This study aims to verify the accuracy of water quality assessment using Quantum Analysis as a complementary approach to previous results obtained through the Entropy Operator concept in measured thermodynamics [1]. The research addresses the problem of the unclear impact of natural electromagnetic radiation on water properties and the variation in quality among different sources (rainwater, groundwater, and bottled water). To achieve this, an energetic analytical methodology was adopted, linking Boltzmann’s Energy and Planck’s Energy to estimate the atomic excitation frequencies (fag) of water samples under various irradiation conditions, accompanied by a graphical analysis of the relationship between frequency variation and irradiation time (t). The results revealed a significant decline in frequency trajectories for both groundwater (fag, AA-WS2) and bottled water (fag,AA-WS3) compared to the reference rainwater sample (fag,AA-WS1). This reduction is attributed to the influence of natural radioactive isotopes such as radium (^226Ra, ^228Ra) and uranium (^234U, ^238U). A slight effect was also observed from chemical additives migrating from plastic containers into the bottled water. Meanwhile, the similarity in frequency behavior between groundwater and bottled water indicates the absence of pre-treatment processes prior to bottling, such as Reverse Osmosis (RO) or Ion Exchange (IX). These findings highlight the significance of Quantum Analysis in detecting subtle energetic effects and confirm its effectiveness as a reliable tool for evaluating the quality of both natural and bottled water................ Keywords:...............Water Quality, Quantum Analysis, Atomic Frequencies, Radioactive Isotopes.