Or from the pipe that goes from the house to the tank. A water leak
anywhere is sensed by the thirsty roots, and they will attack a wet
spot. To start, Home Depot and Lowes etc have a root killer, blue
crystals that will help. But you need to do some digging and find out
where the water is being found by the tree to really solve this. Start
by seeing if any roots are growing right into the tank's top door(s),
which you should be using for inspection and pumping anyway. Then start
digging up around the pipes until the roots stop getting into the tank.
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