Placing an Aqueduct

Just a question that popped out of my head: How would you then balance the Roman Bath?

A +4 Housing, +1 Amenity that still gives the land yield is pretty OP. Same for a building, which essentially frees up a tile. But more importantly, those would actually be purchaseable (directly for a building, indirectly with land improvement via Builders).
 
I'd just add the water mill to the aqueduct/baths, if it isn't available in the city-centre.
 
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