0 | 0 | |
|
Lower Kula Kula · Maui County |
3,522 | 0 | 0 | |
|
The Queen's Medical Center Downtown Honolulu · Honolulu County |
3,440 | 0 | 0 | |
|
Kilauea Kilauea (dow) · Kauai County |
3,420 | 0 | 0 | |
|
Lanai City Lanai · Maui County |
3,200 | 3 | 1 | |
|
Waiohinu-Naalehu Waiohinu-naalehu · Hawaii County |
2,948 | 0 | 0 | |
|
Sheraton Hotels Honolulu County |
2,830 | 1 | 0 | |
|
Kahuku Kahuku · Honolulu County |
2,730 | 0 | 0 | |
|
Anahola Anahola · Kauai County |
2,473 | 0 | 0 | |
|
Hoolehua Hoolehua · Maui County |
2,400 | 0 | 0 | |
|
Papaikou Papaikou · Hawaii County |
2,203 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Hawaii records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.