Perchlorate has been detectable at milligram/liter concentrations in groundwater for decades, and investigations were originally primarily limited to sites where rocket-fuel development or testing had occurred. Other compounds of concern with low-concentration toxicity have been detected at many sites and have dominated the focus of the remedial industry since the 1970s. Once a revised analytical method was developed in 1997 to detect perchlorate concentrations down to 4 µg/L, its widespread presence was recognized at many sites and led perchlorate to claim center stage attention on a national level by the early 2000s. Although perchlorate's early association with military use persists...

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