Sewage backing up into walgreens, pharmacy workers still having to work

My friend works in walgreens in Massachusetts, apparently there has been sewage backing up since Saturday, no bathrooms, no running water and smells like shit. Front of the store is closed, but they're keeping the drive through pharmacy open. This seems illegal, any thoughts? Figure you folks are pretty knowledgeable on labor laws, especially the lack of a bathroom (they're being told to use the gas station across the street)