Licensed operators

• “S” licenses are designated for sanitary wastewater treatment systems. 
• “N” type licenses are designated for industrial or process wastewater systems. 
• “T” licenses are designated for potable water treatment systems. 
• “W” licenses are designated for potable water distribution systems. 
• “C” type licenses are designated for sanitary wastewater collection systems. 
• "NS" type licenses are designated for industrial wastewater treatment systems consisting only of an oil water separator or a sedimentation unit. 
• "CN" type licenses are site specific licenses designated for public wastewater collection systems which a person was operating as of July 2, 1984. 
• "NN" type licenses are site specific licenses designated for industrial wastewater treatment systems which a person was operating with a valid S-In license on July 2, 1984. 
• “VSWS” licenses are designated for public community water systems and public nontransient noncommunity water systems without treatment or public nontransient noncommunity water systems with limited treatment as defined in the regulations