Many foundation problems have water as a root cause - be that infiltration in a crawl space, drainage around the site, cracked sewer line or water line.

>> Given that the root cause is bad installation, would the HOA share/cover the cost?

Everyone always thinks the answer lies somewhere "out there", when in reality you are the root of all of your own problems. 

The plumber gets there and discovers tree roots in the sewer line so it takes longer than anticipated and your bill comes in at $360.

@JD MartinTrash can depend on neighborhood most of these resort home community’s have valet trash service so I have a bench up front but it’s a trash can that guest put the trash in and they automatically remove it.As far as consumables I only provide starter set of tp soap etc. after that they are own their own to buy supplies I specifically mention that in the check in info.

I'd rather have a root canal. 

The reason this came back is 2 fold: it wasn’t actually killed to start with because he bleach didn’t penetrate like the mold roots did, and the humidity is such that it’s ripe for repopulating.

And try to look for the "root" of the issues that are preventing you from being at the sale you want to be. 

If its the same dated filter I installed at move out I'll charge the tenant for a service of the unit due to the added strain on the system they caused by not following our lease agreement.With your plumbing situation I would include a lease provision that states tenants are responsible for maintaining all plumbing, excluding root intrusion and the like.

Properly functioning sewer lines don't need "maintenance"...My guess is, it's either an old clay pipe with tree root problems (in which case they should replace it, or remove the tree), or it's improperly installed / runs uphill (in which case, it needs replaced).