The ECO2 SuperOxygenation system is the technology of choice for supplementing D.O. in impaired waterways, meeting D.O. discharge requirements and increasing the D.O. level in the hypolimnion of lakes and reservoirs. The ECO2 SuperOxygenation system achieves high D.O. concentrations with greater than 90% oxygen absorption efficiency at a fraction of the power requirements of conventional aeration. With this system, it is possible to pull a small sidestream from a river or lake, SuperOxygenate it and then dilute it back into the main river or lake to satisfy D.O. deficiencies without treating the entire body of water. The ECO2 SuperOxygenation system can be installed in a small footprint, above or below water lines or even mounted on barges which can then be moved wherever and whenever needed. The flexibility and efficiency of the ECO2 system make it the technology of choice for meeting D.O. discharge requirements and aiding in the recovery of impaired rivers and lakes. The ECO2 SuperOxygenation system, a simple process with no chemicals and no moving parts other than standard industrial water pumps, results in a robust, reliable, flexible, economically competitive and environmentally-friendly green technology.