ABSTRACT The article states that the receipt of insufficiently treated wastewater into water bodies is largely caused by the use of outdated water treatment technologies, the deterioration of technological equipment, the late adjustment of the technological regime, and effective methods of removing phosphates from water in decentralized water supply. In this regard, it is necessary to implement comprehensive measures to prevent and reduce the deterioration of water quality, to develop effective methods of removing phosphorus-containing substances from wastewater, to conduct constant monitoring (through automated observation posts) of surface water quality with timely management decisions. The adsorption properties of granular composite materials based on glauconite have been investigated. Composite granular glauconite materials with sunflower husk adsorbent have been found to be most effective. The efficiency of wastewater treatment was 78%.