Are you looking for a rewarding career and an employer that promotes education, growth, and opportunities? The MES Water/Wastewater Operator in Training (OIT) program trains certified operators at facilities across Maryland. MES is always searching for self-motivated, driven individuals for the OIT program, which is a three-year apprenticeship providing paid, on-the-job training and mentorship. Upon successful completion of the program, operators receive a license as a water/wastewater operator for the State of Maryland.