We did get a new-in-box big screen TV (50", but about 15 years old), a new water heater, some tools, a couple 8mm video cameras from the 1960s and other random stuff.  

I do not want to start a fire storm, but the state did recently cut offer the water supply for Mountain House, and last I heard they are struggling to find some alternate sources.So for that fact alone, I would be very careful about buying any properties there until they work our their water supply issue.

I couldn't really live in my home due to the fact I basically do not have any running water (or lack of fixtures to facilitate running water).

These would be pure rentals not vacation homes and we wouldn't live in any of these properties.

Third, in my neck of the woods there would be water credit concerns, etc....

One of the units was partially below grade, and water got in and ruined everything.  

Current useful life left for water heaters and furances ?

The boiler heats all 3 units and was reconditioned in 2014..the current seller/owner says that the monthly heat and water bills average out to about $250 a month over the course of the year. 

I understand that the streets are lower and you'd expect the water to go there first, but what I want to know is whether the home itself would be considered to be in that zone for insurance purposes.

Well water or oil heat can affect the property uses as wellI would want to know about enviro hazards, at least any they will fess up too.