If you’re curious about rat activity in or around your building, check out the city’s “Rat Information Portal,” featuring an interactive map, which you can use to search your exact building and learn more about current and past rat activity. 

All you have to do is enter your address in the search bar and the tool will tell you when your building was last inspected for rats and whether it passed or failed inspection. 

When inspecting a building for active rodent and mouse activity, the NYC Health Department inspectors look at tracks, fresh droppings, borrows, active runs, fresh gnawing and live or dead rats.