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The mutants at the watershed need dirt-naps. Makes my shadow grow. You slice 'em and rewards run to you. Info, too.Set

Destroy the Super Mutants at the Watershed is a side quest in Fallout.

Quick walkthrough

Side Quest: Destroy the Super Mutants at the Watershed
Talk to Set and take the work he offers (optional).
Kill all the super mutants at the Watershed or convince them to leave.
Report back to Set for your reward.
Normal
Garret likes you
Garret really likes you
Reward: 40 bottle caps
4 Nuka-Cola
4 flares
Reward: 50 bottle caps
1 shotgun
40 12 gauge shotgun shell
Reward: 200 bottle caps
1 shotgun
40 12 gauge shotgun shell
40 bottle caps
4 Nuka-Cola
4 flares

Detailed walkthrough

The Vault Dweller must start this quest before 110 game days have passed (by March 25, 2162), or all the ghouls in Necropolis will have been killed by the super mutants of the Master. If the Vault Dweller has killed the Master before this time, the ghouls in Necropolis will remain there forever. If not, they will die after 30 days.

If the Vault Dweller talks to Set in the evening, he will give them the opportunity to work for him, promising a reward and additional information. He tasks the Vault Dweller with killing the super mutants who are controlling and rationing the water supply in the Watershed area. Alternatively, The Vault Dweller may travel to the Watershed beforehand and deal with the super mutants first, then ask Set for payment afterward.

The Vault Dweller must travel to the Watershed through the sewers. There are a total of six super mutants in the area, including Harry, who is the most heavily armed. Larry is located outside on the street, while Harry, Sally, Gary, and Barry are located in the watershed building itself. Additionally, Terry is located in a small building to the south of the watershed. All six of them must be killed in order to progress the quest. Alternatively, if the military base has been destroyed before speaking to Harry, it is possible to order him and his super mutants to leave Necropolis peacefully, as long as Charisma and Speech checks are passed.

Once the super mutants have been dealt with, the Vault Dweller must return to Set in the evening to receive a reward from Garret, the quality of which depends on Garret's disposition towards the Vault Dweller. If the Vault Dweller then asks Set for the additional information he promised, he will warn them to tread lightly as he could turn hostile for it; in which case they would have to fight all of his ghouls.

Rewards

Normal:

If Garret likes the Vault Dweller:

If Garret really likes the Vault Dweller:

  • 200 bottle caps
  • One shotgun
  • 40 12 gauge shotgun shell
  • Four Nuka-Cola
  • Four flares

Notes

  • The Children of the Cathedral members in the Watershed area will flee once the super mutants are dead.
  • Looting the fridge from which Garret retrieves the reward will make him state, upon waddling to the fridge, that some things are missing. In that case, no extra items are given.
  • When the Vault Dweller kills the super mutants and talks to Set, Garret will go to give the rewards. However, even if the Vault Dweller didn't retrieve the reward, they can tell Set how lousy it is. This action can turn him hostile.
  • If the Vault Dweller completes the quest, then enters the vault to take the water chip, returning to Set will automatically make him hostile saying that the Vault Dweller "vanished the water chip."
  • The quest won't be available after destroying the Master before speaking to Set for the first time.
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