The study area is part of the Júcar River Basin, located in the southeast of the Iberian Peninsula. The MCC surface water course, whose flow is SO-NE, has a total length of 69.6 km. The research group has studied the incicence of some pesticides in the surface water body. The study highlights the possible indicence of the use of pesticides in crops, in the quality of discharges from the city’s WWTP.