The water line has a cutoff valve, but he’s talking about the sewer line. That can flow into the house if it gets backed up.
Of course.
Yeah very few homes are equipped with a black water shutoff.
My bad.
That is one nice thing about having a septic system.
In Rio Rancho, NM, the sewer portion of the monthly water/sewer bill is actually slightly higher than the water portion. It more than doubles your water bill. I'm in the original part of town, and on a 1/2-acre lot with city water, but have a septic tank.