Sewer backups are an emergency and should be reported immediately. Sequim Public Works Department at 152 West Cedar St., or call 360-683-4908. For after hours, weekend, or holiday occurrences call the Call the City of Sequim Police Department at 360-683-5062 or in case of an emergency, call 911. If the cause of the sewer backup is on private property it shall be the responsibility of the owner to have a licensed plumber fix the problem