Even though polychlorinated biphenyls (PCBs) have not been manufactured in the U.S. for over forty years, they continue to be present in building materials, including in caulk and joint materials, paint, siding, roofing, and...more
Lead arsenate, a pesticide that was used regularly in orchards until the 1940s, has contributed to lead and arsenic contamination in large swaths (over 100,000 acres) of Central and Eastern Washington. Some former orchards...more