Wastewater rates are regulated by the Hawaii Public Utilities Commission (PUC). All Hawaii American Water customers are charged rates approved by the PUC.

To determine rates, Hawaii American Water and PUC staffs study costs of construction, maintenance, operation, administration and financing. Once the studies are complete, the company and PUC present any differing conclusions before an administrative law judge. Based on the judge’s opinion, the PUC sets the wastewater rates.

Rates and billing frequency vary based on geographic area. In many areas, customers are billed on a flat-rate. Hawaii American Water serves the following Districts - the Hawaii Kai community on O'ahu and Mauna Lani and Waimea on Hawaii Island.

Tariff Schedules and Rates:

Hawaii-Kai wastewater service Tariffs and Rate Schedule
    - Hawaii-Kai 2024 Base Rates including Automatic Power Cost Adjustment Clause (APAC)

Kalahuipua`a Lagoon's wastewater service for the Mauna Lani resort Tariffs and Rate Schedule

Waimea wastewater service for Waimea and the Parker Ranch developments Tariffs and Rate Schedule

Service Area Maps:

Hawaii-Kai Service Area Maps

2021 Hawaii Kai General Rate Case:

Final Order


2024 Hawaii General Rate Case:

Application - In Progress