This work describes the results of the research of underground water from artesian wells, wells and rills from the villages Coșernița and Cojușna of the Republic of Moldova. In spring, 2022, 2 samples of water from artesian wells, 1sample from wells and 3 samples from rills were taken from Coșernița. At the same time, 1 sample of water from artesian wells, 4 samples of water from wells and 2 samples from rills were taken from Cojușna. All the sampled wells are important sources of drinking water for population. Water quality assessment for use as a drinking water was done according the criteria set by the national regulation Law 182/ 19/12/2019. All samples were analyzed for various chemical parameters, such as hydrogen sulfide and dissolved sulfides, ammonia and ammonium ions, nitrites, nitrates, total hardness, sodium ions, iron ions, fluorides, sulfates, chlorides, permanganate index, total dissolved solids. None of the water samples from Coșernița met water quality requirements by one or more parameters, and only two water samples from Cojușna met the requirements of the Law 182/ 19/12/2019 by the analyzed parameters. As an objective criterion of water quality assessment, we took the ratio of the concentration of each parameter in mg/L to its maximum allowable concentrations (Сi/mac) where Ci is the concentration of each parameter in mg/L, mac is the maximum allowable concentrations for the parameter in mg/L. Table 1 shows the values of the maximum allowable concentrations for those indicators, max detected concentrations, not meeting those values and the values of exceeding the mac for water samples from artesian wells. The concentration of nitrites, chlorides and permanganate index did not exceed the maximum allowable concentration in any of the analyzed samples. Table 1. Values of exceeding the maximum allowable concentration for water from the villages Coșernița and Cojușna. Parameter the maximum allowable concentrations, mg/L Сi/mac (mах) H2S 0,1 21 NH4+ 0.5 8 NO3- 50.0 4 total hardness max 7 mol/m3 4.4 Na+ 200 1.48 Fe (total) 0.2 4.35 F- 1.5 1.14 SO42- 250 3.6 TDS 1500 1.57 The present research detected a major problem with water quality in the Republic of Moldova and showed the need for modern technologies of water purification for solving this problem.