Purpose The purpose of this study to monitor the state of deep sewerage networks is a task of current interest in connection with the emergency and pre-emergency condition of a large part of sewerage systems in the cities of Ukraine. Design/methodology/approach To monitor the state, performance and reliability of deep sewer collectors, it is necessary to provide monitoring wells and, during the lifetime, to carry out planned inspection of groundwater levels in the wells and to timely identify areas of filtration of wastewater into the ground. Findings Monitoring the state of deep sewerage networks is a task of current interest in connection with the emergency and pre-emergency condition of a large part of sewerage systems in the cities of Ukraine. To monitor the state, performance and reliability of deep sewer collectors, it is necessary to provide monitoring wells, and during the lifetime, to carry out planned inspection of groundwater levels in the wells and to timely identify areas of filtration of wastewater into the ground. Originality/value Implementation of works on reconstruction and strengthening an emergency section will extend the service life of the sewer collector without reducing its capacity.