In the article, the role of aquatic plants in the biological treatment of wastewater from the Dangara bread production industry in the Dangara district of the Fergana region is studied. The physical and chemical composition of wastewater from the production plant, the growth, development, productivity and level of water purification of pistachio aquatic plants at different concentrations of the plant waste water were studied. The effectiveness of cleaning high-water plants (pistachio) in semi-production conditions was determined. By growing Pistia aquatic plant in wastewater from the enterprise, organic substances and impurities in the water are absorbed by the aquatic plant and lead to improvement of water quality. The physical properties and chemical composition of the water are greatly improved when a higher aquatic plant is grown in the wastewater. The amount of dissolved oxygen decreased from 3.67 to 9.14 mg O2/l, KBBT5 decreased three times (from 15.88 to 4.58 mg O2/l) and KBKT from 29.41 to 9.58 mg O2/l. Other indicators of wastewater have also improved