Overview
EWG's drinking water quality report for Hawaii shows results of tests conducted by the water utilities in Hawaii and provided to EWG by the Hawaii Department of Health.
Large utilities in Hawaii
Below are utilities in Hawaii serving over 10,000 people, listed alphabetically.
| Utility | Location | People Served |
|---|
| Hilo | Hilo, HI | 39,477 |
| Honolulu-Windward-Pearl Harbor | Honolulu, HI | 631,389 |
| Joint Base Pearl Harbor-Hickam | Jbpph, HI | 65,230 |
| Kalaheo-Koloa | Lihue, HI | 12,660 |
| Lahaina | Wailuku, HI | 20,065 |
| Lihue-Kapaa | Lihue, HI | 34,854 |
| Makawao | Wailuku, HI | 29,868 |
| Marine Corps Base Hawaii | Kaneohe Bay, HI | 16,300 |
| Mililani | Honolulu, HI | 50,573 |
| North Kona | Hilo, HI | 29,581 |
| Schofield Barracks | Schofield Barracks, HI | 37,920 |
| Wahiawa | Honolulu, HI | 23,348 |
| Waikoloa | Waikoloa, HI | 12,100 |
| Wailuku | Wailuku, HI | 74,511 |
| Waipahu-Ewa-Waianae | Honolulu, HI | 217,479 |
| Waipio Heights | Honolulu, HI | 11,516 |
Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Hawaii
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|
| Aliamanu | Schofield Barracks, HI | 6,406 | 1 |
| Joint Base Pearl Harbor-Hickam | Jbpph, HI | 65,230 | 1 |
Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Hawaii
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|
| Joint Base Pearl Harbor-Hickam | Jbpph, HI | 65,230 | 1 |
Contaminants found in Hawaii above health guidelines
| Found above health guidelines | Found | |||
|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served |
| Nitrate & nitrite | 78 | 1,408,533 | 87 | 1,447,623 | ||
| Nitrate | 77 | 1,378,665 | 90 | 1,458,911 | ||
| Chromium (hexavalent) | 24 | 1,343,138 | 24 | 1,343,138 | ||
| Total trihalomethanes (TTHMs) | 94 | 1,337,081 | 99 | 1,396,063 | ||
| Haloacetic acids (HAA9) | 19 | 1,221,550 | 21 | 1,282,119 | ||
| 1,2,3-Trichloropropane | 18 | 1,073,321 | 18 | 1,073,321 | ||
| Bromoform | 67 | 999,283 | 91 | 1,374,829 | ||
| Haloacetic acids (HAA5) | 59 | 966,410 | 60 | 978,510 | ||
| Dibromoacetic acid | 51 | 913,132 | 51 | 913,132 | ||
| Bromochloroacetic acid | 11 | 819,442 | 11 | 819,442 | ||
| Perfluorohexane sulfonate (PFHXS) | 3 | 647,737 | 3 | 647,737 | ||
| Dibromochloromethane | 65 | 390,677 | 77 | 1,320,893 | ||
| Arsenic | 5 | 299,532 | 5 | 299,532 | ||
| Bromodichloromethane | 44 | 262,681 | 44 | 262,681 | ||
| Trichloroacetic acid | 18 | 207,046 | 21 | 854,783 | ||
| Chloroform | 25 | 206,672 | 32 | 240,858 | ||
| Dichloroacetic acid | 15 | 193,767 | 19 | 846,067 | ||
| 1,2-Dibromo-3-chloropropane (DBCP) | 4 | 100,606 | 9 | 363,540 | ||
| Radium, combined (-226 & -228) | 8 | 87,311 | 12 | 747,708 | ||
| Vanadium | 3 | 41,931 | 24 | 1,343,138 | ||
| Tetrachloroethylene (perchloroethylene) | 2 | 23,943 | 2 | 23,943 | ||
| Atrazine | 2 | 980 | 10 | 12,695 |
