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Basic Tordon and garlon 4 (ester) are both no go for ground water and aquatic, garlon 3 (amine) is listed. Half-life can be long with both too.

Obviously depends on how far from the lake, his view is not worth harming it, but make sure it is a non-mobile agent. Triclopyr(garlon) is common in stump treatments but it can be an amine or ester with the latter iirc being mobile and long half-life. Roundup custom is listed for aquatic zones...