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The present invention is a water filtration device for removal of heavy metals and organic compounds from contaminated drinking water, waste water and soil treatment solutions. The device comprises at least one iron filter connected in series to a sand filter. Removal of contaminants from water is enhanced by the application of a source of vibratory energy and/or an auger system to the iron filter. The auger system may be used either in place of or in conjunction with the vibratory energy source. Oxidizers and coagulants may be mixed with the water after passage through the iron filter and before passage through the sand filter to increase efficiency of contaminant removal from water. Also provided are methods for removal of heavy metals and organic compounds from raw water using a water filtration device of the present invention. Another object of the present invention is a water filtration device for removal of heavy metals and organic compounds from contaminated water that employs on-line addition of iron solution with an in-line injection port and a sand filter or multi-media filter, thereby eliminating the use of an iron filter. This system can be used for treatment of water containing low levels of heavy metals. Iron solution is added upstream of the sand filter to form a co-precipitate with the contaminants. The co-precipitate is removed directly by the sand filter.