EPA eyes stricter phosphogypsum rule

Apart from the ongoing risks posed by the Florida incident, the Section21 petition raises interesting questions regarding whether TSCASection 21 is the most appropriate or efficient means to address risks. Neither phosphogypsum nor process wastewater is listed on the TSCA inventory. It’s likely that any commercial use of phosphogypsum is included under the identity of calcium sulfate, in which other components (notably the toxic metals discussed in the petition) are considered impurities.