Choosing the right source water for your dental practice is critical for infection control, waterline safety, and equipment longevity. Not all water is created equal—distilled, reverse osmosis, purified, tap, and spring water each carry unique benefits and risks that impact treatment product performance and compliance with CDC and ADA guidelines. This guide from Agenics Labs breaks down the best (and worst) water options for dental unit waterlines, explains how CFU, TDS, pH, and alkalinity affect outcomes, and provides actionable recommendations to keep your patients safe and your equipment protected.