Officials got word last month that the town will be named a Tree City USA by the National Arbor Day Foundation for the third year, according to Town Administrator Michael McCue. The designation honors communities that are committed to urban forestry, he said. “Participation in the Tree City USA program helps residents feel good about the place they live and work,” the foundation says on its website. “Annual recognition shows visitors and prospective residents that trees, conservation, and the environment are an important part of life in the community.” About 75 Massachusetts cities and towns received the designation last year. To qualify, communities must have a tree department, spend at least $2 per capita on urban forestry, enforce laws protecting public trees, and host an Arbor Day celebration, McCue said.