Perchlorate anion (ClO4–) is an environmental contaminant whose occurrence is most clearly linked with the use of its salts as an oxidizer in rocket propellants,
fireworks, matches, and highway safety flares. Through accidental releases and improper disposal of materials containing perchlorate salts, perchlorate has entered the
soil, surface water, and groundwater. Its solubility, mobility, and persistence have allowed it to contaminate drinking water in several states throughout the western United States.
United States
