This Decree of the Regulatory Office for Network Industries, which is composed of 11 articles and four Annexes, lays down quality standards for drinking water supplied by public water system (art. 2) and receiving wastewater by public sewerage (art. 3). The quality standards for drinking water include compliance with the threshold values of indicators of drinking water quality, quantity of water per time period, pressure of water, continouis water supply, restoration of water supply after interruption, technical conditions of water supply.