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Dear Sanjay,
The WHO/UNICEF Joint Monitoring Programme (JMP) for Water Supply and Sanitation has proposed the following indicators for the Sustainable Develoment Goal for water:
a total collection time of 30 minutes or less for a roundtrip including queuing to an improved water source
Read more at: https://www.wssinfo.org/fileadmin/user_upload/resources/post-2015-WASH-targets-factsheet-12pp.pdf