The laboratory also conducts special tests to find out about drinking the composition of water and wastewater in accordance with the wastewater management regulation, surface wastewater processing regulation and other applicable legislation. Basic drinking the water quality requirements indicate that it is of appropriate chemical composition, and the components do not exceed the maximum permissible limits. Because of the harmful exposure of the human body to nitrates and nitrites in water intended for human consumption is strictly limited to prevent respiratory and cardiac vascular system, oncological, etc. disease risks.