However, since there are residential uses of permethrin, a dietary exposure assessment was conducted to calculate average dietary (food and drinking water) exposure estimates to support the permethrin aggregate risk assessment. Therefore, the acute dietary risk assessment is protective of chronic dietary risk. However, since there are residential uses of permethrin, a highly refined chronic dietary (food and drinking water) exposure assessment was conducted to calculate chronic dietary exposure estimates to support the permethrin aggregate risk assessment. The short-term aggregate risk assessment combines exposures to permethrin from the registered residential uses and the dietary (food and drinking water) risk assessment. An aggregate risk index (ARI) approach was used for the short-term aggregate risk assessment since the oral and inhalation endpoints have different levels of concern.