The master’s final paper analyze the efficiency of Lithuanian water supply sector work sustaining set model of monopoly market, which was made using organic knowledge of Lithuanian and foreign authors. Before analyzing the main environment factors, that stop successful sector development all the year round, are identified and properly explored. With reference and theoretical intelligence, such alternatives of efficiency amendment, as reorganization and privatization, are weighted up by basing likely benefit and evaluating economic and social results using forecasts and mathematical – econometric methods. The first hypothesis, that the efficiency or economic work is different in varied groups of companys and the less company is, the less its work efficiency is, - so the want of sector reform by grossing it come was confirmed. The second hypothesis, that water supply sector reorganization and privatization must be universal valuable, is confirmed parcel, for sustaining pessimistic forecasts, when companies win, customers lose.

This master final paper formulates pricing of water sector services, analyzes sustainable price for water services, evaluates tax rates, paid for water, from every water user. The purpose of this paper is to find out reasons, which are damaging for JSC “Šiaulių vandenys” future efficiency and viability. It analyzes and systemizes theoretical and practical research from scientific, methodological and publicist literature, along with special research water methods. The hypothesis of this master paper was substantiated only partly, because an efficiently water pricing depends not only from water service company, but from political, legal and environmental frames as well, which come directly from the State government and EU directives.