Reflecting the environmental cost of greenhouse gas emissions from an urban water system in the water price
2020
Chen, Ying‐Chu
This study evaluated greenhouse gas (GHG) emissions from an urban water system in Taiwan using a lifecycle assessment method. The water system of the Taipei region was used as a case study. Both on‐site and off‐site emissions of GHGs were considered. Total GHG emissions from the urban water system were 151,211.3 t CO₂‐eq/y in the study period. On‐site GHG emissions from water surfaces and chemical additives contributed 3.1% and 18.3% of total emissions. The reservoir accounted for 1% of total off‐site GHG emissions from electricity consumption; 60.3% was from purification plants and 38.7% from boosting stations. The environmental cost of GHG emissions from the urban water system was calculated as US$0.001 per ton of water, which implies that the water price in Taiwan should be increased to US$0.27/t. This study explored the principle of ‘user pays’ in water pricing by monetizing the environmental cost of GHG emissions.
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