## 4 Conclusions  
Taking into account the requirements included in the regulation of the [PERSON] of Health of 11 December 2017 [9] and comparing them with the results of measurements of the tested water samples, it was found that the concentration values of the activity of radioactive elements did not exceed the permissible limits specified in the regulation. The obtained results were compared with those obtained in other regions of the world.  
Trace amounts of radium \({}^{226}\)Ra were detected in the investigated waters. The differences in the amount of radium \({}^{226}\)Ra in the waters are due to the soil structure and its composition [60; 61; 62]. The nature of the tested water is also an important aspect. Deep water and spring waters are rich in natural radioactive elements--this enrichment results from their leaching from the soil structure. On the other hand, groundwater has a much larger number of elements from an artificial origin, such as strontium \({}^{90}\)Sr or cesium \({}^{137}\)Cs. When analyzing the effective doses for the tested mineral waters from Poland, the highest value was determined in the Amita water sample. It should be emphasized that the determined effective dose, e.g., for an adult, does not pose a threat to human health and life; it constitutes about 0.8% of the limit and permissible value, which is 1 mSv/a, in accordance with the applicable \"Atomic Law\", and 8% of the limit value for drinking  
Figure 13: The concentration of zinc in mineral waters (\(\upmu\)g/L).  
water, which is 0.1 mSv/a. It follows that consumption of mineral waters available on the domestic market does not pose a threat to human health and life from the point of view of radiological protection.  
The investigated mineral waters were rich in trace elements. As a result of the analysis, it was found that the waters were most rich in zinc and copper, micronutrients necessary for proper human development. The most dangerous metals, cadmium and mercury, in all waters were below the limit values specified in the Ministry of Health Regulation of 2017 [9]. In the investigated mineral waters, chromium and nickel are not a problem. The greatest threat to people drinking the investigated mineral waters is lead, which in eight waters exceeded the permissible value. Among the analyzed waters, the best quality in terms of the concentration of all metals was demonstrated by the waters of Zywiecki-Krysztal, Primavera, Henryk, and Franciszek.  
Drinking water should be subject to constant control and protection against possible contamination. If the water does not meet the basic criteria that qualify it for household use, it cannot be consumed by humans. Heavy metals tend to accumulate in organisms. After a while, regularly taking small doses begins to manifest itself with various health problems, depending on the properties of the metal.  
For all author contributions, it is conceptualization 33%, methodology 33%, research 33%, formal analysis 33%, writing--review and editing 33%and article preparation, project administration, 33%,; funding acquisition, 33%. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
Not applicable.  
The authors declare no conflict of interest.