Your boss. He should be the primary person responsible for making sure your organization minimizes the disruptions to your work. He may or may not be in a position to personally solve any issues, but at least you have now shared concerns about your work environment with someone "up the chain".

That person could also be a project manager or any other person who is ultimately responsible for deliverables. It IS their job to make sure you deliver. If you are getting constantly blocked for external reasons, they should know and work towards fixing those issues.

I'm in the exact same boat, btw. Good luck.