The state Department of Energy and Environmental Protection has designated 18 Tree City USAs this year in celebration of Arbor Day.  Danbury has once again made the list, the 28th year.  Brookfield is on the list for the 12th year.  Monroe was named a Tree City fort the 14th year, Ridgefield has made the list for 17 years and Southbury is marking the two decade list.  Wilton has received the designation for 9 years.  To qualify as a Tree City USA, a community must meet four standards.  They are: having a municipal tree program, a tree ordinance, funding for trees, and a celebration of Arbor Day.  Each qualifying community must also be nominated by the State Forester.