City & County of Honolulu – Sand Island
City & County of Honolulu – Kailua
City & County of Honolulu – Wahiawa
City & County of Honolulu – Honouliuli
City & County of Honolulu – CSM
Kyo-ya Company, Ltd.
Pacific Pipe Company
Kiewit Infrastructure West Co.
Hawaii American Water
County of Kauai-Dept. of Wastewater
Aqua Engineers Inc.
Valley Isle Pumping
Princeville Utilities Company Inc.
Kauai Irrigation Supply
County of Maui – Lahaina
County of Maui – Kihei
South Kohala Water Corp.
Hawaii Water Service Company
Natural Energy Lab of Hawaii
County of Hawaii–Hilo WWTP
Commonwealth Utilities Corporation
American Samoa Power Authority