Could you clarify what "UWM" stands for in the context of this question? Assuming it refers to a university or college, the question "Is UWM a dry campus?" is inquiring about whether the institution has policies prohibiting the consumption or possession of alcohol on campus premises.
As a questioner, I would phrase it like this: "Excuse me, I was wondering if UWM has a dry campus policy in place, meaning are there any restrictions on alcohol consumption or possession on campus grounds?" This way, you're politely seeking information and providing context for your question.