Unmanned Aircraft Systems (UASs) are rapidly integrating into civil airspace, raising new safety concerns regarding their design, training, and operations. This study aims to bridge the knowledge gap in civilian unmanned aircraft systems (UAS) safety reporting by reviewing existing UAS safety reporting sources and conducting an analysis of reported incidents. We reviewed the status of UAS safety reporting to compare the recorded information and discuss limitations of the databases. We then focus on the NASA Aviation Safety Reporting System (ASRS) database to identify contributing factors in UAS incidents. Using an enhanced classification framework, we identify key categories influencing the incidents. Our analysis identified trends and contributing factors in reported incidents, ultimately informing safety decisions and highlighting potential challenges in the current reporting system. We found that human error accounts for most incidents, followed by hardware/software failures. Results contribute to a better understanding of operational risks in UAS systems and the effectiveness of using a voluntary reporting system such as the ASRS database.