use of copper sulfate - Ask Extension
In 2012, we had our basement waterproofed which included new sump pumps and pits.
Last month, we had the sump pumps replaced and in one of the pits, ...
Knowledgebase
use of copper sulfate #781770
Asked February 12, 2022, 3:06 PM EST
In 2012, we had our basement waterproofed which included new sump pumps and pits.
Last month, we had the sump pumps replaced and in one of the pits, the plumber noticed tree roots that had found their way under the foundation and through the weep holes in the pit. They were small in diameter and maybe 18 inches long.
The plumber recommended copper sulfate to kill the roots.
That leads to questions.
The roots are probably from a 40+ year old maple tree. Will copper sulfate kill the tree?
Also, since the sump pump discharge drains into the front yard, will the copper sulfate kill the grass or potentially any trees further down in the yard?
Butler County Ohio
Expert Response
I apologize for the delay.
Regular small doses of copper sulfate over a period of two weeks is a great and inexpensive way to easily control tree root growth in a sewer pipe. In addition copper sulfate does not harm the tree or plant creating the problem.
Take care.
Jen
Regular small doses of copper sulfate over a period of two weeks is a great and inexpensive way to easily control tree root growth in a sewer pipe. In addition copper sulfate does not harm the tree or plant creating the problem.
Take care.
Jen
Part of my original question was not read.
To: "DALE STIMPERT"
Cc:
Sent: Friday February 25 2022 11:06:44AM
Subject: Re: use of copper sulfate (#0051701)
The tree roots were / are in my sump pump pit not a sewer pipe.
The sump pump does not empty into a sewer line.
If I put copper sulfate in the pit to kill the tree roots, the sump pump will pump some of that water out and onto my front lawn.
Will the copper sulfate then kill the grass and / or any trees downstream?
Thanks!
Dale Stimpert
-----------------------------------------
From: "Ask Extension"To: "DALE STIMPERT"
Cc:
Sent: Friday February 25 2022 11:06:44AM
Subject: Re: use of copper sulfate (#0051701)
You are correct and I apologize for being hasty in my response. Copper Sulfate is a registered pesticide, so you must follow the label. To my knowledge, you may only use this product in septic systems. It is extremely toxic to fish and other aquatic wildlife and can runoff into nearby water systems. I would highly recommend reaching out to a licensed plumber, someone licensed to apply pesticide to control tree roots, before making any application in your home.
Best Wishes
Jen
Best Wishes
Jen
