Found a septic line in a crawl space - ABS glued to PVC - I think I know that is not right, but found PVC with this info - and a tag that said “NSF-DWV”. Does this mean that it is Not Sufficient For - DWV? Never seen this before - Help?

NSF is the standard organization formerly known as National Sanitation Foundation.

Special solvent cement is required for transitions between the two types of material and typically only one tradition fitting is allowed between old and new work.

NSF is the National Sanitation Foundation, a standards and regulatory agency.

See this for more information

Thanks guys - will just write up the leak in the pipe and the disparate pipe connections (were about 6 different transitions between different pipe types) and have plumber evaluate.