Ah yes, the ADU money grab! New meter, new WASTE WATER account! Roads are starting to flood for displacement, and no funds being diverted for REAL WASTE WATER (drainage).
We added a (what used to be called a) "Master suite" lol back in 2005, making our home a 3 bath. I should have told them it was a home gym with shower. Because i told them it was a BEDROOM, they looked at it as a possible new occupancy, with an added waste water demand. Had it of been "jist a gym", the same occupants would be using the bathroom, at no additional demand. Words to think about when adding on!