The aim of this study was to assess the impact of treated wastewater (TWW) and borehole water (BW) on certain properties of sandy soil during irrigation periods of 7, 45 and 100 days. Twenty-four soil monoliths were placed at the experimental palm grove of the University of Ouargla Algeria and irrigated with TWW or BW, with average electrical conductivity (EC) values of 5.82 dS/m and 2.57 dS/m, respectively. The soil pH, EC and sodium adsorption ratio (SAR) were determined before and after irrigation. The pH of the soil watered with TWW was significantly greater than that of the one irrigated with BW. Moreover, the type of water used as well as the irrigation period length significantly impacted the soil EC and SAR, which decreased drastically after 100 days of irrigation. Our findings provide relevant information on irrigation in arid and semi-arid regions, suggesting that TWW can be used as an alternative to BW to irrigate sandy soils. Le but de cette & eacute;tude est d'& eacute;valuer l'impact de l'eau us & eacute;e trait & eacute;e (EUT) et de l'eau de forage (EF) sur certaines propri & eacute;t & eacute;s d'un sol sableux soumis & agrave; des p & eacute;riodes d'irrigation de 7, 45 et 100 jours. Vingt-quatre monolithes de sol ont & eacute;t & eacute; install & eacute;s dans la palmeraie exp & eacute;rimentale de l'Universit & eacute; de Ouargla Alg & eacute;rie et irrigu & eacute;s avec de l'EUT et de l'EF pr & eacute;sentant des valeurs de conductivit & eacute; & eacute;lectrique (CE) moyennes de 5.82 dS/m et de 2.57 dS/m, respectivement. Le pH, la CE et le taux d'adsorption de sodium (SAR) du sol ont & eacute;t & eacute; d & eacute;termin & eacute;s avant et apr & egrave;s irrigation. Le pH du sol irrigu & eacute; avec de l'EUT & eacute;tait significativement plus & eacute;lev & eacute; que celui irrigu & eacute; avec de l'EF. De plus, le type d'eau utilis & eacute;e ainsi que la dur & eacute;e de la p & eacute;riode d'irrigation ont significativement affect & eacute; la CE et le SAR du sol, qui ont diminu & eacute; drastiquement apr & egrave;s 100 jours d'irrigation. Nos r & eacute;sultats fournissent des informations pertinentes sur l'irrigation dans les r & eacute;gions arides et semi-arides, sugg & eacute;rant que l'eau us & eacute;e trait & eacute;e peut & ecirc;tre utilis & eacute;e comme alternative & agrave; l'eau de forage pour irriguer les sols sableux.