A continuous upward flow sedimentation unit was developed to test surface waters at remote U. S. Air Force radar stations in Alaska for the presence of eggs of Echinococcus. Chlorination employed at these water supplies is not an effective protection. Many animals in these areas are infected with the tapeworm, and man can serve as a host for the larval form. Diagnoses of echinococcosis in the Native population caused concern by the Air Force for health of Air Force personnel. Lack of early disease symptoms and unreliability of clinical tests necessitate physical surveillance of water supplies. Laboratory.tests validated methodology. One field test showed negative results. Further tests are recommended.