All 41 systems had complete monitoring. 0 reached at least one study comparison level; 41 did not. “Study comparison level” means the dated EPA technical cutoff used in this January 2026 research release. It does not determine household exposure, health risk, or current legal compliance.
Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
System counts in Hawaii
Each count shows how many included water systems reached the named study level.
| Study comparison | Systems reaching level | Water systems included | Percent |
|---|---|---|---|
| PFOA: study level 4.05 ppt (April 2024 EPA level: 4 ppt) | 0 | 41 | 0.0% |
| PFOS: study level 4.05 ppt (April 2024 EPA level: 4 ppt) | 0 | 41 | 0.0% |
| PFHxS: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 41 | 0.0% |
| PFNA: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 41 | 0.0% |
| HFPO-DA: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 41 | 0.0% |
| Hazard Index: study level 1.5 with at least two detected components (April 2024 EPA level: 1) | 0 | 41 | 0.0% |
Community water systems with complete monitoring
Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study comparison |
|---|---|---|---|---|---|
| ALIAMANU | HI0000337 | 6,406 | Ground water purchased | 1 | Below the study levels |
| BARBERS POINT | HI0000355 | 5,256 | Ground water | 1 | Below the study levels |
| FORT SHAFTER | HI0000341 | 7,067 | Ground water | 1 | Below the study levels |
| HANAPEPE-ELEELE | HI0000404 | 5,592 | Ground water | 3 | Below the study levels |
| HAWAII VOLCANOES NAT.PARK | HI0000146 | 4,201 | Ground water | 1 | Below the study levels |
| HAWAIIAN BEACHES | HI0000117 | 3,546 | Ground water | 1 | Below the study levels |
| HILO | HI0000101 | 39,477 | Ground water | 5 | Below the study levels |
| HNL-WINDWARD-PEARL HARBOR | HI0000331 | 631,389 | Ground water | 45 | Below the study levels |
| JOINT BASE PEARL HARBOR-HICKAM | HI0000360 | 65,230 | Ground water | 1 | Below the study levels |
| KAANAPALI | HI0000205 | 8,000 | Ground water | 2 | Below the study levels |
| KALAHEO-KOLOA | HI0000434 | 12,660 | Ground water | 9 | Below the study levels |
| KAMEHAMEHA SCHOOLS | HI0000319 | 4,000 | Ground water | 2 | Below the study levels |
| KAPALUA | HI0000204 | 4,200 | Ground water | 1 | Below the study levels |
| KAUNAKAKAI | HI0000234 | 3,702 | Ground water | 1 | Below the study levels |
| KEANAE | HI0000219 | 270 | Ground water | 1 | Below the study levels |
| KEKAHA-WAIMEA | HI0000406 | 5,998 | Ground water | 6 | Below the study levels |
| KILAUEA | HI0000407 | 3,420 | Ground water | 1 | Below the study levels |
| LAHAINA | HI0000214 | 20,065 | Surface water | 5 | Below the study levels |
| LIHUE-KAPAA | HI0000400 | 34,854 | Surface water | 17 | Below the study levels |
| LOWER KULA | HI0000247 | 3,522 | Surface water | 1 | Below the study levels |
| MAKAWAO | HI0000213 | 29,868 | Surface water | 4 | Below the study levels |
| MARINE CORPS BASE HAWAII | HI0000356 | 16,300 | Ground water purchased | 1 | Below the study levels |
| MILILANI | HI0000367 | 50,573 | Ground water | 3 | Below the study levels |
| NCTAMS EASTPAC | HI0000357 | 6,470 | Ground water | 1 | Below the study levels |
| NORTH KOHALA | HI0000129 | 4,933 | Ground water | 2 | Below the study levels |
| NORTH KONA | HI0000131 | 29,581 | Ground water | 11 | Below the study levels |
| OLAA-MOUNTAIN VIEW | HI0000112 | 6,467 | Ground water | 2 | Below the study levels |
| PRINCEVILLE | HI0000428 | 6,911 | Ground water | 2 | Below the study levels |
| SCHOFIELD BARRACKS | HI0000345 | 37,920 | Ground water | 1 | Below the study levels |
| SOUTH KOHALA | HI0000130 | 9,612 | Surface water | 1 | Below the study levels |
| SOUTH KONA | HI0000132 | 6,512 | Ground water | 4 | Below the study levels |
| THE QUEEN'S MEDICAL CENTER | HI0000312 | 3,440 | Ground water | 1 | Below the study levels |
| TRIPLER ARMY MEDICAL CNTR | HI0000346 | 5,555 | Ground water | 1 | Below the study levels |
| UPPER KULA | HI0000215 | 7,686 | Surface water | 1 | Below the study levels |
| WAHIAWA | HI0000333 | 23,348 | Ground water | 2 | Below the study levels |
| WAIALEE-SUNSET BEACH | HI0000366 | 4,916 | Ground water | 3 | Below the study levels |
| WAIALUA | HI0000332 | 9,996 | Ground water | 1 | Below the study levels |
| WAIKOLOA | HI0000135 | 12,100 | Ground water | 2 | Below the study levels |
| WAILUKU | HI0000212 | 74,511 | Surface water | 11 | Below the study levels |
| WAIPAHU-EWA-WAIANAE | HI0000335 | 217,479 | Ground water | 17 | Below the study levels |
| WAIPIO HEIGHTS | HI0000334 | 11,516 | Ground water | 2 | Below the study levels |
What is included
Each active community water system with complete monitoring is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Hawaii's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.