Cost-intensive conventional sewage treatment plants have often stopped civic agencies from investing in treating effluents entering lakes.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/kundanahalli-lake-get-effluent-treatment-system-under-csr-funds
[2] http://admin.indiaenvironmentportal.org.in/category/author/g-manjusainath
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karnataka
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-t
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-plants-stp
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corporate-social-responsibility