Greater Wellington Regional Council (GWRC) routinely monitors water quality in two lakes in the Wellington Region, Lake Wairarapa and Lake Onoke. Monitoring in Lake Wairarapa commenced in 1994 and the programme remained largely unchanged until 2012/13 when changes in monitoring frequency and some site locations and variables were implemented (see Cockeram & Perrie 2013 and Cockeram & Perrie 2014). In August 2009, water quality monitoring programmes were established for two additional lakes, Onoke and Waitawa. Monitoring of Lake Onoke is ongoing while monitoring of Lake Waitawa is restricted to 12-month periods every five years (initially in 2009/10 and then again in 2014/15).
In 2011 assessments of ecological condition, based on submerged macrophyte community structure and composition, were introduced for Lakes Kohangapiripiri, Kohangatera and Pounui. Assessments of macrophytes in all three of these lakes, as well as an inaugural assessment in Lake Waitawa, last occurred in early 2016. LakeSPI assessments are planned to occur every five years.
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