I think if you have water leaking into your van I think you can safely say yes you have a leak
You need to trace the leak it may not necessarily be as obvious as it seems, maybe shower? toilet? If the van is not level it could be coming from any direction.
The obvious area is to remove the pedestal and start from there, it may be just a pipe has dislodged or in my case the tap was cracked,(previous owner didnt drain down over winter, but fixed under warranty)
I assume you are out and about in the van ? If so you could try a mobile engineer if you dont have the tools with you to start dismantling the van. I would also assume your van is under warranty, is it possible to claim on it?