Can I be a firefighter with an expunged Public Intoxication on my record?

I was hanging out with some friends at a bar and called a ride to come pick me up. I was hanging out in the parking lot of the bar with my ride when I stupidly decided to urinate behind the bar instead of just going back in. A cop came up from behind me, breathilyzed me, and gave me a public intoxication. I know I was lucky for just the PI and not a Public Urination. I was not taken to jail just left with my ride. I plan on getting it expunged and was wondering if an expunged PI on record would hurt me from fullfilling my dream of being a firefighter. I will be graduating college with above a 3.0 ulatice GPA and have never been in trouble before or plan on getting in trouble again. Any information will help, good or bad.