Gurbacewar ruwa a New Zealand shine ƙara samun matsala ga waɗanda ke amfani da kulawa da hanyoyin ruwa da kuma hukumomin New Zealand . Ƙaruwar yawan jama'a yana da alaƙa da haɓakar gurɓataccen ruwa, saboda dalilai da yawa kamar amfani da filayen karkara, Fresh water quality is under pressure from agriculture, hydropower, urban development, pest invasions and climate change. amfani da masana'antu da ci gaban birane. Kyakkyawan ingancin ruwa yana fuskantar matsin lamba daga noma, wutar lantarki, ci gaban birane, mamayewar kwari da sauyin yanayi. Yayin da aka rage gurɓacewar yanayi daga maɓuɓɓugar ruwa, gurɓataccen gurɓataccen ruwa kamar su abinci mai gina jiki, ƙwayoyin cuta da haɓakar magudanar ruwa da kuma ruwan guguwa a garuruwa ba a ƙarƙashin kulawa. Akwai wuraren kula da ingancin ruwa sama da 800 a kusa da New Zealand waɗanda ake yin samfura akai-akai. As of January 2019[update], Auckland is the region with New Zealand's most polluted waterways, with 62% of rivers and lakes graded poor by the Ministry for the Environment for swimming, and 0% of rivers and lakes graded as good.