Water Quality in Hawaii
119 water systems • 32 cities • EPA SDWIS Data
119
Water Systems
182
Total Violations
44
Health-Based Violations
1,507,224
Population Served
Overview
Hawaii has 119 active community water systems serving 1,507,224 people. These systems have accumulated 182 EPA Safe Drinking Water Act violations on record, of which 44 are health-based violations (meaning a contaminant exceeded safe levels).
Common contaminants found in violations: Fecal Coliform, Chlorine, Disinfection Byproducts, Stage 2 DBP, TTHM, E. coli, Total Coliform (TCR), Nitrate, Gross Alpha.
Cities with Most Violations in Hawaii
| # | City | Violations | Health-Based | Water Systems | Population |
|---|---|---|---|---|---|
| 1 | Lanai City | 43 | 0 | 1 | 3,200 |
| 2 | Honolulu | 13 | 1 | 15 | 961,760 |
| 3 | Hilo | 10 | 4 | 24 | 118,171 |
| 4 | Lihue | 10 | 0 | 10 | 66,889 |
| 5 | Pearl City | 10 | 5 | 1 | 444 |
| 6 | Anahola | 10 | 10 | 1 | 100 |
| 7 | Wailuku | 9 | 5 | 18 | 142,982 |
| 8 | Kailua-Kona | 7 | 0 | 1 | 1,945 |
| 9 | Maunaloa | 7 | 1 | 3 | 1,580 |
| 10 | Kaneohe Bay | 5 | 0 | 1 | 16,300 |
Largest Cities in Hawaii
| # | City | Population | Violations | Water Systems |
|---|---|---|---|---|
| 1 | Honolulu | 961,760 | 13 | 15 |
| 2 | Wailuku | 142,982 | 9 | 18 |
| 3 | Hilo | 118,171 | 10 | 24 |
| 4 | Jbpph | 73,495 | 3 | 4 |
| 5 | Lihue | 66,889 | 10 | 10 |
| 6 | Schofield Barracks | 56,948 | 4 | 4 |
| 7 | Waikoloa | 25,616 | 3 | 4 |
| 8 | Kaneohe Bay | 16,300 | 5 | 1 |
| 9 | Princeville | 6,911 | 0 | 1 |
| 10 | Laie | 5,577 | 0 | 1 |
All Cities in Hawaii
| City | Population | Violations | Health Violations | Contaminants |
|---|---|---|---|---|
| Honolulu | 961,760 | 13 | 1 | E. coli |
| Wailuku | 142,982 | 9 | 5 | Disinfection Byproducts, Fecal Coliform, Stage 2 DBP |
| Hilo | 118,171 | 10 | 4 | Disinfection Byproducts, Fecal Coliform |
| Jbpph | 73,495 | 3 | 0 | |
| Lihue | 66,889 | 10 | 0 | |
| Schofield Barracks | 56,948 | 4 | 0 | |
| Waikoloa | 25,616 | 3 | 0 | |
| Kaneohe Bay | 16,300 | 5 | 0 | |
| Princeville | 6,911 | 0 | 0 | |
| Laie | 5,577 | 0 | 0 | |
| Pahoa | 4,906 | 0 | 0 | |
| Hawaii National Park | 4,201 | 0 | 0 | |
| Kapalua | 4,200 | 0 | 0 | |
| Lanai City | 3,200 | 43 | 0 | |
| Kaunakakai | 2,953 | 5 | 0 | |
| Kailua-Kona | 1,945 | 7 | 0 | |
| Maunaloa | 1,580 | 7 | 1 | TTHM |
| Kaumakani | 1,271 | 1 | 0 | |
| Makawao | 1,200 | 0 | 0 | |
| Kamuela | 1,145 | 0 | 0 | |
| Hana | 976 | 0 | 0 | |
| Kahului | 726 | 2 | 0 | |
| Kunia | 650 | 4 | 0 | |
| Kailua Kona | 468 | 0 | 0 | |
| Pearl City | 444 | 10 | 5 | Fecal Coliform |
| Wahiawa | 400 | 1 | 0 | |
| Kalaheo | 260 | 0 | 0 | |
| Holualoa | 250 | 1 | 1 | Stage 2 DBP |
| Koloa | 175 | 2 | 0 | |
| Kalaupapa | 110 | 2 | 0 | |
| Beverly Hills | 100 | 1 | 0 | |
| Anahola | 100 | 10 | 10 | Gross Alpha |
Data Sources
Drinking water data from the EPA Safe Drinking Water Information System (SDWIS). Only active community water systems (CWS) serving 100+ people are included.