ANSI/NSPI 5 American National Standard for Residential In Ground Swimming Pools This standard is a revision of ANSI/NSPI-5 1995, Standard for Residential Inground Swimming Pools, which was first approved by the American National Standard Institute on April 25, 1995 as an American National Standard. This standard was approved December 16, 2002. The effective date is October 1, 2003. The effective date is established by the National Spa and Pool Institute and not by the American National Standards Institute. The objective of this standard is to provide recommended minimum guidelines for the design, equipment, installation, and use of residential inground swimming pools. It is also intended to assist local jurisdictions and other regulatory bodies, where necessary, in the development and promulgation of criteria for residential inground swimming pools.