Drinking tap water in St. Maarten is generally considered safe, particularly on the Dutch side (Sint Maarten), where water is produced by modern desalination plants using reverse osmosis. This process treats seawater to meet high-quality standards equivalent to the World Health Organization (WHO) guidelines. On the French side (Saint-Martin), the water also undergoes strict treatment and meets European Union safety standards; however, the infrastructure is older, and occasional maintenance or post-hurricane repairs can lead to variable quality or a strong chlorine taste. While the water is chemically safe for drinking, brushing teeth, and cooking, many visitors and locals still prefer bottled water due to the high mineral content and the potential for older plumbing in specific buildings to affect the taste. If you have a sensitive stomach, sticking to bottled or filtered water is a common precaution. For the most sustainable approach, many modern resorts now offer filtered water stations where you can refill reusable bottles, which is highly recommended given the intense Caribbean heat and the need for constant hydration throughout the day.