Abstract: The present invention discloses an induced aeration device which utilizes a housing containing a plurality of slats having an air inlet on its bottom and an air outlet on its top. The housing contains a horizontally rotatable water distribution arm having horizontal water outlets directed in a reverse direction to that of rotation so that the distribution arm turns in response to the force created by the water outlet jets. A fan is disposed on top of the water distribution arm so that the fan turns with the water distribution arm. Further, the fan is effectively sized to induce the flow of air through the housing in sufficient quantity to aerate the influent water flow.