Ecological risk assessment can address requirements of natural resource damage assessment by quantifying the magnitude of possible damages to the ecosystem. This paper investigates an approach to assess water damages from pollution incident on the basis of concentrations of contaminants. The baseline of water pollution is determined with not-to-exceed concentration of contaminants required by water quality standards. The values of damage cost to water quality are estimated through sewage treatment cost. To get a reliable estimate of treatment cost, DEA is employed to classify samples of sewage plants based on their efficiency of sewage treatment. And exponential fitting is adopted to determine the relation between treatment cost and the decrease of COCs. The range of damage costs is determined through the fitting curves respectively based on efficient and inefficient samples.

生态风险评估可以通过量化可能对生态系统造成的破坏程度来满足自然资源破坏评估的要求。本文研究了一种基于污染物浓度评估污染事件造成的水损害的方法。水污染的基线由水质标准所要求的不超过污染物的浓度确定。水质损害成本的价值是通过污水处理成本估算的。为了获得可靠的处理成本估算，采用DEA根据污水处理厂的效率对污水处理厂的样本进行分类。并采用指数拟合法确定治疗成本与COCs减少之间的关系。