PFAS in Hawaii drinking water
EPA's final UCMR 5 data covers 45 public water systems in Hawaii, serving about 1.5 million people. PFAS turned up in 2 of them (4%). 0 averaged above at least one EPA limit at a sampling point.
Every tested system in Hawaii
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Hnl-windward-pearl Harbor · Honolulu | 631,389 | - | - | 1 | Below limits |
| Waipahu-ewa-waianae · Honolulu | 217,479 | - | - | 1 | Below limits |
| Wailuku · Wailuku | 74,511 | - | - | 0 | None found |
| Joint Base Pearl Harbor-hickam · Jbpph | 65,230 | - | - | 0 | None found |
| Mililani · Honolulu | 50,573 | - | - | 0 | None found |
| Hilo · Hilo | 39,477 | - | - | 0 | None found |
| Schofield Barracks · Schofield Barracks | 37,920 | - | - | 0 | None found |
| Lihue-kapaa · Lihue | 34,854 | - | - | 0 | None found |
| Makawao · Wailuku | 29,868 | - | - | 0 | None found |
| North Kona · Hilo | 29,581 | - | - | 0 | None found |
| Wahiawa · Honolulu | 23,348 | - | - | 0 | None found |
| Lahaina · Wailuku | 20,065 | - | - | 0 | None found |
| Marine Corps Base Hawaii · Kaneohe Bay | 16,300 | - | - | 0 | None found |
| Kalaheo-koloa · Lihue | 12,660 | - | - | 0 | None found |
| Waikoloa · Waikoloa | 12,100 | - | - | 0 | None found |
| Waipio Heights · Honolulu | 11,516 | - | - | 0 | None found |
| Waialua · Honolulu | 9,996 | - | - | 0 | None found |
| South Kohala · Hilo | 9,612 | - | - | 0 | None found |
| Kaanapali · Waikoloa | 8,000 | - | - | 0 | None found |
| Upper Kula · Wailuku | 7,686 | - | - | 0 | None found |
| Fort Shafter · Schofield Barracks | 7,067 | - | - | 0 | None found |
| Princeville · Princeville | 6,911 | - | - | 0 | None found |
| South Kona · Hilo | 6,512 | - | - | 0 | None found |
| Nctams Eastpac · Jbpph | 6,470 | - | - | 0 | None found |
| Olaa-mountain View · Hilo | 6,467 | - | - | 0 | None found |
| Aliamanu · Schofield Barracks | 6,406 | - | - | 0 | None found |
| Kekaha-waimea · Lihue | 5,998 | - | - | 0 | None found |
| Hanapepe-eleele · Lihue | 5,592 | - | - | 0 | None found |
| Laie Water Company · Laie | 5,577 | - | - | 0 | None found |
| Tripler Army Medical Cntr · Schofield Barracks | 5,555 | - | - | 0 | None found |
| Barbers Point · Waikoloa | 5,256 | - | - | 0 | None found |
| North Kohala · Hilo | 4,933 | - | - | 0 | None found |
| Waialee-sunset Beach · Honolulu | 4,916 | - | - | 0 | None found |
| Haina · Hilo | 4,563 | - | - | 0 | None found |
| Hawaii Volcanoes Nat.park · Hawaii National Park | 4,201 | - | - | 0 | None found |
| Kapalua · Kapalua | 4,200 | - | - | 0 | None found |
| Kamehameha Schools · Honolulu | 4,000 | - | - | 0 | None found |
| Punahou School · Honolulu | 4,000 | - | - | 0 | None found |
| Kaunakakai · Wailuku | 3,702 | - | - | 0 | None found |
| Hawaiian Beaches · Pahoa | 3,546 | - | - | 0 | None found |
| Lower Kula · Wailuku | 3,522 | - | - | 0 | None found |
| The Queen's Medical Center · Honolulu | 3,440 | - | - | 0 | None found |
| Kilauea · Lihue | 3,420 | - | - | 0 | None found |
| Kohala Ranch Water CO. · Kamuela | 850 | - | - | 0 | None found |
| Keanae · Wailuku | 270 | - | - | 0 | None found |
On a private well in Hawaii?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in Hawaii drinking water: results for 45 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/hawaii/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.