Waterbury Assembly of God is a church located at 101 Prospect Street in Naugatuck. The church was built c. 1900. I think it may have been built originally as a Baptist Church, as described in History of Waterbury and the Naugatuck Valley, Connecticut, Vol. I (1918), by William J. Pape:
Among the citizens living in the Salem society soon after 1800 were a number of Baptists, who first worshipped in the church in Waterbury. In October, 1817, sixty persons living in Salem, Prospect and Bethany were set off from the Waterbury society to organize a new church in the localities indicated. Two meeting-houses were built, one on Fulling Mill Brook, and by December 22, 1819, the second was organized in the Straitsville locality.
It is the one on Fulling Mill Brook which later became the Naugatuck Baptist Church, with a fine church edifice on Prospect Street, in Union City.