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The water quality site located on the Waiau River is sampled at the E309 Rd Ford. There was considerable mining upstream of this monitoring site, particularly in the Matawai Stream catchment. Large parts of the Waiau River catchment are plantation forest and native scrub.

Large areas of the Waiau catchment are draining pristine native forest. The Sampling area is a deep site with a boulder/cobble bed, located midway on the main stem of the Waiau River.  Water quality data is collected here monthly and macroinvertebrate data annually as part of Environment Southland's...

Waiau River at Tuatapere – Located on the Lowest main stem of the Waiau River, Downstream of the bridge. The river is wide and swift with a cobble bed. This site is monitored by both Environment Southland and NIWA and is one of the original National River Water Quality Network (NRWQN) sites dating b...

Waiau River at Tuatapere – Located on the Lowest main stem of the Waiau River, Downstream of the bridge. The river is wide and swift with a cobble bed. This site is monitored by both Environment Southland and NIWA and is one of the original National River Water Quality Network (NRWQN) sites dating b...

The Waiau River/Waiau Uwha is located in the Waiau-Hurunui zone (WHZ) which covers an area of 6095 km2 and is home to over 11,500 people. The river rises in the Spenser Mountains and flows eastward to the Pacific Ocean. The Waiau River/Waiau Uwha has the second largest catchment (3,310 square kilome...

The Waiau River site at Otoi is a HBRC fresh water quality & ecology monitoring site.

The Waiau Uwha River above the Waiau bridge is located on a tributary as it flows into the Waiau Uwha River near the Waiau township, on the south bank. This site is no longer monitored for recreational water quality. We now monitor in the main stem Waiau Uwha River (Waiau River at Waiau site).

The Waiau Uwha River at Leslie Hills Bridge site is located in a narrow part of a braided river bed. An irrigation intake at this site means swimming is not advised here

The Waiau Uwha River is monitored for both scientific and recreational water quality near Waiau township, immediately upstream of the Waiau Bridge.  The recreational water quality site has recently been moved to the mainstem from a tributary site, therefore there is insufficient data to calculate a...

In 2020 Waikato Regional Council (WRC) transferred the monitoring functions of the Taupō catchment to Tūwharetoa Māori Trust Board (TMTB). This site is now monitored by TMTB. This water quality site on the Waihaha River is located a short distance downstream of the road bridge and public carpark whi...

The Waihao River at Black Hole is a recreational reserve near the Waimate Gorge. This site is monitored for recreational water quality during the summer months only.

This site is currently monitored once a month for toxic algae. Please be advised that toxic algae mats can be extensive at this site. For more information  https://www.ecan.govt.nz/your-region/your-environment/water/swimming-water-quality/toxic-algae/ The Waihao River is primary a hill-fed river in...