Perchlorates are regulated by the EPA as drinking-water contaminants, and certain uses may trigger additional disclosure or end-use certification requirements. Importers should confirm whether the specific perchlorate compound and its intended application require any EPA notification or state-level environmental compliance.

Sodium chlorate (NaClO₃) classifies under 282911, while sodium perchlorate (NaClO₄) — which has one additional oxygen atom — falls under the residual 282990 subheading covering perchlorates. The oxidation state of the chlorine atom is the defining chemical distinction.