reported cases state government state mysuru water quality indian express found positive 12 parameters potential made mandatory water tests 6000gram panchayats zilla panchayats panchayat staff summer onset test water special campaign gram panchayats drinking water tests test drinking water instruct gram panchayats drinking contaminated water checked post monsoon conduct field tests panchayat development officers harsh summer setting conducting special campaigns hydrogen sulphide test launch special drive people falling ill premonsoon groundwater level total dissolved solids chief executive officers