We found 31 public water systems that could serve the same population as Haena-wainiha (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Lihue-kapaa | Lihue-kapaa | 33,938 | 304 | 5 |
| Wailua-kapaa | Wailua-kapaa | 17,179 | 0 | 0 |
| Kalaheo-koloa | Kalaheo | 12,327 | 163 | 2 |
| Princeville | Princeville | 6,911 | 0 | 1 |
| Kekaha-waimea | Kekaha | 5,840 | 0 | 8 |
| Hanapepe-eleele | Hanapepe-eleele | 5,445 | 0 | 2 |
| Kilauea | Kilauea | 3,330 | 0 | 1 |
| Anahola | Anahola | 2,408 | 0 | 1 |
| Puhi | Puhi | 2,206 | 0 | 0 |
| Kokee State Park | Kokee State Park | 2,000 | 0 | 4 |
| Waimea | Waimea | 1,867 | 0 | 0 |
| Olokele | Olokele | 1,621 | 0 | 0 |
| Gay & Robinson | Kaumakani | 1,271 | 0 | 9 |
| Pacific Missile Range Facility | Pmrf Housing | 1,200 | 0 | 1 |
| Kekaha Dist | Kekaha | 500 | 0 | 0 |
| Kekaha Sugar Company Limited | Mana | 500 | 0 | 0 |
| Hanalei | Hanalei | 487 | 0 | 1 |
| Anahola Farm Lots | Anahola Farm Lots | 385 | 0 | 1 |
| Dow Kalaheo Treatment Plant | Kalaheo | 370 | 0 | 0 |
| Wahiawa | Eleele | 300 | 0 | 0 |
| Polihale State Park | Polihale State Park | 300 | 0 | 0 |
| Kealia | Kealia | 260 | 0 | 0 |
| Kokee Air National Guard | Kokee Afs | 200 | 0 | 0 |
| Gay & Robinson | Kaawanui | 186 | 0 | 0 |
| Anini | Hanalei | 169 | 0 | 0 |
| Kahili Mountain Park | Kahili Mountain Park | 150 | 0 | 0 |
| Pmrf Mainbase | Mainbase | 150 | 0 | 0 |
| Port Allen | Port Allen | 100 | 0 | 0 |
| Moloaa Irrigation Cooperative | Anahola | 47 | 0 | 0 |
| Koloa Grove Farm Co. | Koloa-poipu | 40 | 0 | 0 |
| Moloaa | Anahola | 29 | 0 | 0 |