Groundwater quality assessment with two multi-criteria decision making methods

Groundwater quality is basic for groundwater pollution control and remediation. The study presented a quality assessment of phreatic water. Twenty samples were collected from the Yinchuan Plain and ten indices were selected for the comprehensive water quality assessment. TOPSIS method and osculating value method were applied. The study shows that the phreatic groundwater in the Yinchuan Plain has been polluted with F, TH, TDS, SO₄^2- and NO₂⁻. The water should be properly treated before used for drinking. The two methods are applicable in water quality assessment. The OVM is stricter than the TOPSIS method in water quality assessment.