Boil water in South Africa – when and how
What to do during a South African water-quality alert, how boiling fits into household treatment and how to store treated water safely.
Follow the local water-quality instruction
When a municipality or health authority says household water should be boiled, use that instruction for drinking, preparing food, brushing teeth and other stated uses. Water that looks clear can still be unsafe. If the notice gives a different treatment method or duration, follow the notice rather than a generic internet rule.
A safer household routine
- Use the cleanest available water and a clean pot or kettle.
- Bring the water to a full boil when boiling is the instructed treatment.
- Allow it to cool covered in a clean container.
- Store treated water covered and avoid dipping dirty cups or hands into it.
Boiling does not remove every chemical contaminant. During a chemical spill or other special advisory, use the authority's instruction about whether to avoid the water entirely.
Protect children and anyone vulnerable
- Use treated water for infant feeds and food preparation when the notice requires it.
- Wash hands with safe water after toilet use and before handling food.
- Keep treated and untreated containers clearly separate.
- Watch for diarrhoea or vomiting and start rehydration advice early.
Dehydration can become serious
Common questions
- When should I boil tap water in South Africa?
- Boil it when the municipality or health authority issues a boil-water instruction or when your local supply is known to be unsafe. Follow the exact notice for the area.
- Can boiling make every water problem safe?
- No. Boiling can be part of treatment for some biological contamination, but it does not remove every chemical contaminant. Follow the local authority's specific advice.
Sources
- Norms and standards for health surveillance of premisesNational Department of Health, South Africa
- Drinking-water safety guidanceWorld Health Organization
Last reviewed 26 August 2026.