Some other structures, like a patio and propane tank, are even closer.

You would need to know if you have other options: Is public water and sewer available to tap into, is there enough land with the park to dig a new well or place a new lagoon system is these fail, will the county even let you upgrade or put in a new lagoon system, etc.I have a few parks with septic tanks, none with wells. 

@Jessie Niu I have a post somewhere on the forums detailing the entire process, but basically it had to do with a decomissioned oil tank that the bank was unwilling to remove, so we asked them to give us $50k back at closing to assume the risk(We did soil sample tests and other tests), they settled with lowering the purchase price $50k.

If economy tanks, recession, depression, people can't afford squat, RENTS GO UP. because the demand for the supply will be insane.    

Here are some things to look for from an Insurance prospective:1.Any in-ground tanks (active or inactive)2.Any Knob & Tube or Aluminum Wiring3.If built before 1978, does the building have Lead Safe certifications4.Any wood stoves or secondary heating units.

Your HELOC serves as a holding tank for any future purchases while it saves you significant interest in the process (a return in reverse).

(less than $4000 for the tank and drain field)

It’s not like they misrepresented the age of a hot water tank.

And it sounds like remediation for old petro tanks too!

It's like handing someone a plane, a tank of fuel, and a "Piloting for Dummies" book and wondering why they can't figure out how to fly a plane on their own.