An electronic rodent trap is provided that includes a microprocessor and a resistive sensor coupled to a high voltage killing circuit and to a wash down sensor. Upon detecting a resistance, the resistive sensor sends a detection signal to the microprocessor. The microprocessor activates the wash down sensor to determine whether the resistance is above a threshold value and/or shows variation characteristics consistent with the presence of a rodent and thus warranting activation of the killing circuit. Resistance that is below the threshold indicates the presence of water such that the killing circuit is not activated and false triggering of the electronic rodent trap is prevented. Animal traps and monitoring stations incorporating a wash down sensor for pest detection but without killing mechanisms are also provided.