A system and related methods for monitoring and dosing peroxycarboxylic acids, particularly peracetic acid, in food processing applications based upon the desired concentration of the processing solution. The peroxycarboxylic acid concentration measured, and additional peroxycarboxylic acid added to the processing solution if the measured concentration is below a threshold level of the desired concentration, or additional water being added to the processing solution if the measured concentration is above a threshold level of the desired concentration. The system and related methods can be utilized with either live stream or static water sources to keep the concentration of peroxycarboxylic acid at or near desired concentration levels, which results in less concentration variation than experienced with conventional flow-based or hand-mixed systems.