This report presents WorleyParsons’ (an independent consultant engaged by IPART) findings on its review of the economic lives of the Sydney Catchment Authority’s (SCA) assets. Assumed average asset lives for new and existing assets are used by IPART to calculate depreciation, and hence prices (as depreciation is a key component of an agency’s building block revenue requirement). For the purposes of calculating depreciation, SCA has proposed an asset life of 60 years for both its new and existing assets. This report reviews the SCA’s proposal.