In 2006, Hawai‘i listed Waipā Stream, after dense hau bush trapped sediment and blocked fish. Today, restoration cut average turbidity by 62% and restored native fish passage

Waipā Stream restoration efforts significantly improved water quality and aquatic habitats. Invasive hau bush removal and feral pig control reduced sediment pollution. Constructed wetlands and riparian revegetation further enhanced stream conditions and native fish populations. Measurable improvements led to the delisting of turbidity and nutrients from impaired waters. Continued community commitment ensures ongoing watershed protection and management for the future.