At least two rivers in eastern Meghalaya have turned blue again apparently due to "high acid content", resulting in death of scores of fishes.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/two-rivers-turn-blue-meghalaya-high-acid-content-doubted
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/meghalaya
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/jaintia-hills
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-cntrol-board-spcb
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/power-industry
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution