In most cases, yes, it’s perfectly safe, yet bottled water is the most common choice due to the poor taste of piped water. Indoor plumbed water in the Turks and Caicos almost always originates from one of two sources: reverse osmosis desalination, and less commonly, rainfall collection.
On Providenciales, most resorts, hotels and rental villas are connected to “city water”. This is a modern piped utility water service, with water produced by reverse osmosis. This water is safe to drink, but the taste is usually comparatively poor.
Some accommodations, largely older houses and outlying vacation rentals on Providenciales, use cisterns which are filled by rainwater collection from roofs or by truck from a desalination plant. In theory, a cistern could be contaminated by chemicals, pollutants or pathogens, however such an occurrence is almost unheard-of.
On our other islands, cistern use for smaller lodgings is almost universal, and hotels and resorts typically have their own reverse osmosis systems. Portable water filters can be a great way to improve the palatability of the country’s reverse osmosis water.