Moist crawl space (San Diego, CA)

[Edita D.]

Hey guys!

Tenant reported water on his floor, that was coming "from the walls", as he thinks, and on the floor underneath the oven and fridge.

We sent a plumber, and he wasn't able to identify the source of a problem. Plumber stated problem is outside of his expertise, since the only thing he noticed was a very MOIST crawl space underneath the cottage, all over, as if after a rain. Problem is, it hasn't rained in San Diego (this happened a week ago) in like 3 months!!! Why is the crawl space so moist? Plumber has no idea. He noticed no sewer smell, no puddles in the crawl space, nothing alarming.

Could it be a leaky irrigation? I do not know which vendor to call now to see what's going on! 

Please, advise!

Thanks!