Environmental monitoring graphs / tables. I couldn't quickly find these datasets on data.govt.nz, but that doesn't mean they're not there: http://graphs.gw.govt.nz/ There is at least no dataset on "groundwater": https://catalogue.data.govt.nz/group/govhack?q=groundwater&sort=score+desc%2C+metadata_modified+desc

tracking GWRC's progress to a few different UN sustainable development goals that are associated with the environment:

* 6 - Clean Water and Sanitation
* 13 - Climate Action
* 14 - Life Below Water
* 15 - Life on Land

Providing historical information on water, air and land quality before and after the sustainability goals have been implemented