The Commission regulates 38 privately owned water and sewage treatment utilities that serve suburban, rural, and resort areas throughout the State. The majority of these utilities are located on the neighbor islands. The Commission does not regulate municipal water and wastewater utility services provided by local city and county governments.

Regulated Utilities

Last Updated 1/25/2017. Up-to-date list of all regulated utility providers is available on the DMS “Active Utility Companies Report“.

Utility Service
Hawaii – American Water Company Mauna Lani Operations) Waste
Hawaiian Beaches Water Company, Inc. Water
Kaupulehu Waste Water Company Waste
Kaupulehu Water Company Water
Keauhou Community Services, Inc. Waste
Kona Water Service Company Waste & Water
KRWC Corp. – Kohala Ranch Water Company Water
South Kohala Water Corporation fka South Kohala Wastewater Corp. Waste & Water
Waikoloa Resort Utilities, Inc. dba West Hawaii Utility Company Waste & Water
Waikoloa Sanitary Sewer Company, Inc. dba West Hawaii Sewer Company Waste
Waikoloa Water Company, Inc. dba West Hawaii Water Company Water
Waimea Wastewater Company, Inc. Waste
Utility Service
Aqua Puhi, LLC dba Puhi Sewer & Water Company Waste & Water
HOH Utilities Waste
Kilauea Irrigation Co., Inc. Water
KukuiUla South Shore Community Services LLC Waste
Princeville Utilities Company, Inc. Waste & Water
Utility Service
Lanai Water Co., Inc. Water
Manele Water Resources, LLC Waste
Utility Service
ATC Makena WWTP Services Corp. Waste
Hana Water Company, Inc. Water
Hana Water Resources, Inc. Water
Hawaii Water Service Company, Inc. – Kaanapali Operation Water
Hawaii Water Service Company, Inc. – Pukalani Wastewater District Waste
Kapalua Waste Treatment Company Waste
Kapalua Water Company Water
Kealia Water Company Holdings LLC Water
Launiupoko Irrigation Company, Inc. Water
Launiupoko Water Company, Inc. Water
Olowalu Water Company Water
Utility Service
Molokai Public Utilities, Inc. Water
MOSCO, Inc. Waste
Waiola O Molokai, Inc. Water
Utility Service
Hawaii – American Water Company (Hawaii Kai Operations) Waste
Laie Water Company Water
North Shore Water Company, LLC Water
Punaluu Water & Sanitation Corp. Waste & Water
Turtle Bay Wastewater Treatment, LLC Waste