About the Asa Waters Mansion The Asa Waters Mansion, built in 1826, is located in the heart of Millbury, MA. Saved from demolition, and having recently undergone major restoration, this estate is now available for weddings, functions, meetings, and cultural events. The "Friends of the Asa Waters Mansion" organization is a non-profit (501.c.3) volunteer committee with a mission to raise funds for the restoration and preservation of this historic site. The Asa Waters Mansion, located at 123 Elm Street in Millbury, Massachusetts, is listed on the National and State Registers of Historic Places.