|The following is based on Fallout Shelter and some details might contradict canon.|
Water treatment rooms create water resources for a vault, and are affected by the Perception stats of residing vault dwellers working within them. These rooms can be built and utilized immediately, and are a crucial element towards maintaining a successful vault.
Vault dwellers with higher Perception stats will produce additional water resources, which is crucial as a vault increases in population, as water demand will continue to rise.
Water treatment rooms will gain a +2 production bonus for each connected room of the same type, with upgrade costs being 25% cheaper for double rooms, and 35% cheaper for triple rooms, all in comparison to building multiple single rooms throughout a vault.
|Single room||Double room||Triple room|
|Water treatment output||8||18||28|
|Water treatment storage||50||100||150|
|Water treatment upgrade cost||250||375||500|
|Water treatment output||10||22||34|
|Water treatment storage||75||150||225|
|Water treatment plant upgrade cost||750||1125||1500|
|Water treatment plant output||12||26||40|
|Water treatment plant storage||100||200||300|