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The Matau Stream is a small stream that flows through farmland in the eastern hill country. It is one of many tributaries of the Waitara River, joining the Waitara approximately 100 kilometres from the coast. Water quality has been monitored at this site since 2022, and macroinvertebrates have been...

The Mataura River catchment is the region’s second largest. It extends from the southern tip of Lake Wakatipu to the Toetoes Estuary, east of Invercargill. The Waikaia River is the main tributary, contributing half the flow of the catchment above its confluence with the Mataura, east of Riversdale.

Mataura River at Mataura Island Bridge- Located within the Lower Mataura catchment, this monitoring site  has a wide, gravel bed with willow-lined banks. Macroinvertebrate samples are collected here annually by both Environment Southland and NIWA and river water quality samples monthly by Environmen...

Mataura River at Parawa – Located within the Upper Mataura catchment, adjacent to pastoral farming this section of river has a cobble/gravel bed. This site was monitored by NIWA up until January 2016 and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989. I...

This site was monitored by NIWA until March 2024 and is one of the original National River Water Quality Network (NRWQN) sites, with records dating back to 1989. A range of water quality and flow instrumentations is tested at this site. 

The Matukituki River rises in Mount Aspiring National park and flows for 30 kilometres into the southwestern edge of Lake Wanaka at West Wanaka bridge. It has a catchment area of 800 km2.   The immediate catchment is a cool forest scrub comprising of bracken and beech forest, and pastureland for gra...

Mill Creek is a spring fed stream on the southern side of the Wairau River. Nearly no native vegetation remains in the catchment and water quality is impacted by pastoral land use, but large parts of the pasture is being converted to vineyards. The sampling  site is located on private property...

The water quality site located on the Mokaurarua Stream (Puketotara) is accessed upstream of the Ormsby Road bridge. The upper catchment starts in native bush in Pirongia Forest Park flowing through exotic plantation and agricultural land to the monitoring site. 

The Mohaka is one of the largest catchments in the region, draining 2,400 km2. The river’s headwaters extend to the Volcanic Plateau near Taupō.

This site is monitored by HBRC as part of the freshwater quality and ecology monitoring programme. It was monitored by NIWA until September 2017 and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989.

The Mohaka River D/S Taharua River Confluence site is a HBRC fresh water quality & ecology monitoring site

The site on the Mohaka River downstream of the Waipunga River confluence site is a HBRC fresh water quality and ecology monitoring site.