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The degradation of ground water quality due to human activities is a widespread environmental problem. Furthermore, coastal aquifers are threatened by sea water intrusion as a result of increasing water exploitation. The investigation area near Dörtyol is located at the Mediterranean coast, southern Turkey, and dominated by agricultural land use. Drinking, domestic and agricultural purposes require different amounts of uncontaminated water. In this study the hydrogeological characteristics of the coastal plain were investigated. Discharge and ground water level measurements as well as geological investigations were undertaken in field in addition to anion and cation analyses of ground and surface water. The results show geological and anthropogenic influence on ground and surface water composition. In spite of a large number of wells in the coastal area sea water intrusion was not detected. With the goal of devising sustainable water use regulations, more emphasis and research needs to be directed to the long-term observation of ground and surface water quality as well as the detailed investigation of hydraulic characteristics of the local aquifer.

The Kütahya plain is one of the plains in Kütahya/Turkey, where drinking, agricultural and industrial water supplies are highly dependent on groundwater resources. The local population largely depends on water from alluvial shallow aquifer waters and some on the Felent and Porsuk rivers. Appraisal of surface and groundwater quality is extremely important to make sure the sustainable use of it for drinking, agricultural, and industrial purposes. The chemical quality of surface and groundwater of Kütahya plain has been studied in detail in order to have better understanding of potential water quality. A total of 21 groundwater samples and 6 surface water samples were collected in and around the plain. The relative abundance of major ions (meq/l) for most of the water samples were Ca 2+ ˃Mg 2+ ˃(Na + +K + ) for cations and HCO 3 -˃SO 4 2-˃Cl -for anions. Five hydrochemical facies have been identified based on the major ion chemistry of the surface and groundwater of this area. However, based on hydrochemical facies, the type of water that predominates in the study area is CaMg/Mg-Ca-HCO 3 type during both December 2013 and June 2014. There is no significant change in the hydrochemical facies noticed during the two sampling periods. The chemical Index such as Sodium Absorption Ratio (SAR), Residual Sodium Carbonate (RSC), Sodium Percentage (%Na), Permeability Index (PI), Kelley Index (KI), Magnesium Ratio (MR), Potential Salinity (PS) and Total Hardness (TH) were calculated. The results indicated that SAR, RSC and KI values revealed 100%, %Na value revealed 92.6%, PI and PS values revealed 85.2% and MR value revealed 66.7% of water samples are within the safe limit suitable for irrigation. To sum up, the quality of surface and groundwater of Kütahya plain in general was suitable for irrigation.

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