Water Quality Warnings worldwide

Drinking water, bathing water and boil-water notices — covered for 197 countries. Water quality warnings include boil-water notices, bathing bans and advisories for lakes, rivers and coasts after contamination or heavy rain.

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What counts as a water quality warnings

Water quality warnings include boil-water notices, bathing bans and advisories for lakes, rivers and coasts after contamination or heavy rain. They are issued by water utilities and environment agencies, and are usually limited to a specific supply zone or beach section.

If a warning is active

• Boil water for at least one minute, or use bottled water, during a boil-water notice.
• Respect bathing bans - they follow measurements, not appearance.
• Do not swim for 24-48 hours after heavy rain near storm overflows.

Sources used for this category

national water utilities, environment agencies, EEA bathing water data, WHO. Waarning reads these public feeds directly in your browser; the official warning always keeps the name of the authority that issued it.

Frequently asked questions

Other warning categories

• Flood Warnings
• Wildfire Warnings

Generated 2026-10-12.