Mobile Home / Septic Tank Question

[John White]

I'm evaluating two mobile home parks with about 70 pads between the two. Both properties have separate electric & water meters but the property is on septic systems. 

I'm not familiar with septic systems. What are the costs associated with them? 

The rent is about $150/pad so I want to make sure I have a good handle on all the costs.

A private sewer is being installed in the area, would it make since to connect or just maintain the septic systems?