Can I Drink the Tap Water?

Water Quality Around the Globe

Tap water safety varies by municipality, source water, treatment, local advisories, and building plumbing. Switzerland, Singapore, and Finland generally have strong drinking-water standards, but conditions can still differ by location and temporary notice. In other places, untreated or contaminated water may pose a health risk.

Boil Notices and Travel Tips

In countries where tap water is not safe, stick to sealed bottled water, filtered bottles, or boiled water — even for brushing your teeth. Avoid ice cubes in drinks unless you know they were made with purified water. Street food is often fine when cooked, but raw vegetables washed in tap water can be a hidden source of contamination.

Why Water Quality Varies

Infrastructure, water sources, climate, and regulatory standards all play a role. Country-level labels are only a starting point: a city, hotel, rural area, or current boil-water notice can change the practical advice. Check local public-health guidance for the exact destination and date.

Staying Healthy While Traveling

Travelers can experience stomach illness for many reasons, and a change in water is only one possibility. If you are unsure, use sealed, treated, or boiled water and follow local advisories. People who are pregnant, immunocompromised, or managing a medical condition should ask a clinician for destination-specific advice.

Sources, Methodology & Update Note

This country-level guide is a quick educational reference, not a real-time water-quality test. It combines broad destination classifications with public-health travel guidance. For current conditions, check the CDC Yellow Book guidance on water disinfection, WHO drinking-water monitoring resources, and local utility or health-authority notices.

Last reviewed: September 2026. Conditions can change quickly, so verify local advisories before drinking tap water or using it for ice and brushing teeth.