Hi, here's a link to an article I wrote back in 2017 in response to Labour's Clean Water Policy. I suggested that if we all paid 1-2c per cubic meter of water we use into an environment restoration fund, large water users would be incentivised to save water and households in Hawke's Bay wouldn't notice any difference as the charge could be offset against targetted rates.
https://www.nzherald.co.nz/hawkes-bay-today/news/xan-harding-lets-all-pay-a-bit-for-water/BUP5CKDCI64W4VQ2YC6JTYHFHM/