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The Mass Fusion disposal site is a location in the Commonwealth in 2287.[1]


A disposal site on the southeast bank of Lake Cochituate, property of Mass Fusion before the Great War. The lake is now little more than a vast irradiated pool, home to a group of super mutants.


The two ponds are highly irradiated, but the lake behind the camp contains normal radiation levels. The barrels that are not in the water, including the ones on the trailer, do not emit radiation, however. A truck with a trailer full of barrels that were not dumped before the bombs fell can be seen between the irradiated ponds.

Notable loot

Related quests


The Mass Fusion disposal site appears only in Fallout 4.



  1. Fallout 4 Vault Dweller's Survival Guide Collector's Edition p. 355: "[5.06] MASS FUSION DISPOSAL SITE
    This was the property of Mass Fusion and used as a disposal site for coolants and other liquids. As much of the poisons were buried at this site, pressure has built up and the irradiated pools around the shores of the lake have bubbling gasses. Be wise: Wear radioactive protective gear at all times. Be perceptive: Locate the steamer trunk in the treehouse to the northeast. Be extra perceptive: There’s a Mini Nuke inside the large tire by the yellow digging machine."
    (Fallout 4 Vault Dweller's Survival Guide)