Abstract
The Angads plain aquifer system, composed of a phreatic groundwater and a deep confined aquifer, currently shows that some sites are contaminated with nitrates. These sites are located downstream of the epuration plant of Oujda. The current contamination affects almost 70% of the water collected in the study area, south of the groundwater aquifer. This situation may worsen if a policy of irrigating a large area by the treated wastewater is adopted.