DWS Contact Information

Phone Number
DWS Customer Service/Billing (808) 270-7730
DWS Laboratory (808) 270-7550
DWS Administration (808) 270-7816
DWS 24 Hour Emergency Hotline
(808) 270-7633
All other DWS Inquiries (808) 270-8046
Hawaii State Dept. of Health Safe Drinking Water Branch (808) 984-2400 Ext 64258
Environmental Protection Agency Safe Drinking Water Hotline (800) 426-4791

Check out our glossary of water-related terms. Here you will find a listing, in alphabetical order, of the Department's most commonly used terms and their definitions.