County · Hawaii
Maui County, Hawaii: drinking water records
This overview covers 14 ZIP codes and 35 community water systems in Maui County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Makawao HI0000213 | 29,868 | 300 | 0 | 1 | 0.9 ppb |
| Wailuku HI0000212 | 74,511 | 720 | 0 | 0 | 0 ppb |
| Lahaina HI0000214 | 20,065 | 575 | 0 | 0 | 0.8 ppb |
| Kaanapali HI0000205 | 8,000 | 120 | 0 | 0 | 0 ppb |
| Upper Kula HI0000215 | 7,686 | 120 | 0 | 0 | 1.7 ppb |
| Kapalua HI0000204 | 4,200 | 60 | 0 | 0 | 0 ppb |
| Kaunakakai HI0000234 | 3,702 | 60 | 0 | 0 | 0.8 ppb |
| Lower Kula HI0000247 | 3,522 | 120 | 0 | 0 | 3.7 ppb |
| Keanae HI0000219 | 270 | 60 | 0 | 0 | 0.7 ppb |
| Lanai City HI0000237 | 3,200 | 0 | 0 | 0 | 0 ppb |
| Hoolehua HI0000230 | 2,400 | 0 | 0 | 0 | 0 ppb |
| Hana HI0000217 | 1,284 | 0 | 0 | 0 | 0 ppb |
| Haleakala National Park HI0000222 | 1,200 | 0 | 0 | 0 | 0 ppb |
| Ualapue HI0000233 | 1,119 | 0 | 0 | 0 | 1 ppb |
| Maunaloa-Kaluakoi HI0000231 | 1,000 | 0 | 0 | 0 | 0 ppb |
| Hana Water Systems - South HI0000201 | 816 | 0 | 0 | 0 | 0 ppb |
| Mahanalua Nui Subdivison HI0000251 | 606 | 0 | 0 | 0 | 0 ppb |
| Kawela Plantation HI0000248 | 553 | 0 | 0 | 0 | 0 ppb |
| Kualapuu HI0000229 | 500 | 0 | 0 | 0 | 0 ppb |
| Kalae HI0000235 | 360 | 0 | 0 | 0 | 1 ppb |
| Hana Water Systems - North HI0000243 | 160 | 0 | 0 | 0 | 0 ppb |
| Kahakuloa Water Co. HI0000249 | 150 | 0 | 0 | 0 | 0 ppb |
| Kalaupapa Nhp HI0000239 | 110 | 0 | 0 | 0 | 0 ppb |
| Nahiku HI0000220 | 107 | 0 | 0 | 0 | 0 ppb |
| Maunaolu Plantation HI0000254 | 100 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Maui County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 96713, 96757.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.