Solid-liquid interfaces produce strong electric fields that serve to facilitate a broad array of important chemical and physical processes. Our molecular-level understanding of these processes, and how they are affected by the interface, depends on the spatial distribution of these interfacial electric fields. These electric field profiles are typically derived from theoretical models or simulation studies of the mean charge density field. The field profiles predicted by this general approach do not represent the electric field profiles experienced by species in the system and therefore should not be applied to develop physical insight into interfacial chemical reaction rates or mechanisms.