This study was conducted on vegetable farms on the banks of a fiery month, specifically on farms near the drainage canal of the brewery, sailors brush in the first circle, as well as the drainage channel of the brush heater. This was during the winter season of 2020, and include the evaluation of some heavy metals for Lactuca sativa irrigated with sewage-contaminated water, and these properties are (Cd, Ni, As, Cr, and plant protein). The seedlings were planted on December, 2020. Follow the sprinkle irrigation system for lettuce seedlings daily. An area of 24 m2 (4×6m) was used to plant seedlings. The growth period lasted 56 days. Lettuce samples from the farm were transferred to the water, plant and soil laboratory of the Chadian Institute for Agricultural Research for Development on February 06, 2021 in sterile plastic bags, washed well with tap water and then weighed and dried on the lab's outdoor tables (without exposure to sunlight) until complete drought. The drying took 15 days. Then it was crushed well and sifted with a scale sieve. The test was with a mesh 0.2 sieve per hole.The results of this study showed that the four heavy metal ratios in lettuce samples irrigated with contaminated river water exceed those of lettuce samples irrigated with artesian well water, and therefore the permissible limits of World Health Organization and The Supreme Council for Hygiene of France . Averages of Lactuca sativa samples irrigated with artesian well water were 24.40, 0.44, 24,066, 0.606 mg/kg, respectively