The Hindus believe in taking a holy dip in the River Krishna during pushkarams to cleanse their sins.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/polluted-krishna-poses-health-risk-pilgrims
[2] http://admin.indiaenvironmentportal.org.in/category/author/gvr-subba-rao
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-hyderabad
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/krishna
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution