Mercury pollution was reported in Kodaikanal affecting lakes in the area. The causes, originating from a Hindustan Unilever thermometer factory nearby, were reported to be dispersal of elemental mercury into the atmosphere from improper storage and dispersal into the water from surface effluents from the factory. Apart from tests conducted on Kodaikanal lake, moss samples collected from trees surrounding the Berijam Lake, located from the factory, were also tested. These showed mercury levels in the range of 0.2 µg/kg, while in Kodaikanal lake the lichen and moss levels were 7.9 µg/kg and 8.3 µg/kg, respectively. Fish samples were taken from Kodaikanal lake also showed Hg levels in the range of 120 to 290 mg/kg, confirming that pollution of the lake had taken place due to mercury emissions from the factory.