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 ranks 48th among all U.S. states for total drinking water violations, out of 51 states tracked. The state has 182 EPA Safe Drinking Water Act violations on record across 119 water systems serving 32 cities. Of those, 44 are health-based violations, meaning a regulated contaminant was measured above the EPA-established safe level. Hawaii's total violation count is 99% below the national average. Water systems in Hawaii serve approximately 1,507,224 people. The most frequently cited contaminants in Hawaii violations include Fecal Coliform, Chlorine, Disinfection Byproducts, Stage 2 DBP, TTHM.

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

Water Quality in Other States

Alabama 13,972 violations Alaska 73,527 violations Arizona 60,414 violations Arkansas 17,031 violations California 39,276 violations Colorado 42,596 violations Connecticut 28,800 violations Delaware 1,242 violations District of Columbia 115 violations Florida 36,335 violations Georgia 32,159 violations Idaho 26,078 violations Illinois 30,544 violations Indiana 18,261 violations Iowa 9,389 violations Kansas 19,480 violations Kentucky 9,427 violations Louisiana 32,039 violations Maine 6,830 violations Maryland 5,321 violations Massachusetts 10,561 violations Michigan 15,820 violations Minnesota 3,784 violations Mississippi 25,296 violations Missouri 25,377 violations Montana 20,202 violations Nebraska 5,134 violations Nevada 8,167 violations New Hampshire 6,968 violations New Jersey 19,332 violations New Mexico 37,115 violations New York 93,834 violations North Carolina 54,399 violations North Dakota 8,431 violations Ohio 61,604 violations Oklahoma 128,472 violations Oregon 0 violations Pennsylvania 199,265 violations Rhode Island 0 violations South Carolina 13,045 violations South Dakota 19,565 violations Tennessee 20,607 violations Texas 263,180 violations Utah 71,655 violations Vermont 12,362 violations Virginia 15,298 violations Washington 54,459 violations West Virginia 81,622 violations Wisconsin 18,533 violations Wyoming 13,783 violations

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.

Verify at epa.gov