Nope. The backflow I have prevents sewage of any kind and water of any kind
from entering my house.
For example, lets say there is a city sewage problem perhaps due to an abundance
of rainfall. Others up the street from me that do not have a backflow system, may
find water/sewage backing up through their toilets. For me, that won't happen
because the system will close and thereby prevent any back up from getting inside.
During this period, my toilets would not flush and that would be a good thing.
I have smoke detectors and carbon monoxide detecters in my house. I do really
like the gas pack. My range/cookstove and my water heater, are presently gas
but I could easily place an electric range and electric water heater.
Well I guess my house could explode, could catch fire, could fall through the earth,
flood, etc but I think the chances of that happening is rather slim. If I was to be
concerned about any of those things, it would be earthquake.
If the dam breaks, the surrounding towns near me, would be under water in
ten minutes. My neighbor has a boat.