Source: Found naturally but is most common as discharge from industrial aerospace processes. Groundwater contamination is common as it can move easily through soil and does not degrade well.
Water Treatment: https://tdb.epa.gov/tdb/contaminant?id=1176389556
Summary: Perchlorate is an anion formed by the deprotonation of perchloric acid. Thus, it is the conjugate base of perchloric acid. It is a strong oxidizer and may explode when heated. For this reason it is used in rocket fuel, fireworks, ammunition, matches, and even airbags in automobiles. Perchlorate has been used in disinfectants and pesticides. It is highly soluble in water and moves easily through soil and groundwater.
GHS Hazard Statement: H271, H302, GHS03, GHS07