I had a bit of a water issue, and now my 141 inhabitants all have significant radiation poisoning. Let's say they were at 50% poisoned ... how long would it take to fix? Is there any technique to speed it (e.g. uplevel my RadAway Production Room)?

1 Answer 1


Once there is sufficient purified water, radiation poisoning will decrease for dwellers in the vault under normal conditions. 50% radiation poisoning will go away in... about 4 to 6 hours. This cannot be sped up, only supplemented with the use of RadAways.

  • This helps, thank you! Quick follow on - does it have to be in the green the whole time you've been away? What if you come back and it's red (but when you shut down, it was green)?
    – aronchick
    Oct 18, 2015 at 1:25
  • I don't actually know, since I've not had it in a middle state for a long period of time. My guess is that the poisoning would slowly increase when in the red but not depleted, but that is, again, just a guess. Oct 18, 2015 at 2:02

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