No, the testing requirements for registration of an aquatic herbicide are even more restrictive than those applied to products for use on crops and ornamentals, because EPA recognizes the added sensitivity of aquatic ecosystems and the diversity of water uses. The label provides information on the chemical compound(s) comprising the active ingredient(s) of the herbicide, directions for correct use on target plant species, warnings and use restrictions. Selection of the appropriate herbicide requires consideration of the temporary restrictions onwater use that may be required following treatment.  The label will specify timing of any use restrictions to assure protection of people, animals and the environment.

Source: pestfacts.org