The waste water/storm water treatment system includes a plurality of treatment modules, each of which includes upper and lower tank members. Each tank includes an inlet with a spray bar at the upper end thereof, and a drainage member at the lower end thereof. Treated water moves from the drainage member in the upper tank through an inlet at the top of the lower tank. The outlet member of the lower tank is connected to a pump which is controlled by a switch, to move water to the next module in the system or to the drainage system. The tanks have metal-adsorbing inorganic media or agricultural media positioned therein, such as activated rice hulls, corn cobs and the like for adsorbing metals in the storm water/waste water.