The paper deals with the issue of nitrates in groundwater, to where they predominantly pass due to the application of nitrogen fertilizers in agricultural areas. Excess concentrations of nitrates in drinking water are undesirable, and may even cause a life - -threatening condition called methemoglobinemia. The permissible concentrations of nitrates in drinking water are determined by legislation and the upper limit is 50 mg/l. Approximately 5% of the Czech population draw water from individual sources. In this study we identified and analysed selected samples from wells located in the Moravian-Silesian Region and in the Olomouc Region. The data and test results in this paper show that the nitrate concentration limit of 50 mg/l was exceeded in a half of the analysed groundwater samples. In some cases, the limit was exceeded in the order of tens of mg/l.

The purpose of this study is to evaluate the potential for infiltration in a study area – Rožnov pod Radhoštěm, the Czech Republic. The results are important for the future design of an artificial recharge structure as a method to store water underground in times of water surplus. A total of six measurements of infiltration were made using a double ring infiltrometer on selected prospective sites for the future application of artificial recharge. The results of infiltration tests were analysed based on the Philip’s model. The steady soil infiltration rates ranged from 28 cm∙h⁻¹to 70.38 cm∙h⁻¹and the cumulative soil infiltration ranged from 58 cm to 68 cm.

This study assesses the water quality of the Sušanecké Ponds in the Czech Republic post-mining area. Four monitoring profiles were chosen: the Sušanka River inflow into the Sušanecké Ponds, two ponds and the outflow of the Sušanecké Ponds to the Sušanka River. The sampling took place in a 14-day interval from March to October 2022. The monitored parameters were temperature, O₂, pH, electrical conductivity, turbidity, nitrate nitrogen, ammoniacal nitrogen, total phosphorus, chlorophyll-a, COD_Cr, BOD₅ and metals—Fe, Mn, Cu, Zn, Ni, Pb, Co, Cd, Cr. The results were evaluated in accordance with the Czech standard ČSN 75 7221 and Government Regulation No. 401/2015 Coll. Based on the evaluation data, it was found that the area of the Sušanecké Ponds does not meet the limits of the government regulation for three out of the twenty parameters. According to the standard, Sušanecké Ponds are mainly classified as highly polluted waters.

This study explores the effectiveness of ultraviolet (UV) irradiation, ozonation (O₃), granular activated carbon (GAC) adsorption, and their combinations (UV/GAC, O₃/GAC) in removing selected pharmaceuticals and common wastewater micropollutants under controlled laboratory-scale conditions. Eight target compounds—candesartan, irbesartan, valsartan, metoprolol, diclofenac, metformin, sucralose, and caffeine—were identified and quantified in real wastewater samples collected from a municipal wastewater treatment plant. Ozonation proved to be the most effective standalone method, achieving complete removal (100%) of five pharmaceuticals and partial removal of sucralose (~60%) and metformin (~17%). The combined O₃/GAC treatment further enhanced overall removal efficiency. In contrast, UV irradiation alone showed limited effectiveness. Importantly, all substances except metformin were fully removed by at least one of the tested methods. These findings underscore the potential of advanced and hybrid treatment technologies—validated here at the laboratory scale—for improving pharmaceutical removal from wastewater and mitigating their environmental impact.