All 44 systems met the sampling requirement for a yearly average. Of those systems, 0 had at least one yearly average above an EPA comparison level and 44 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Hawaii may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Hawaii drinking-water program →
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
System counts in Hawaii
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 0 | 44 | 0.0% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 0 | 44 | 0.0% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 44 | 0.0% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 44 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 44 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 0 | 44 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ALIAMANU | HI0000337 | 6,406 | Ground water purchased | 1 | No available average above comparison levels |
| BARBERS POINT | HI0000355 | 5,256 | Ground water | 1 | No available average above comparison levels |
| FORT SHAFTER | HI0000341 | 7,067 | Ground water | 1 | No available average above comparison levels |
| HAINA | HI0000161 | 4,563 | Ground water | 3 | No available average above comparison levels |
| HANAPEPE-ELEELE | HI0000404 | 5,592 | Ground water | 3 | No available average above comparison levels |
| HAWAII VOLCANOES NAT.PARK | HI0000146 | 4,201 | Ground water | 1 | No available average above comparison levels |
| HAWAIIAN BEACHES | HI0000117 | 3,546 | Ground water | 1 | No available average above comparison levels |
| HILO | HI0000101 | 39,477 | Ground water | 5 | No available average above comparison levels |
| HNL-WINDWARD-PEARL HARBOR | HI0000331 | 631,389 | Ground water | 47 | No available average above comparison levels |
| JOINT BASE PEARL HARBOR-HICKAM | HI0000360 | 65,230 | Ground water | 1 | No available average above comparison levels |
| KAANAPALI | HI0000205 | 8,000 | Ground water | 2 | No available average above comparison levels |
| KALAHEO-KOLOA | HI0000434 | 12,660 | Ground water | 9 | No available average above comparison levels |
| KAMEHAMEHA SCHOOLS | HI0000319 | 4,000 | Ground water | 2 | No available average above comparison levels |
| KAPALUA | HI0000204 | 4,200 | Ground water | 1 | No available average above comparison levels |
| KAUNAKAKAI | HI0000234 | 3,702 | Ground water | 1 | No available average above comparison levels |
| KEANAE | HI0000219 | 270 | Ground water | 1 | No available average above comparison levels |
| KEKAHA-WAIMEA | HI0000406 | 5,998 | Ground water | 6 | No available average above comparison levels |
| KILAUEA | HI0000407 | 3,420 | Ground water | 1 | No available average above comparison levels |
| KOHALA RANCH WATER CO. | HI0000151 | 850 | Ground water | 1 | No available average above comparison levels |
| LAHAINA | HI0000214 | 20,065 | Surface water | 5 | No available average above comparison levels |
| LAIE WATER COMPANY | HI0000325 | 5,577 | Ground water | 2 | No available average above comparison levels |
| LIHUE-KAPAA | HI0000400 | 34,854 | Surface water | 17 | No available average above comparison levels |
| LOWER KULA | HI0000247 | 3,522 | Surface water | 1 | No available average above comparison levels |
| MAKAWAO | HI0000213 | 29,868 | Surface water | 4 | No available average above comparison levels |
| MARINE CORPS BASE HAWAII | HI0000356 | 16,300 | Ground water purchased | 1 | No available average above comparison levels |
| MILILANI | HI0000367 | 50,573 | Ground water | 3 | No available average above comparison levels |
| NCTAMS EASTPAC | HI0000357 | 6,470 | Ground water | 1 | No available average above comparison levels |
| NORTH KOHALA | HI0000129 | 4,933 | Ground water | 2 | No available average above comparison levels |
| NORTH KONA | HI0000131 | 29,581 | Ground water | 11 | No available average above comparison levels |
| OLAA-MOUNTAIN VIEW | HI0000112 | 6,467 | Ground water | 2 | No available average above comparison levels |
| PRINCEVILLE | HI0000428 | 6,911 | Ground water | 2 | No available average above comparison levels |
| SCHOFIELD BARRACKS | HI0000345 | 37,920 | Ground water | 1 | No available average above comparison levels |
| SOUTH KOHALA | HI0000130 | 9,612 | Surface water | 1 | No available average above comparison levels |
| SOUTH KONA | HI0000132 | 6,512 | Ground water | 4 | No available average above comparison levels |
| THE QUEEN'S MEDICAL CENTER | HI0000312 | 3,440 | Ground water | 1 | No available average above comparison levels |
| TRIPLER ARMY MEDICAL CNTR | HI0000346 | 5,555 | Ground water | 1 | No available average above comparison levels |
| UPPER KULA | HI0000215 | 7,686 | Surface water | 1 | No available average above comparison levels |
| WAHIAWA | HI0000333 | 23,348 | Ground water | 2 | No available average above comparison levels |
| WAIALEE-SUNSET BEACH | HI0000366 | 4,916 | Ground water | 3 | No available average above comparison levels |
| WAIALUA | HI0000332 | 9,996 | Ground water | 1 | No available average above comparison levels |
| WAIKOLOA | HI0000135 | 12,100 | Ground water | 2 | No available average above comparison levels |
| WAILUKU | HI0000212 | 74,511 | Surface water | 11 | No available average above comparison levels |
| WAIPAHU-EWA-WAIANAE | HI0000335 | 217,479 | Ground water | 17 | No available average above comparison levels |
| WAIPIO HEIGHTS | HI0000334 | 11,516 | Ground water | 2 | No available average above comparison levels |
What is included
Each active community water system with enough required samples for a yearly average 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.