Understanding North Kona’s Water Supply

Water has always played a quiet but important role in how communities grow in West Hawaiʻi. In North Kona, much of that water comes from the Keauhou aquifer, a natural underground source that supports homes, schools, farms, and local businesses across the region.

On average, about 14 million gallons of water are pumped from the aquifer each day. Even with population growth and development in the area, current usage remains well within the aquifer’s capacity. The state estimates the aquifer’s sustainable yield at around 38 million gallons per day, meaning current pumpage is only about 37% of that level.

Most of the water distributed by the county serves everyday needs. Roughly 53% goes toward residential use, helping supply homes throughout the community. Another 31% supports municipal uses, including schools, public facilities, and local services. Agriculture accounts for about 14%, reflecting the continued importance of farming across Hawaiʻi Island.

While there is still room within the aquifer’s current capacity, long-term planning remains part of the conversation. Studies looking at rainfall patterns and climate trends suggest groundwater recharge, the natural process that refills aquifers, could shift in the future. Some projections estimate recharge levels could decrease between 21% and 53%, depending on rainfall conditions over time.

To better understand these changes, the state has begun an adaptive management plan focused on monitoring the Keauhou aquifer more closely. The initiative includes improved data collection, regular reporting, and the construction of two deep monitoring wells, funded through approximately $4.2 million approved by the state Legislature in 2025.

For many people in Kona, water is simply part of daily life, something that flows quietly behind the scenes. But it also represents an important natural resource that helps support the region’s future. Careful monitoring and thoughtful planning help ensure that North Kona’s water supply can continue to meet the needs of the community while protecting the island’s natural systems.

In a place like Hawaiʻi, conversations about water often come down to balance, supporting growth while caring for the resources that make island life possible.

Source: North Kona’s Primary Aquifer Provides Plenty Of Water — For Now