The typical half-life of cypermethrin in the soil is 30 days, although it can range from two to eight weeks. Soil microbes rapidly break down cypermethrin. Cypermethrin has an extremely low potential to move in the soil. It is unlikely to contaminate groundwater because it binds tightly to soil particles. Cypermethrin is stable in sunlight. The average half-life of cypermethrin on foliage is 5 days.