Water Resources – Preserving for Future Generations
The BWS Water Resources Division conducts the planning and outreach needed to provide current and future customers with high quality service at reasonable costs, while protecting the long-term viability of Oʻahu's water resources and enhancing the environment.
Rainfall is Oʻahu's primary water resource for streams and groundwater supply. Healthy watersheds sustain the quality and quantity of Oʻahu's streams and groundwater supplies and we must care, protect and preserve these areas for future generations.
BWS Initiatives
BWS has a number of long-term initiatives in progress to protect these important areas. One of the ways is by entering into watershed partnerships that protect and enhance the watershed through resource management.
The BWS is working to maximize our precious water resources and ensure that Oʻahu's residents have the water resources they need through its Recycled Water Program. The BWS has acquired lands for the Kapolei brackish and Kalaeloa seawater desalination plants and has conducted pilot testing of ultra filtration and reverse osmosis membranes at both sites.
Commonly Asked Topics
BWS Initiatives 
Data & Statistics
Events Calendar
Oʻahu's Water
Water Planning
Updated: 01/05/2026