Irrigation water is not potable, it's not plumbed to the point of use, and no sewage treatment is needed afterward. There's definitely some perverse pricing of

Irrigation water is not potable, it's not plumbed to the point of use, and no sewage treatment is needed afterward. There's definitely some perverse pricing of agriculture use due to the water rights legal framework (e.g. use it or lose it discourages water saving) but tap water and irrigation water are different commodities.