Weston Water Treatment Plant

The Weston water treatment plant is a pre-War facility in the Commonwealth infested by mirelurks and super mutants in 2287.

Background
Built in 2051, the Weston water treatment plant was part of a decade-long plan to modernize Boston's aging sanitation systems. The facility was equipped with advanced Mark-VI flood control pumps, which Theodore Marks believes to be the only non-cheap equipment in the facility.

A memo contained on the terminals within the treatment plant implies that it was the source of an outbreak of cholera, potentially a result of aforementioned cheap equipment and general negligence. Prior to the Great War, Saul Arenson was the plant's operations manager and was preparing a press event for their Weston WELLness press initiative. At the same time, Theodore Marks successfully water-proofed the facility's automated turrets, while Emmis was injured in a work accident. Decades after the Great War, rising sea levels overwhelmed and flooded the facility.

Layout
The facility is a water treatment plant with a series of ring-shaped open-air basins containing water on the eastward side. Around and across these basins, super mutants have constructed a series of walkways and are patrolling them. These mutants are armed with rocket launchers and sniper rifles. There is at least one super mutant suicider with a mini nuke. The trailers and shack in the very middle of the basin have floor traps in their entrances, including a tripwire-activated missile launcher. A mattress and two sleepings bags can be used in the shacks outside.

Inside the facility, the Sole Survivor can check the entries of the front office terminal, one of which implies that Nut Island drinking water was poured into empty Weston water bottled cartons during the Weston WELLness media event. This will also update the map with the location of Warwick homestead, the pre-War Nut Island wastewater treatment plant. Around the corner is a toilet with a first aid kit. Next to the stairs is an Advanced locked door with minor loot. The player character can go up to the roof via a ladder, and there is a cache of goodies behind an Expert locked safe and a Novice locked terminal.

Down the elevator, the player character is led to a series of rooms with locked doors. These doors can only be opened by pressing a large red button beside them, and they can only be opened when the button is illuminated red. If the button is not lit, it means the section beyond is flooded. To traverse the level, the player character must activate a series of pumps to drain sections. This will expose the Sole Survivor to attacks from mirelurks that are living in the water treatment plant. The lower levels are also guarded by a total of ten machine gun turrets, however, the Sole Survivor cannot hijack the turrets using the turret override program on the facilities terminal.

Upon exiting the elevator to the lower level, there is a turret to the left and a Novice locked door with some ammo boxes behind it. To the right (the room with the Picket Fences skill book), there is a computer terminal and an Expert locked safe. This terminal gives the option to disable all automated turrets in the section.

The roof can be accessed by a ladder to the left of the elevator and up the stairs on the plant's main level. The roof contains an Expert locked safe and the grounds control terminal, which will disengage the safe lock and control spotlights.

Notable loot

 * Picket Fences issue #5 - In the metal office overlooking the generator room, before descending to the main treatment chamber.
 * Super mutant heavy gauntlets - In the shack to the right of the main entrance of the water plant.
 * Super mutant bladed helmet - On the floor of the highest shack.

Related quests

 * Troubled Waters

Appearances
The Weston water treatment plant appears only in Fallout 4.

Behind the scenes

 * The Weston water treatment plant is based on the real world location of Weston Reservoir, a part of the greater Boston water supply maintained by the Massachusetts Water Resources Authority.
 * The terminal describing the Nut Island drinking water provided at the Weston WELLness event is a reference to the "Nut Island effect," the name given to a phenomenon where skilled employees are led by distracted managers, leading to the team's catastrophic failure. The term was coined in reference to conditions at the Nut Island sewage treatment facility in Quincy, Massachusetts which resulted in a massive sewage spill into the Boston Harbor.

Bugs

 * Be careful with the exit elevator that becomes available when the mission is over. It is possible to get stuck inside permanently, forcing one to reload a previous save.
 * If you're "stuck" (elevator or pump control switch won't work) open console ` and type "coc WestonWaterTreatmentExt" then "resetinterior 6fe2f" without quotes. The alternative is to reload a previous save, however, it seems the elevator and pump control switch won't work until you relaunch the game.
 * On approach it is possible that a Brotherhood of Steel Vertibird will attack the super mutants outside the facility, but the Vertibird will fly into the raised section of highway above the facility repeatedly and then crash.