Traditionally, the Kumbh Mela is held after every 12 years. As per the estimate of the state, lakhs of sadhus and devotees took the ‘holy’ bath on September 13, 2015.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/assess-godavari-pollution-levels-plan-remedial-steps
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-pune
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/godavari
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-environmental-engineering-research-institute-neeri
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kumbh-mela
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-interest-litigation-pil
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution