Health and Welfare Canada, the World Health Organization and the National Council on Radiation Protection and Measurements and other health organizations have recommended that information on acoustic output levels from diagnostic ultrasound devices be made available to the user to minimize unnecessary exposure to ultrasound. To help achieve this, a survey of output levels from all diagnostic ultrasound devices sold in Canada was conducted in the spring of 1985. Statistical results of this survey are presented here. The results showed a wide spread in output levels for devices with the same claimed purpose. Comparison of the output level data to biological effects data indicated that, for many devices, a small but significant risk, due to unnecessary ultrasound exposure, cannot be ruled out.