PURPOSE: Professional voice users utilize systematic hydration to preserve the quality of their voice. However, the existing literature provides limited research on the systemic hydration of voice quality from a thermal and multi-dimensional perspective, particularly in speech-language pathologists (SLPs). Thus, using thermal and multidimensional measures, the current study inspected the effectiveness of systemic hydration in SLPs' voice quality. METHOD: The study involved 20 vocally healthy female SLPs allocated to vocal loading (control group), who read passage loudly for 1 hour, and systemic hydration (experimental group), who consumed water during the vocal loading task. Pre evaluation and post evaluation of multidimensional voice measures: thermal (front view of throat), acoustic (fundamental frequency, perturbation [frequency and amplitude], and noise-related measures), aerodynamic (maximum phonation time: MPT and s/z ratio), and self-perceptual [perceived phonatory effort (PPE), perceived vocal tiredness (PVT)] measures were collected for two groups. RESULTS: Pre-post comparison in the vocal loading group had a significant increase in thermal (FVT), acoustic [STD of F0, vF0, jitter, shimmer, amplitude perturbation quotient (APQ), and noise-to-harmonic ratio (NHR)], self-perceptual (PPE and PVT), and decreased aerodynamic measures MPT. However, no significant differences were noted in the systemic hydration group's thermal and multidimensional voice outcome measures. Between-group post test comparisons, the systemic hydration group showed a significant decrease in thermal front view of the throat (FVT), acoustic [jitter, NHR], and an increase in aerodynamic (MPT) compared with the vocal loading group. CONCLUSION: The voice quality was decreased in the vocal loading group, while the systemic hydration group remained stable, as depicted on multidimensional voice measures. This study confirms the positive benefits of systemic hydration on voice quality and recommends its incorporation into clinical practice for SLPs.