Rawene Wastewater Treatment Plant: Kaikohe-Hokianga Community, Northland

Rawene is a secondary-level wastewater treatment plant located in the Kaikohe-Hokianga Community, within the Far North District of Northland, New Zealand. The facility serves a population of approximately 1,800 residents, reflecting its role as a small-scale municipal treatment system in a rural coastal area. As a secondary treatment plant, Rawene employs biological processes to reduce organic matter and suspended solids, meeting the standard treatment requirements for New Zealand's small communities. New Zealand's wastewater treatment regulations, governed by the Resource Management Act (RMA), require discharge permits that set conditions to protect receiving water quality. The plant is situated within 10 kilometers of the coast, indicating that treated effluent likely discharges into a coastal or estuarine environment. The Hokianga Harbour, a large natural estuary on the west coast of Northland, is the primary receiving water body. This harbour supports diverse marine life and is culturally significant to local Māori communities. The plant's operation is critical to maintaining water quality in this sensitive coastal ecosystem.

Rawene's treated wastewater discharges into the Hokianga Harbour, a large estuary on the west coast of Northland that drains into the Tasman Sea. The harbour is ecologically sensitive, supporting mangroves, seagrass beds, and a variety of fish and bird species. As a coastal plant, nutrient and pathogen removal is important to prevent eutrophication and protect shellfish beds and recreational waters.