Rural Home With No Septic or Sewage System

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I have been looking at a house that is for sale in rural Mississippi. It does and not have a septic tank. It only has a main drain that's running 'somewhere'. The house is on 1/4 acre which I assume would require it to have a wastewater treatment plant. The elderly owner had lived there for quite some time but she recently died.

Does anyone know if a septic tank can be installed in this situation? What would be the estimated costs? I do have some idea what a wastewater treatment system would cost for this 2/1 1,100 sq/ft. house.