The hotels soften the water to prevent hardness scales from forming which can limiting water flow, damage pipes, promote corrosion, leave deposits that have to be cleaned.
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“Hotel water is often as safe as the public water supply where the hotel is located,” Bartell told Verywell in an email. “But some remote hotels have their own private water supplies, which are less regulated.” In some older hotels, tap water might be contaminated by lead pipes, Bartell added.
In large hotels, rooms are assigned risers, or pipes that provide them with hot water. Up to two gallons a minute travels through the riser. “By keeping the water continually moving through each riser, we never let the water cool and get cold,” he says. Baths or showers are only a few feet away from hot water.
In some older hotels, tap water might be contaminated by lead pipes, Bartell added. If there's a boil water advisory at your travel destination, you can ask the hotel for bottled water or boil the tap water before drinking.