This 2021 UPC Study Guide was developed as a tool for self-study or classroom training to assist the user to better understand the requirements of the Uniform Pluming Code. Although it is quite useful for examination preparation, such as, inspector, certification, contractor, and journeyman, it is not intended to replace the intense study required to be successful for these exams. This text is not intended to replace the Uniform Plumbing Code document. Each new study guide is updated to correspond to the newest code edition.