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Fleas will die in water if you purposely drown them in 10-20 seconds but if you just leave them in water, they will just float and will not die in days. Friday, September 28 2012. Source: http://www.alt4animals.com/flea.htm. 1  How Long does it take a bug to Drown. 2  Can fleas drown. 3  How long does it take a flea to drown.  How long does it take to drown a louse.
In order to develop, flea eggs need a warm, moist environment: a temperature of about 70 degrees Fahrenheit (21 degrees Celsius) and 70 to 85 percent humidity. In these conditions, the eggs hatch in about 12 days. This 12-day window is one of the reasons why it can be hard to get rid of fleas. Some insecticides kill adult fleas but not eggs, which means a whole new set of fleas can emerge after the adults have died.