PurposesThe clarify the water environment characteristics and human health risks of the drinking water sources in Hongta District of Yuxi, and to provided references for ecological environment protection of drinking water sources in Yuxi District.
MethodsCombined with the water environment quality test data of Feijinghai Reservoir from 2014 to 2018, the health risk assessments of 9 indicators were evaluated by the US Environmental Protection Agency (US EPA) recommended health risk assessment model for water quality index.
ResultsThe water quality of Feijinghai Reservoir was in good condition from 2014 to 2018. All the monitoring indicators except NH3-N were in conformity with the surface water environment quality standard I (GB 3838—2002). The average annual health risk of individuals caused by drinking route of various pollutants varied between 4.1×10−5 and 1.3×10−4 a−1, both higher than or close to the recommended values of the international commission on radiological protection (ICRP) and US EPA, but the overall trend was decreasing trend year by year. The total chemical carcinogens risk (Cr6+, As, Cd) of drinking water was much higher than that of non-chemical carcinogens (F−, Cu, NH3-N, NO3−, Mn, Fe), and the main carcinogenic pollutant was Cr6+. The health hazard risk of each non-carcinogen was 10−9-10−13, and the risk value was negligible. Pearson correlation analysis showed that there was a very significant positive correlation between Cu and F−, Mn, Fe, Cd, Cr6+ (P<0.01). There was a very significant positive correlation between Cr6+ and Cu, F−, Fe, Mn, Cd, and the correlation between Cr6+ and Cd was extremely significant (P<0.01, R2=0.832), indicating that Cr and Cd content had a great influence.
ConclusionsThe total risk of human health hazards in Feijinghai Reservoir water was dominated by the risk of chemical carcinogens. The main chemical carcinogens were Cr6+, and the fluoride in non-carcinogens was the highest, which should be given priority attention and key control.
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