The United States Environmental Protection Agency (EPA) is investigating iron and steel foundries to identify and quantify hazardous air pollutants (HAPs) emitted from cupolas; electric arc furnaces; and pouring, cooling and shakedown operations of sand mold casting processes. General Motors Corporation, Saginaw Casting Operations (GMC), Saginaw, Michigan was selected by the EPA as the host facility at which to (1) characterize HAP emissions from cupolas that are controlled by wet scrubbers, and (2) assess wet scrubber performance in controlling HAP emissions from cupolas. This report presents the results of a manual emissions testing program to characterize emissions from a cupola and assess the performance of the wet scrubber in controlling HAP emissions. Testing was conducted at the cupola wet scrubber inlet and outlet to determine air emissions of particulate matter (PM) and metal HAPs; and at the cupola wet scrubber outlet to determine organic HAPs consisting of dibenzo-p-dioxins and polychlorinated dibenzodurans (PCDDs/PCDFs) and semi-volatile organic hazardous air pollutants (SVOHAPs), and volatile organic hazardous air pollutants (VOHAPs). The data may be used by the EPA as potential Maximum Achievable Control Technology (MACT) floor technology for cupolas.