Evaporative cooling system including a cooling tower attached to a modified swamp cooler. The modified swamp cooler comprising a fan, a fan housing and at least one air outlet located in a bottom of the modified swamp cooler. The cooling tower comprises at least one indirect heat exchanger and all inner surfaces of the cooling tower, except for the at least one indirect heat exchanger, are made from and/or comprise a non-porous material. The non-porous material is high-density polyethylene. The cooling tower attached to the modified swamp cooler is part of an evaporative cooling system and supplies cool air to a building or areas which desire cooling.