More typically, if something turns up, its the seller's problem to cure it.Jon

Yes they are legal, it is on the HUD 1, loans taken subject to existing financing.Not for newbiesyou need capital to cure the note if called. 

Pay them a fee to determine the market discount that'll be needed to cure the issue.

The first time one is issued, it is a Notice to Vacate, which gives the tenant 7-days to cure or 15-days to move.  

Give them a cure or quit notice.  

You could easily cure this by having no specified space.

You could then give them a 3 day notice to cure/comply or quit (or however it's done in New Jersey), meaning pay the water bill in the next three days or move, because you're in breach of contract.

Um, sounds to me like you were SERIOUSLY snooping.However, what you can do is give them a 3 day notice to cure or quit, or whatever that version is in VA.  

Non-payment of rent CAN be cured by simply paying the rent.

the mold remediation specialist is right. concrete does take years to cure, which can result in moisture on the surfaces of concrete. as such, any carpet on the concrete slab would eventually cause mold. however, you stated that the floor is tile, so, that would not be an issue. 65% is kind of high for humidity, and given the fact that they have too much stuff in the place, that gives the mold spores something to feed on. consequently, they are causing their own problem. since no one else had such a problem prior to them moving in, common sense says that they are the problem. i would offer them a buy out on their lease and send them packing