Is it safe to drink water that has been flooded?

Assessing Floodwater Quality

When evaluating the safety of floodwater, consider the source, duration, and speed of the flooding. Floodwaters from contaminated sources like sewage systems or agricultural runoff are more likely to be hazardous than those from clean sources like rain or snowmelt. Be aware that floodwaters can also be affected by nearby industrial or chemical plants, which can release pollutants into the water.

Treatment and Disinfection Techniques

If you’re forced to use floodwater for drinking, consider using the following treatment techniques to minimize the risk of waterborne illness:

• Boiling: Bring the water to a rolling boil for 1-3 minutes to kill most bacteria and viruses.
• Solar Disinfection (SODIS): Expose the water to direct sunlight for at least 6 hours in a clear plastic bottle or container.
• Filtration: Use a water filter with a porosity of 0.2 microns or smaller to remove bacteria, viruses, and other pollutants.

Using Floodwater for Hygiene Purposes

While it’s generally not recommended to drink floodwater, it may be safe to use it for hygiene purposes like washing hands or bathing. To minimize the risk of infection, use the following techniques:

• Use a water filter or boiling method to reduce the risk of bacterial and viral contamination.
• Avoid submerging open wounds in floodwater to prevent infection.
• Wash hands thoroughly with soap and water after coming into contact with floodwater.