Correction to: Nature Sustainability https://www.nature.com/articles/s41893-021-00713-7, published online 19 April 2021.

In Fig. 5b of this Article, the pie chart attributed 14.7% to wastewater treatment. After correcting an error in the original calculations, this estimate has been revised to 4.2%. In addition, in the main text ‘46.5%’ should have been ‘36%’ in the sentence starting “On the basis of data provided by the utility…”, and ‘53.5%’ should have been ‘64%’ in the sentence starting “The source of the remaining…”. The original Article has been corrected online.