Would I need IRB approval?

I just graduated from undergrad, and I'm starting grad school this August. My new PI wanted me to repurpose my research from last year's conference and take it to another conference meeting in December. The issue now is related to IRB approval. Would I need it? I'm hosting a community-wide lead screening with local environmental non-profits. Typically, consent forms are administered to participants if they wish to include the data in the project. We previously used a generic form provided by the U.S. EPA. Would I need IRB approval to include community data in the project? If so, who would I seek the IRB approval from?