Quote Originally Posted by Bramborough View Post
Is it persistent over multiple turns? If so, then I don't know.

If you just now noticed it and are still on same turn, then it's probably just "Bad Winter", which will clear up next turn.
That, or check your ruler/governors/generals. I believe, I've seen a trait that adds to squalor.

An unlikely but potential reason is that enemy agents are sabotaging your settlements.