A Practice Note providing an overview of US environmental law, including key statutes and regulations that address water discharges, air emissions, environmental impact assessments, hazardous waste, asbestos, contaminated land, environmental liability in land transactions, and environmental due diligence. This Note discusses the Clean Water Act (CWA), Clean Air Act (CAA), National Environmental Policy Act (NEPA), Resource Conservation and Recovery Act (RCRA), Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), and strategies for environmental compliance and liability management.