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copper sulphate for weed control in lakes

I want to know if copper sulphate ⇦ on eBay or Amazon [affil link] can be used to kill weeds in lakes and whether or not it will harm fish, etc. I was told to use this to control the weeds and I wanted to make sure it was safe.

Denise S [last name deleted for privacy by Editor]
- Bay City, Michigan, USA
2001

2001

Yes, copper sulphate is widely used to kill weeds in lakes. We can't ask the fish what they think of it, so 'safe' is a matter of experience and judgement.

I know little about weed control in lakes, but it would surprise me if you did not need a permit from the state EPA before dosing a lake with copper sulphate anyway, so if I were you I would start by contacting them.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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