Contaminants of emerging concern (CECs) are broadly defined as any naturally occurring or synthetic chemical species that have not been historically monitored yet present a negative ecological or human health risk when introduced to the environment. There are many sources of CECs to coastal environments, including runoff from agriculture, fire-fighting activities, airports, ports, and wastewater treatment plants (WWTPs). WWTPs are known to act as point sources of these contaminants into the environment via effluent discharges since many WWTPs are not equipped to fully remove these and other contaminants. Advanced WWTP technologies focus on the removal of these and other contaminants from effluent waters through various means. Electrocoagulation is the process of applying electricity to water through sacrificial electrodes that generate coagulants, capturing chemical species into flocculants that are removed via filtration. Two separate electrocoagulation electrodes were tested in this study – iron and aluminum. In total, 82 individual contaminants from the following CEC and CKC (Contaminants of Known Concern) compound classes were characterized: polychlorinated biphenyls (PCBs), phosphorus flame retardants (PFRs), and organochlorine pesticides (OCPs). All groups were characterized via gas chromatography / mass spectroscopy (GC/MS) from WWTP effluent that is discharged into Tampa Bay, Florida. Iron electrode electrocoagulation treatment removed 85% of PCBs and 53% of OCPs from effluent waters, while aluminum electrodes removed 100% of PCBs and 44% of OCPs from effluent waters. PFR removal was highly variable in both electrode experiments, and in some cases, individual PFRs increased after electrocoagulation treatment. Overall, CECs and CKCs of all three compound classes were detected in WWTP effluent, and the electrocoagulation treatment significantly reduced the number and amount of CEC/CKCs found in WWTP effluent water.