So double check with the county on any of those requirements if any.Where does the water come from?

Somebody is getting married so slaughter a goat as part of the feast, in your apartment, your 2nd floor apartment, and then wash the gut's and gore into hallway via a hose tapped to kitchen faucet to "clean up", the CARPETED hallway, carpeted apartment......

This is rent minus mortgage PITI and property management fee 10% (I don't include capital expenses in that calculation since I already set aside a reserve fund and the HVAC and water heater are 5 years old.

Last week, we had an issue with the plumbing in a home we sold.The buyers moved in, used the water, and some areas of the home started flooding.We sent vendors out that same day to investigate and fix the issue.

Was it painful when water heaters had to be replaced or tenants skipped in the middle of the night? 

We have water and gas to heat water and run stove.

The line looks completely dry with growth flaking off; how long has it been since any water has run through the line? 

There is no running water, the plumbing would need to be redone. 

Sits on a deep water ditch/canal.

Sits on a deep water ditch/canal.