121 of Connecticut's 169 towns are included in the MS4 General Stormwater Permit. Click here for a map of the towns
. Each of these towns have or are part of an "urbanized area
," which is a designation of the U.S. Census that takes into account population, population density, impervious cover, proximity to urban areas, and other factors.
State and federal institutions that operate their own stormwater system are now also included in the MS4 permit. This includes university campuses, like UConn, state prisons, military bases, hospitals, public housing authorities, office complexes, etc. that have more than one building and an average daily population of 1,000 or more people.