Very simple answer, there is no label for your particular use, with the label being the law it makes your application illegal.All ponds leak to some degree so its going somewhere.
1st, the pond is there because I put it there.
2nd, this isn't a "natural" pond, as I have pointed out. Only rain water & snow melt flows into it. Only in the early spring does anything flow out & then it flows about 200' to an accumulation area, never moving from there.
3rd, I learned recently that it was illegal & have not used the product since. But algae is coming back so I need to do something.
What I don't understand is how tons of this product can be sprayed legally. Eventually it rains & washes into somewhere other than where it's intended. Certainly my using a 4# bag illegally in a contained area is dwarfed tons used legally.