Plumbing Code and requirements as it applies to you.  

file:///Users/administrator/Downloads/2015_IPC_CCC_Requirements_Amended.pdf 

Table 1 - Some applications that require a Back Flow Prevention

file:///Users/administrator/Downloads/Table%20609.F.6%20-%20Fixture%20Chart.pdf  

Table 2 - More applications that require a Back Flow Prevention

file:///Users/administrator/Downloads/Table%20-%20608.18.1%20Containment%20Practices.pdf

The following link is a resource manual for all things related to Back Flow.

file:///Users/administrator/Downloads/CAN-CSA%20B64.10-1994-Manual%20for%20the%20Selection,%20Installation,%20Maintenance%20....pdf 

Use the link below to get more information about Louisiana Sanitary Code and Title 51 in regards to Back Flow Prevention and requirements.

https://ldh.la.gov/page/549 Use this link to get more information about Louisiana Sanitary Code and Title 51 in regards to Back Flow Prevention and requirements.