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Ablutions is a quest in the Fallout 4 add-on Far Harbor.

Quick walkthroughEdit

Far Harbor quest: Ablutions
Speak to Mai
Travel to Vim! Pop Factory
Locate & take the Regulator
Travel back to the Nucleus
Install the Regulator
Test the Decontamination System

Detailed walkthroughEdit

For this quest, Sister Mai, at The Nucleus, asks the Sole Survivor to acquire a pump regulator to repair the decontamination arches near the entrance. Her directions lead to the Vim! Pop factory which is inhabited by a large number of super mutants and their hounds. The regulator can be found in the Vim factory floor area with the two large mixing vats.

Upon returning to Mai, questioning her about her "repairs" reveals that she is actually attempting to circumvent the decontamination arches' filter systems in order to have them irradiate instead of decontaminate everyone passing through. She then leaves the honor of installing the pump regulator to the Sole Survivor. Reaching the mechanism at the bottom of the submarine dock involves trudging through the dock's heavily irradiated water, so suitable preparation is recommended. With an Intelligence of 7 or higher, the Survivor can opt to reverse Mai's alterations to the system before installing the new regulator, thus making the decontamination arches actually decontaminate as they were meant to do. Return to Mai to claim the unique Radical Conversion radium rifle as just reward regardless of how the quest was resolved.

Quest stagesEdit

StageStatusDescriptionLog Entry
10 Recover the Pump RegulatorSister Mai asked me to recover an industrial-strength pump regulator from the Vim! Pop factory. The place is apparently crawling with Super Mutants, so I'll need to be cautious.
20 Return the Regulator to Sister MaiI found the pump Sister Mai requested. Now to head back and claim my reward.
30 Install the RegulatorMai said I should be the one to do the honors of adding the final piece to decontamination system in the bottom of the bay. I suspect she just doesn't want to walk through all that... filth.
40Quest finishedIcon checkTest the Decontamination SystemI repaired the decontamination arches in the Nucleus like Mai asked, but I also undid Mai's bypass to the decon system. Now to test that it worked. OR
I repaired the decontamination arches in the Nucleus. Now to test that the fix worked.


  • If the quest was completed by reversing Sister Mai's alterations she will later thank the Sole Survivor for the work on the decon arches, commenting "... even if it does refuse to spit rads. Saves folk from scouring I guess."


pcIcon pc ps4Icon ps4 xboxoneIcon xboxone After completing the quest and choosing to reverse the alterations, there is a chance the decontamination arches will not work, only spraying mist, thus not affect the players Rads in any way. On PC the test of the reversed arches during the quest may work fine at first and clear rads but after returning to The Nucleus later on the arches neither clear rads or give rads.[verified]

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