Abstract: Health risk assessment model was applied in Baiguishan reservoir to assess personal health hazard risk of genetic toxic and body toxic substances based on its measured data of water quality to control water environmental ecology and ensure the safety of water source. The results showed that annual personal health hazard risk of all kinds of pollutants was 4.38 ×10^-5 a^-1 from 2006 to 2015 in the reservoir, but the total risk values between 2006 and 2008 all reached 6.08×10^-5 a^-1, larger than the maximum acceptable annual value of 5.0×10^-5 a^-1, which was recommended by the International Radiation Protection Committee, and higher than the risk value of 1.0×10^-5 a^-1,which was suggested by Sweden and Netherlands. For drinking water pathway, the risk value order from high to low was ranked as Cr,As,Cd that carcinogenic substances to human health hazards, and the risk value from high to low was classed as F^-,Pb,Cu,Se,NH₃-N,Zn,Hg,CN^-, phenol that non-carcinogenic substances to human health hazards; the risk of carcinogens matters more dangerous to the human body than non-carcinogens. So, it is necessary to strengthen soil and water conservation work, strictly prevent agricultural non-point source pollution, promote scientific breeding, to further improve the water quality of the reservoir and ensure the safety of drinking water.

Key words: genetic toxic, body toxic, chemical carcinogens, non-carcinogens, risk, Baiguishan reservoir