Abstract:Taking groundwater in northern area of Suzhou high-tech district as research object, sampling 17 groundwater monitoring points in the area to detect pH value and concentration of arsenic, cadmium, copper, mercury, lead, nickel, and hexavalent chromium in groundwater samples. Single element index method and pollution index are used to evaluate test results, and hazard assessment model is used to evaluate health danger. The results show that average content of seven kinds of heavy metals in groundwater in study area does not exceed the limit value of class Ⅲ standard. Some sampling points have heavy metal pollution, but the pollution degree is relatively light. 94.2% of groundwater samples in study area have lower total health risk than the maximum acceptable value, which has little adverse impact on health of local residents.