Zhangyugou. The main pathwayof dischargeof groundwater is runoff and drainage of ditch, ounted for 82.24%of the total excretion.Then there are evaporation, artificial miningand drainageof Zhangyugou.(3)Groundwater pollution in the study area isveryserious. Themanganese, nitrite, total hardnessand TDS aremost seriously, exceeding rates were 45.2%, 35.5%, 35.5%, 32.3%. Then the sulfate, ammonia nitrogen, nitrate nitrogenandfluoride exceed the standard slightly, exceeding rates were 25.8%, 25.8%, 22.6%, 6.45%. It is worth noting that the concentration of ponents in Zhangyugouis higher than other regions.(4)The human health riskof drinking water was simulated by the EPA model of American.The assessment results show that 138 people would have been cancer from 1
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