Rhode Island General Laws Title 23. Health and Safety § 23-27.3-122.1.2 § 23-27.3-122.1.2. Notice or orders--Service and content

(1) By any person authorized to serve civil process within the state, by serving a copy of the order or notice personally upon the owner or person responsible or by leaving a copy of the order or notice at the owner or person responsible's last and usual place of abode;  or

(2) By sending the owner or person responsible a copy of the order or notice by regular mail and certified mail, to the last known address of the owner or owners;  or

(3) If the last and usual place of abode of the owner or person responsible is unknown, and a due and diligent search fails to locate the individual, by posting a copy of the order or notice in a conspicuous place on or about the premises in violation.