If you are in the construction trades or building maintenance, these books are a "must-have" to stay on top of the latest regulations. Many cities use the International Codes for the basis of their regulations. These are hot off the press 2009 manuals. They can more than pay for themselves by keeping you out of trouble with the local building inspectors.
This companion to the IPC includes provisions for design, installation, and inspection of private sewage disposal systems, and provides flexibility in the development of safe and sanitary systems. This code book is included with the International Plumbing code books, 100-2047-09 and 100-2042-09.