The article presents the results of research work on biological treatment of domestic wastewater using aquatic plants formed at the "Bekabad city treatment facilities" in the city of Bekabad, Tashkent region. The results show that of the 4 aquatic plants tested, pistachio, eucorinia, azalea and duckweed, pistachio and eucalyptus were found to be water resistant. Experiments carried out in the laboratory showed that pistachios and eucalyptus were 100% in the water variant, 25%, 50% better than in the aquifer (even in the control variant), and had a high yield - 100%. Airborne pollutants - phosphates, chlorides, sulfates, nitrites and nitrates, was significantly reduced compared to other concentrations, and the demand for biochemical oxygen was satisfied by 90%, the color of the waste water became clear, the smell disappeared with use, and the pH became neutral. Pistachio is more water resistant than eucalyptus and has a higher absorption of pollutants. Therefore, we continued experimenting with pistachios to test wastewater treatment at the Bekabad water treatment plant. The results of testing the effectiveness of biological treatment of pistachio plants in the biological basin of the treatment facilities "Bekabad city wastewater treatment plants" show that pistachio plants contain less than 85% of the total amount of water, the chemical content of which is less than 80%. 90%, CBT was up to 92%, and the cleaning efficiency was 95%. The results of the above studies are the basis for the possibility of using pistachios in the process of cleaning domestic wastewater.