Groundwater quality evaluation of Zhenjiang City, Jiangsu Province, China

The study area locates at Zhenjiang city, Jiangsu province, China. The total area is about 3843 km(2). Groundwater can be divided into three types, they are porous water, karst water, and fissure water. In order to know recent situation of groundwater quality, monitoring data of groundwater quality on August 15, 2000, December 6, 2000 and April 15, 2001 were used. The evaluation show that contents of Cl-, SO42-, total hardness, and TDS is good in most monitoring wells. But historical monitoring data show that contents of bacterial indexes and Fe2+, Mn2+, and NH4-N exceeded the national standard for drinking water. These indexes will be included into fuzzy comprehensive evaluation models in the future, when monitoring data of are available.