Tanaka ke, Tensei Suru - Ch. 10

[MangaDex]

 

[eng1]

They are the richest noble family and water is too expensive?

 

[Xe11o]

They are the richest noble family and water is too expensive?

I imagine it's rather that it's scarce and they prefer not to be wasteful. Might be a slight mistranslation of environmentally expensive to economically expensive.