Customs assessment under tariff notifies specific infrastructure and utility projects for assessment and concessional import treatment. The Central Government notifies a range of infrastructure, energy, transport, urban development and utility projects for assessment under sub item (6) of heading No. 98.01 of the First Schedule to the Customs Tariff Act, 1975, listing specific project types (pipelines, LNG terminals, port and airport development, rail and metro projects, power transmission, water supply and treatment, mechanized handling and cold chain facilities) and distinguishing drinking water supply projects from broader water supply projects by reference to intended use; the notification includes subsequent insertions and substitutions expanding the list.