French water treatment company Veolia, the main water supplier in Lanzhou, told state-run Xinhua news agency that the polluted water might be caused by local petrochemical companies.
Kampuni ya Kifaransa ya utibuji wa maji, ijulikanayo kama Veolia, na wasambazaji wakuu wa maji jijini Lanzhou, ililiambia shirika la habari la serikali la Xinhua kuwa, benzini iliyopo kwenye maji imetoka kwenye viwanda vya uchimbaji na usafishaji wa mafuta ya asili.