An investigation of the use of Soil Systems for recycling treated municipal waste effluents was conducted. The scope of the project included: the preparation of a user manual entitled Applying Treated Municipal Wastewater to the Land: Current Technology and an annotated bibliography of selected references in subject area. A state of the art investigation was made of the design, operation and control of irrigation and infiltration-percolation types of soil systems. The summarized results from this investigation were used by workshop participants selected from state, municipal, and federal agencies who were involved in soil system activities as a starting point in writing the manual. The bibliography contains selections which portrayed or influenced the present state of art in the subject field.