Honolulu Desalination Plant Secures $109 Million EPA Loan
The new facility will provide 1.7 million gallons of daily drinking water to help secure supply for Honolulu operators.
Updated on Oct. 16, 2026 in Utilities
Live Poll
Do you support investing in seawater desalination plants to improve local water supply reliability?
The U.S. Environmental Protection Agency has awarded a $109 million loan to the Honolulu Board of Water Supply to fund a new seawater desalination plant. This infrastructure project in West Oahu aims to boost drinking water reliability and reduce regional reliance on groundwater.
Why it matters
The project addresses long-term resource risks by diversifying the water supply, a critical operational concern for businesses reliant on stable utility access in Honolulu. The financing terms, including deferred principal payments during construction, allow the board to build this capacity without an immediate spike in service costs.
The EPA is providing a $109 million subordinate lien loan to support the facility. The plant is designed to produce 1.7 million gallons of drinking water daily.
The players
Honolulu Board of Water Supply
The semi-autonomous municipal agency responsible for managing water infrastructure and services for the city and county of Honolulu.
U.S. Environmental Protection Agency
The federal regulatory body that oversees national water quality standards and manages the Water Infrastructure Finance and Innovation Act program.
The details
The plant will utilize a reverse osmosis process, applying high pressure to force seawater through a membrane to separate brine from potable water. Beyond the primary treatment facility, the scope of construction includes the necessary byproduct disposal systems, a recycled water pipeline, and transmission lines to integrate the supply into the local network.
Timeline
October 16, 2026: The EPA officially awarded the loan to the Honolulu Board of Water Supply.
Market Landscape
This project follows the established pattern of federal funding under the Water Infrastructure Finance and Innovation Act to modernize regional utility resilience. It marks a significant shift in Honolulu's utility strategy by prioritizing desalination infrastructure over traditional groundwater reliance.
Operators in West Oahu should monitor construction notices for potential disruptions to local utility access during the pipeline installation phase. The shift toward desalination as a primary supply source may eventually influence long-term rate structures and utility contingency planning.
The takeaway
The move to desalination highlights a regional push for water security that businesses should factor into their site sustainability and risk assessments. Operators should track the Honolulu Board of Water Supply project updates for milestones that could signal potential impacts on service consistency or utility cost structures.
Further reading
For broader context on infrastructure investment, see our Utilities coverage.
Source note: This article includes information reported by Honolulu Star Advertiser.
Live Poll
Do you support investing in seawater desalination plants to improve local water supply reliability?
