Boiling drinking water kills many germs that can make people sick.

fact_checkWhat experts say

• infoHeating water to a rolling boil is enough to inactivate harmful bacteria, viruses and protozoa.1
• infoBoiling is the best way to kill germs in water.2
• infoTap water can sometimes get contaminated with germs that make people sick.2
• infoIf you are not sure the water is safe, boil it or use another method to remove germs.2

checklistWhat to do

• check_circleIf you are not sure water is safe to drink, boil it.2
• check_circleBring water to a rolling boil; this is enough to inactivate harmful germs.1
• check_circleIf you think tap water is contaminated, contact your water supply office or health department.2
• check_circleIf you get sick from water, report it to your health department.2

menu_bookSources

1. 1Boil waterwho.intopen_in_new
2. 2Germs That Can Contaminate Tap Watercdc.govopen_in_new

Updated 27 Oct 2026