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 G02 Health Occupations D006281 +
  G02.229 Environmental Health D004782 +
   G02.229.656 Sanitary Engineering D012498 

 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.780 Public Health Practice D015980 +
    G03.850.780.200 Communicable Disease Control D003140 +
     G03.850.780.200.800 Sanitation D012499 +
      G03.850.780.200.800.800 Sanitary Engineering D012498 
        G03.850.780.200.800.800.350 Drainage, Sanitary D004323 
        G03.850.780.200.800.800.700 Refuse Disposal D012037 
        G03.850.780.200.800.800.890 Waste Disposal, Fluid D014865 
        G03.850.780.200.800.800.900 Waste Management D018505 +

 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 
      G03.850.860.510.090 Biodegradation D001673 
      G03.850.860.510.490 Toilet Facilities D014038 
      G03.850.860.510.910 Water Softening D014880 
      G03.850.860.510.915 Water Supply D014881 +
      G03.850.860.510.900 Waste Management D018505 +

 J01 Technology, Industry, and Agriculture D013676 +
  J01.293 Engineering D004738 +
   J01.293.821 Sanitary Engineering D012498