They also found out while pulling permits that their septic system is undersized for the home and the well is less than half the depth of the surrounding wells.

Most inspectors are more than happy to explain this during the inspection if they are not find another inspector.As you progress you may be able to get away with forgoing an inspection as you become seasoned to spot, not only a great deal but also know the major things to look for but in the beginning have patience, keep your systems in place, work the leads and make smart choices....... the deal will come 

First, understand this will start as your curiosity and end up a let down unless you have a system in place which needs to correlate with your cost per acquisition expectation.Questions to ask yourself.  1.

You need to have a good system to bring in deals and good contractors to get the work done.

This keeps the funds in the both the parent and child account low enough that no attorney would spend time on a lawsuit (if it were to happen).It may be a bit of overkill, but as I add more properties and grow the business I will already have a working system.

@Courtney James If I were in your shoes especially in a production based business like wholesaling I would probably get more value and more return for the efforts and money by investing in a system or technology of some kind. 

Definitely growing more confident in forming a system to establish.

There are one with good school systems such as Belmont thats offering a 3 family at the moment and Bedford which has another three family. 

Is there any way to test septic systems? 

If you're not sure what to ask, get an agent who understands multi-family properties to do the digging for you.Like the other gentleman up above suggested, 10% CapEx is a good starting estimate, but you really won't have any idea what you're in for without knowing the age of the major systems, & interior condition of the units.