University of Maryland Extension

Should I use a chemical to remove tree roots?

NO! You must always keep in mind whatever chemical you flush down your drains or put into your septic tank, you are DIRECTLY POURING INTO YOUR DRINKING WATER!! Your septic system dumps it's wastewater, and all the chemicals you have flushed into it, directly into ground water. This is the water you drink! And if you have a well in your yard for your drinking water (which most people on septic systems do), you are pouring chemicals into that well. The offending trees should be removed, along with mechanical removal of the roots.

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