The study presents the quality of groundwater in the Aranca Basin during the 2008-2009,achieved through the hydro geological drillings I, II for the freatic layer pollution and through deepdrilling. The water samples were collected according to the monitoring program. The Aranca riverBasin is located in the north-western part of the Banat hydrographic area.This area is occupied by fieldsthat represent the maximum development of the western part of the Romanian territory also the South-eastern sector of Pannonian basin. From the point of view of the freatic aquifer, it presents itself as ahorizon in the lowlands low down to depths of about 30-40 m. In the North of the low plain on theMureş–Bega Veche, Mureş–Aranca, underground stream has the direction NE – SV, with a slighttendency for drainage Aranca – Bega Veche. The drainage basin includes two bodies of groundwateraquifer GWBA 01 LOVRIN-VINGA and GWMU 20, split with ABA Mures.In the groundwater aquiferquality characterization and establishment of critical areas, has been taken into account the comparing ofthe indicators values with the admitted limits of Law 311/2004 (amending and completing Law No.458/2002 on the quality of drinking water).Starting in 2009, with the transposition of the EuropeanDirective 2006\/118\/EC into national law by Decision No. 53\/2009 for the approval of the national planfor the protection of groundwater against pollution and deterioration, groundwater is assessed from thepoint of view of quality, being two ways of framing: good or poor chemical status. The main criterion inassessing quality is considering the number of drillings in which recorded overrun of the parameters. If itis more than 20% of the total of drillings, then the source of groundwater is considered in poor chemicalstatus. An essential criterion in the assessment of the chemical status of groundwater is the establishmentof the limit values. For their determination for each groundwater source in part we had in view the originof pollutants, that they may be naturally present in groundwater, the tendency of dispersion and degree oftoxicity. The values can be found in the order 137\/2009 on approval of the limit values for groundwatersources in Romania.

groundwater, river basin, water quality, drilling, monitoring program

Presentation: oral