The aim of the project is to increase the availability of drinking water, improve the quality of the water supply system and reduce water losses along with improving the efficiency of its use in the Zaleszany Commune for 10 950 inhabitants of this commune. The project includes the implementation of the following investment activities. Task 1 - Modernization of the Water Treatment Station in Kotowa Wola. Task 2 - Construction of a small photovoltaic installation with a capacity of 111.10 kWp. Task 3 - Construction of a water supply network with a length of 2,688 m on the Magnolia housing estate in Obojna. Task 4 - Construction of a deep well S3B in Kotowa Wola Task 5 - Reconstruction of the existing water supply network in Turbia and replacement of nodes on the water supply network in Zbydniów and Turbia In the technological part of the SUW in Kotowa Wola, the project assumes replacing often emergency and imprecise water meters with flow meters. Mechanical elements of water meters, especially those installed in deep wells, are wrapped by iron and manganese, which reach high values in raw water. Flow meters are characterized by greater measurement accuracy and virtually failure-free. Currently operating nodes in the two largest towns of the municipality of Zaleszany, i.e. Turbia and Zbydniów, due to their age (25 years), and thus the failure of the gates, have lost their function of cutting off individual water supply sectors. In addition, the central location of these towns forces the passage of a significant number of transit pipelines. In the event of a failure or planned service work, it is necessary to turn off and then restore the flow over a large area of the water supply, which generates a significant loss of treated water. As part of the implementation of the project, 63 network nodes will be replaced. The generator of water losses is also a 90 mm pipeline in the town of Turbia, It should be estimated that the implementation of the project in the field of replacement of water supply nodes, replacement of an emergency section of the network and change of the technology for measuring the water circulation of SUW, will allow to reduce water losses in the network to the level of about 10% (50 000 m3). Due to the age of the infrastructure, microbiological contamination is the biggest threat to the adequate provision of drinking water in the Municipality of Zaleszany. The solution to this situation will be the construction of the S3a well. In addition, in terms of primary pollution, the project provides for the installation of a UV lamp on the output of treated water. This action will eliminate the chlorination of SUW, which is currently being carried out and guarantee permanent protection against primary pollution. Another problem of water supply in the Municipality of Zaleszany is microbiological secondary pollution, which is generated by corroded fittings in the central part of the water supply. When the water supply was relatively new, there was no need to disinfect it, water tests showed no exceedances. The implementation of this project for the replacement of 63 nodes in the central part of the water supply will eliminate the source of secondary pollution, which will increase the safety of drinking water use and reduce the use of chlorine, whose properties tests do not clearly guarantee indifference to human health. The project assumes the following energy-saving solutions: • construction of a photovoltaic installation producing approx. 30% of the energy requirement for SUW operation, • installation of an energy-saving hydrophore pump, the so-called SUW. ‘night’, • use of soft start-up of submersible pumps (most energy-intensive). The implementation of the project will reduce the average net energy consumption for consumption and treatment by 39.82%, i.e. to 0.60 kWh per m3 of water supplied (from 1.00 kWh/m3).