33 10 00 Water Utilities 33 11 00 Water Utility Distribution Piping 33 11 13 Public Water Utility Distribution Piping 33 11 13.13 Ductile Iron Public Water Utility Distribution Piping 33 11 13.16 Cast Iron Public Water Utility Distribution Piping 33 11 13.23 Plastic Public Water Utility Distribution Piping 33 11 13.33 Concrete Public Water Utility Distribution Piping 33 11 16 Site Water Utility Distribution Piping 33 11 19 Fire Suppression Utility Water Distribution Piping Utilities refer to the systems or components used at their primary sources (i.e. water treatment facilities, power stations, etc.) for the production, transmission, or distribution of communications, electricity, fuel, water, steam, sewer or similar commodities.