I'm in South Australia, the driest state on the driest continent, we have a backup desalination plant and water security is common on the political agenda - water is probably as expensive here than most places in the world

"The 2025-26 water use price for commercial customers is now $3.365/kL (or $0.003365 per litre)"

https://www.sawater.com.au/my-account/water-and-sewerage-pri...