Troubled Waters

Troubled Waters is a side quest in Fallout 4.

Detailed walkthrough
Meet Supervisor White at Graygarden and talk to her to initiate the quest. Alternatively, one can receive this quest by speaking to Preston Garvey, or by listening to Radio Freedom, and it will point the Sole Survivor towards Supervisor White.

Head across the river to the Weston water treatment plant. The outside of the plant is guarded by super mutants, including a super mutant suicider, super mutant skirmisher and mutant hounds, and is often the target of a Brotherhood Vertibird raid. Kill all super mutants guarding the plant.

Enter the plant via the main doors, and go down to the basement via the elevator. This area is inhabited by mirelurks and ten machine gun turrets, however the turrets can be switched off from a single terminal in a room not far from the entrance to the main area. Every enemy inside of the building has a lower defense against energy weapons.

There are five circuit breakers located throughout the facility and four auxiliary pumps that will lower the water level. The main pump will restore water to Graygarden.

After draining the facility, report back to Supervisor White. As a reward the player character will be able to use Graygarden as a permanent settlement.

Quest stages
Niespokojne wody Águas Turbulentas Беспокойные воды Неспокійні води 渾水摸魚