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- Aloha Petroleum ltd.
- Amerigas Propane
- AT&T
- County of Hawaii Water Service
- County of Hawaii – Traffic
- County of Hawaii – Waste Water
- County of Hawaii – Dept of Water
- County of Kauai – Dept of Water
- County of Maui – Wastewater
- County of Maui – Water
- Heco Fuel Pipelines
- Hana Water Company
- Hana Water Resources
- Hawaii American Water
- Hawaii Electric Light Company
- Hawaii Water Service Company
- Hawaiian Beaches Water Company
- Hawaiian Telcom, Inc.
- Hawaiian Electric Company
- Honolulu Board of Water Supply
- Honolulu Facility Maintenance
- Island Energy Services
- Kalaeloa Water Company
- Kapalua Water & Waste Treatment
- Kauai Island Utility Cooperative
- Kilauea Irrigation Company
- Kona Water Service Company
- Kukui Ula South Shore Community
- Laie Water Company
- Lanai Utilities
- Makena Wastewater Corp.
- Maui Electric Company
- Maui Gas Service
- Mid Pac Petroleum
- Molokai Public Utilities
- Oahu Gas Service
- Time Warner Cable
- Par Hawaii Refining LLC
- Parker Ranch
- Princeville Utilities Co. Inc
- Sandwich Isles Communications
- Signature Flight Support
- South Kohala Wastewater Corporation
- State Of Hawaii Dot
- The Gas Company
- Waimea Center
- Waimea Wastewater Company
- West Hawaii Sewer Company
- West Hawaii Utility Company
- West Hawaii Water Company
- West Maui Land Company
