Welcome to EnviroMapper for Envirofacts, a single point of access to select U.S. EPA environmental data. This Web site provides access to several EPA databases to provide you with information about environmental activities that may affect air, water, and land anywhere in the United States. With Envirofacts, you can learn more about these environmental activities in your area or you can generate maps of environmental information.
For example, I zoomed in on my little corner of Philadelphia and learned that a cluster of dry cleaners represents the majority of  EPA monitored pollutant-causing producers. Zooming out a bit, I did find some type of factory that appears to have been cited with an EPA code violation in 1998. It’s not all that clear because some of the data points are still blank. Understandably, considering the massive amount of data–stored in a variety of formats–that need to be synchronized. Even with these kinks, we give Data.gov TWO BIG THUMBS UP.