Perchlorate is not only naturally occurring chemical, but also can be man-made. Perchlorate is highly soluble in water. The Independence Day fireworks displays are often held over lakes and other bodies of water to minimize the risk of fire. However, by doing this, it can deposit significant amounts of perchlorate into the water like the contamination in Oklahoma wells. Sources of perchlorate range from lightening and certain fertilizers to the perchlorate compounds in rocket fuel and explosives. Some researchers also found that fireworks displays are another source of deposing perchlorate.
Source info: American Chemical Society. "Fireworks Displays Linked To Perchlorate Contamination In Lakes." ScienceDaily, 28 May 2007.
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