Hawaii American Water files rate request driven by $41 million in wastewater infrastructure investments
(UI) – On August 2, Hawaii American Water filed a rate adjustment request with the Hawaii Public Utilities Commission (HPUC) for its Hawaii Kai, Mauna Lani, and Waimea wastewater service customers reflecting $41 million in local wastewater infrastructure replacement and upgrades in all three districts.

The request is driven by the need to replace aging infrastructure, provide safe and reliable service, and comply with environmental regulations.
If approved as filed, the requested funds will support infrastructure improvements for treatment plants, collection systems, and pump stations. Examples of these projects include:
- Mauna Lani Effluent Well Rehabilitation Project
- Waimea Wastewater Treatment Plant Clarifier Improvement Project
- Hawaii Kai Pump Station Improvement Project
The last rate adjustments for the systems on the island of Hawaii were September 2003 for Mauna Lani operations and January 2011 for Waimea operations. The company last filed a rate case for the Hawaii Kai system, on the island of Oahu, in 2021 with rates effective July 2022. The current application will fund needed infrastructure improvements and will take effect in the summer of 2025, pending approval by the HPUC.
“We carefully plan investments in our wastewater system to help protect natural resources and the public health and safety of the communities we serve in Honolulu and Hawaii Counties,” said Kevin Tilden, President of California American Water and Hawaii American Water.
“Our approach for long-term, efficient, and consistent investment in our wastewater operations as we manage costs helps us deliver high-quality, affordable and reliable service to our customers.”
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