What is true regarding the size and material of irrigation water piping installed outside of a building?

The correct choice highlights that irrigation water piping installed outside of a building generally does not fall under the same stringent regulations as potable water systems. While some guidelines and best practices exist, the specific installation of irrigation systems often allows for more flexibility concerning materials and installation methods.

It's important to note that while irrigation piping does have certain recommended practices, such as appropriate sizing and material selection based on the application and local environmental conditions, these are not as heavily governed by municipal codes compared to indoor plumbing systems. This distinction reflects the nature of irrigation systems, which are often designed for non-potable uses such as watering lawns and gardens, rather than for human consumption.

Local jurisdictions may have their own guidelines, but broadly speaking, the requirements for irrigation systems can vary more significantly than those for plumbing that directly affects health and safety, allowing for alternative choices in materials and practices. This contributes to the understanding that irrigation systems are less tightly regulated compared to other plumbing installations.