Sao Tome and Principe

Can you drink the tap water in Sao Tome and Principe?

Last reviewed September 2026

Sao Tome and Principe scores 35/100 on our water-safety index — not safe to drink. Not safe from the tap. Water should be boiled, filtered, or bottled before you drink it. So when people ask whether tap water is safe in Sao Tome and Principe, the honest answer is “not safe to drink.” Scores above 70 mean tap water is generally safe to drink. 40–69 means treat it with caution — filtering or bottled water is wise. Below 40 means it’s best avoided straight from the tap.

Ice, brushing your teeth & cooking: what’s safe in Sao Tome and Principe?

Drinkable?

No — don’t drink it unfiltered. Boil, filter, or buy bottled.

Brush teeth?

Risky — use bottled or boiled water to brush, especially for children.

Ice?

Avoid ice — it’s frequently made from untreated water.

Cooking?

Generally okay, since a rolling boil kills most pathogens; rinse raw produce with filtered water when you can.

Should you boil the tap water in Sao Tome and Principe?

If you have to use the tap water in Sao Tome and Principe, boil it first: a rolling boil for one minute makes it microbiologically safe to drink. Boiling does not remove chemicals, heavy metals, or lead, so filtered or bottled water is better where you can get it. More on what boiling does and doesn’t remove.

Do you need bottled water or a filter in Sao Tome and Principe?

Bottled water is the safest choice for drinking in Sao Tome and Principe, and it's widely sold — always check the seal is intact before you buy. A reusable bottle with a built-in purifier cuts both cost and plastic waste on longer stays.

A basic taste filter won't make the tap water in Sao Tome and Principe safe. If you filter, use a purifier certified to remove bacteria and viruses; otherwise rely on bottled or boiled water.

Waterborne illness risk in Sao Tome and Principe

Untreated water in Sao Tome and Principe can carry the organisms behind travelers' diarrhea and, in some areas, more serious infections such as typhoid and hepatitis A. The CDC advises drinking only bottled, boiled, or properly filtered water, and checking your routine and travel vaccinations before you go. See CDC food & water precautions.

Worried about a specific tap? How to tell if your tap water is contaminated.

Water treatment & pipe infrastructure in Sao Tome and Principe

Sao Tome and Principe relies on limited treatment, aging network, delivered through a aging network — frequent contamination points. That puts the practical contamination risk between source and tap at high. Even where water leaves the plant clean, aging mains and rooftop storage are where quality most often slips.

Common questions about tap water in Sao Tome and Principe

Data & sources

• WHO/UNICEF JMP — 36.7% safely managed (2024)
• World Bank · safely managed drinking water (SH.H2O.SMDW.ZS)
• CDC · food & water safety for travelers

Read the full methodology — how the 0–100 score is built and what it does (and doesn’t) mean.

More countries in Africa

See the full Africa ranking — all 54 countries, safest to least safe.