The Delaware Division of Public Health (DPH) offered the following guidelines during and after a flood:
If you are advised to boil your drinking water, heat water at the highest possible temperature so that it bubbles constantly (a rolling boil). Continue to boil water for one minute, and then let it cool. Store in clean, covered containers.
Residents can also disinfect water using household bleach. Add 1/8 teaspoon (or 8 drops) of regular, unscented, liquid household bleach for each gallon of water. Stir it well and let it stand for 30 minutes before using it. Bottled water is another safe alternative.
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via Delaware Public Health: Safe Flood Clean Up Guidelines | State of Delaware News.
