Nevada’s long, painful history with chemicals known as perchlorates, and its largely successful effort to remove them from drinking water, won’t change, said state health officials, despite the U.S. Environmental Protection Agency’s decision to no longer regulate them.
The chemicals can harm the thyroid and infant brain development. In Nevada they were manufactured for the defense industry in Henderson from the 1950s to the 1990s. But after a devastating explosion and widespread contamination, Nevada moved aggressively to remove them from Lake Mead and other drinking water systems, an effort that is well-funded and which continues, according to this article by the Associated Press.