Objective To monitor the concentration of trichloromethane in living drinking water in Inner Mongolia Autonomous Region in 2021,and to assess its health risk level.Methods We monitored the concentration of trichloromethane in living dhinking water in Inner Mongolia Autonomous Region in 2021.A risk assessment model was used to appraise the risk of trichloromethane concentration through three exposure pathways,namely,oral intake,percutaneous penetration and respiratory intake.Results The concentration ranges of trichloromethane in living drinking water in Inner Mongolia Autonomous Region in 2021 were ND-0.0592 mg/L,with a qualified rate of 100.00％and a detection rate being 13.24％.The carcinogenic risks of urban water through oral intake,percutaneous penetration and respiratory intake were 7.88×10-7,6.61×10-8 and 8.59× 10-8 respectively,with the cumulative carcinogenic risk level being 8.03×10-7.The carcinogenic risks of rural water through the above-mentioned three exposure pathways were 4.36×10-7,1.85×10-8 and 1.08×10-8 respectively,with the cumulative carcinogenic risk level of 4.39×10-7.The carcinogenic risk levels of urban and rural water were both less than 10-6,remaining within the acceptable range.The concentration of trichloromethane was higher in rural water than in urban water as well as higher in wet season than in dry season.As for different types of water samples,the concentration of trichloromethane in secondary supply water was the highest,followed by tip water and out-factory water,with statistically significant differences(P＜0.05).Conclusion The health risk level of trichloromethane in living dhinking water in Inner Mongolia Autonomous Region in 2021 was within an acceptable range.The concentration of trichloromethane in some regions is close to the limit recommended by Hygienic Standards for Drinking Water,and this issue should be noted by the local relative department.The concentration of trichloromethane can significantly increase in water supply networks,and monitoring and management of local water supply networks should be strengthened.
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