|The following is based on Fallout Shelter and some details might contradict canon.|
To increase the speed at which water is produced; Place dwellers with better Perception in this room.
Your water demand will go up the more dwellers you have. If its supply runs low, dwellers will start to become irradiated.
The water treatment, like other rooms, gains a production bonus from being connected to another of the same type and level. The room will gain a +2 production bonus for each connected room. Upgrade costs will be 25% cheaper for a double room and about 34% cheaper when upgrading a triple room vs upgrading 3 single rooms.
|Single Room||Double Room||Triple Room|
|Water Treatment Output||8||18||28|
|Water Treatment Storage||50||100||150|
|Water Treatment Station Upgrade Cost||250||375||500|
|Water Treatment Station Output||10||22||34|
|Water Treatment Station 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|
Being the Tier I room for water production, the water treatment facility becomes obsolete once the Water purification room is unlocked at 80 dwellers, which subsequently becomes obsolete once the Nuka-Cola bottler is unlocked at 100 dwellers.