Yamuna (mainstream): 37.50 per cent (546 million litre per day (MLD) treated at Wazirabad; 409.50 MLD at Chandrawal)
Western Yamuna Canal: 33.36 per cent (910 MLD, treated at Haiderpur)
Ranney wells (huge wells on the riverbank) and tubewells: 10.81 per cent (295 MLD)
Ganga: 18.33 per cent (500 MLD, treated at Shahadara)
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/how-much-and-where
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/yamuna
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pesticide-residues
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agra-d