The basic Wastewater application contains predefined label definitions for most of the feature classes. The standard attribute for the label text is called Name Number.
By default labels are not visible in the drawing. Only labels that are defined as auto labels are created during the create feature operation. Insert labels using Home tab 
Modify panel Create Label. 
Label tables use the suffix _TBL and contain feature labels.
Example Section label — The following label definition is used to write the diameter, length and material. The label text is queried from the tables WW_SECTION, WW_LINE, WW_SECTION_MODEL, and WW_MATERIAL_TBD.
SELECT nvl2(max(DIMENSION_1),'','')||max(DIMENSION_2)||' '||round(sum(line.LENGTH),1)||' '||max(material.VALUE) FROM WW_SECTION sec, WW_LINE line, WW_MATERIAL_TBD material WHERE sec.FID= $id AND sec.FID = line.FID_ATTR(+) AND sec.ID_MATERIAL = material.ID(+)
For more information about defining labels, see the Creating a Label Definition in the Infrastructure Administrator Guide.