The method comprises: mixing an adsorbent reagent (31) with water to produce a water-adsorbent reagent mixture and adsorbing the pollutants in the water; subjecting the water-adsorbent reagent mixture to a liquid-solid separation process and producing treated water (90) and sludge (100); contacting the water or treated water with living aquatic organism (220), where the value of property of the living aquatic organism is correlated to the concentration of the pollutants in the water or treated water; and evaluating the value of the property of the living aquatic organism. The method comprises: mixing an adsorbent reagent (31) with water to produce a water-adsorbent reagent mixture and adsorbing the pollutants in the water; subjecting the water-adsorbent reagent mixture to a liquid-solid separation process and producing treated water (90) and sludge (100); contacting the water or treated water with living aquatic organism (220), where the value of property of the living aquatic organism is correlated to the co