General affidavit form for use within the State of Utah. Modify this affidavit to meet your specific needs.Utah Affidavit Templates. Use our Affidavit template to swear to the truthfulness of a statement or fact. I certify that I filed with the court and am serving a copy of this Witness Affidavit on the following people. Subscribed and sworn to before me this ______ day of. _____. Affidavit of Beneficial Use of Water. You may use these sample affidavits or create your own. The first affidavit is in letter format, the second is formatted as a form. Utah Affidavit of Residence Form.