Conducting Business in Watertown
Anyone conducting business in Watertown under a name other than their own or corporate name must file a Business Certificate with the Town Clerk. This form is commonly known as a "doing business as" or "DBA" certificate.

The DBA files allow consumers to identify and locate the proprietor of a business, which goes by a name other than that of the proprietor. The filing of a DBA Certificate also serves as notice that the filer claims the exclusive use of the name contained in the certificate. Once filed, a certificate is valid for four years.

The General Laws of Massachusetts
Read the full text of Massachusetts Law Chapter 110 Section 5 which requires the filing of Business Certificates.