In a significant move for Maui's real estate and development landscape, the County of Maui Department of Water Supply (DWS) will implement a new approach to water meter sizing and demand assessment, effective January 1, 2026. This change, outlined in Ordinance 5759, shifts the focus from the traditional fixture count method to a projection based on daily water usage. The new regulations will apply to all building permit applications and requests for new or expanded water service, significantly impacting developers, contractors, and homeowners across the island.
The shift away from the “Hunter Curve Method,” which determined water needs based on the number of plumbing fixtures, marks a critical update to the County’s water regulations. The old method, in place since 1995, often proved cumbersome and restrictive, especially for projects involving renovations, additions, or the creation of additional dwelling units (Maui Now).
The new method could have a particularly positive impact on homeowners seeking to rebuild after the devastating wildfires of 2023, as the former system presented hurdles to those rebuilding homes (Grassroot Institute of Hawaii). The older fixture count method, based on the outdated Hunter’s Curve, did not accurately reflect modern water-efficient appliances. The updated daily usage model is expected to be more flexible and reflective of actual water consumption.
For businesses and developers, this change may translate to potentially lower upfront costs and reduced delays in obtaining necessary permits. By basing water meter sizes on projected daily use instead of a fixed fixture count, the DWS aims to create a more efficient and responsive system. Careful planning and consultation with qualified plumbing professionals will become key to ensuring compliance and optimizing water usage in new projects.
This update to the water regulations underscores Maui County's commitment to modernizing its infrastructure and supporting sustainable development practices. As the island's business community adapts to this new framework, stakeholders are encouraged to familiarize themselves with the detailed guidelines and consult with the DWS for clarification on specific project requirements.
