●Sewerage managing engineer

●Chief engineering technician of water supply equipment

●Engineering manager of domestic waste final disposal site

●Water tank sanitation supervisor

●Waste disposal facilities engineering manager

●Specified chemical substances operation chief

●Engineering manager of excreta and excess sludge resource recycling facilities

●Building construction managing engineer

●Rural sewage maintenance management engineer

●Construction managing engineer

●Wastewater treatment tank engineering manager

●Disposal of specially controlled industrial waste

●Wastewater treatment tank operator

●Electric work specialist

●Wastewater treatment tank engineer