Copper rates, and carcass dressing percentages. Chronic copper toxicity does not normally occur in humans because of transport systems that regulate absorption and excretion. Autosomal recessive mutations in copper transport proteins can disable these systems, leading to Wilson's disease with copper accumulation and cirrhosis of the liver in persons who have inherited two defective genes. Elevated copper levels have also been linked to worsening symptoms of Alzheimer's disease. In the US, the Occupational Safety and Health Administration (OSHA) has designated a permissible exposure limit (PEL) for copper dust and fumes in the workplace as a time-weighted average (TWA) of 1 mg/m.
Lead and Copper Rule home, the water supplier may leave the sample bottles and sampling instructions with the consumer. EPA was investigated by the Government Accountability Office (GAO) in 2003 following the discovery of higher-than-acceptable copper and lead levels in tap water in the District of Columbia. The GAO reported that EPA had not been collecting copper and lead levels from the states, despite claims that the levels of copper and lead have decreased; data for 72 percent of water systems were missing. EPA may have been lacking data because more resources were being dedicated to lead regulation than lead reporting. Lead and Copper