The Environmental Protection Agency (EPA) has decided not to regulated 11 compounds that were part of its contaminant candidate list (CCL2). The agency determined that “Occurrence information indicates that these 11 contaminants either appear to be nonexistent or have low levels of occurrence at health levels of concern in public water systems and regulating these contaminants does not present a meaningful opportunity for health risk reduction.” The contaminants are:
Dacthal di acid degradate
Dactal mono acid degradate
You can find the full EPA announcement of its determination here. Supporting documents are available here.