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Waihao River at Gum Tree Flat Road (Don's Hole) is a recreational swimming hole in the the Waimate area. This site is monitored for recreational water quality during the summer months only.

The Waihao River At McCullochs Bridge is a slow flowing, relatively deep, hill-fed river in behind Waimate.

The Waihopai is the largest tributary of the Wairau River. The upper catchment is prone to slips, which cause the water to remain turbid for long periods following heavy rainfall. More than 50% of the catchment is covered in Tussock and native bush, but lower areas are predominantly used for pastora...

Located within the town of Kennington, within the small Waihopai catchment draining lowland pastoral farmland. The Waihopai river is slow moving with a macrophyte dominated gravel bed.  Macroinvertebrate samples have been collected annually at this site since 2017.   Water quality samples are also c...

The Waipapa River begins in the Puketi Forest and flows generally southwest to reach the Whakanekeneke River 12 km northwest of Lake Omapere. It then flows into the Waihou River which drains into an arm of the Hokianga Harbour.

This water quality and flow site located on the Waihou River can be accessed via Okauia Springs Road a short distance east of the township of Matamata. The Waihou River is a lowland system and the water clarity at this site is generally quite poor due to significant nutrient enrichment and erosion i...

This site was monitored by NIWA up to 2016, and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989.  The site is now monitored by Waikato Regional Council with data starting in January 2015.

This water quality site located on the upper reaches of the accessed River can be accesed via Whites Road a short distance east of the township of Putaruru. Water samples are collected a short distance upstream of the Whites Road bridge. The upper reaches of the Waihou River are significantly cleane...

The Waihua River at Waihua Valley Road site is a HBRC fresh water quality and ecology monitoring site.

Located in the upper Mataura catchment on the main stem of the Waikaia River, upstream of the bridge at Waikaia.  The gravel and cobble dominated site is locally influenced by pastoral farming and is prone to prolific algal growth, including cyanobacteria blooms. Water quality data is collected here...

Lowest site on the main stem of the Waikaia River, upstream of the confluence with the Mataura River. Water quality data is collected at this site monthly and macroinvertebrate data annually as part of Environment Southland's State of the Environment monitoring.

Top-most site on the Waikaia River. Drains un-developed hill country and is located within pristine native forest. The cobble/gravel dominated site is adjacent to a well used campground at Piano Flat.  Water quality data is collected here monthly and macroinvertebrate data annually as part of Enviro...