This study analyzed the risk source affecting the quality of underground water source in “double source” distribution area to indicate the significant ecological value of groundwater and to provide basis and support for groundwater pollution control and more attention to protection. Based on the groundwater monitoring data and by using the method specified in the standard, groundwater quality and detection of unconventional indicators were evaluated, and multiples of the overproof indicators were calculated, ecological value of groundwater of regulating runoff and conserving water was evaluated. The results showed that groundwater quality in the study area is poor, mainly with a IV grade, and the metals As, Mn, and Fe are mainly exceeded indicators, among them, iron exceeded the standard by 36.9 times. The concentrations of fluoranthene, dichloromethane, naphthaline and anthracene all within the standards, indicating the water supply safety of groundwater were not threatened. The results showed that exceeded and detection indicators (except naphthalene) in the each of subarea aren't characteristic indicators of pollution sources, water resources in the study area aren't influenced by chemical industries pollution sources. Ecological value of groundwater of regulating runoff and conserving water is huge, and it should not be overlooked.