Here in France it is totally legal to produce your own electricity as you wish and consume it. You have regulations if you try to connect your installation to the grid but you can totally have different circuits.

Waste water is more problematic, with a strong push for new constructions to be connected to the waste management system when doable. Off the grid system here are allowed to but have to follow some regulations, basically to prevent flooding your neighbors with fecal matter when it rains.