The Signal Word/Toxicity Class is Danger.
This pesticide is toxic to fish.
It is nonpersistent and rapidly degraded by microbes to carbon, hydrogen, and oxygen (Simsiman 1976). It has short persistence and does not bioaccumulate, does not form toxic metabolites, or require detoxification. It has low to intermediate nontarget toxicity at regular application rates, as listed in the following tabulation.
Zebra Mussel Chemical Control Guide