In the Interstate Sanitation District there is a wide variety of sewage treatment plants. Most of them are for partial treatment of the sewage only. A study of these plants has been made for the purpose of supplying to the Interstate Sanitation Commission actual cost data for plants constructed in the district.

The only way in which this information can be obtained is from municipal records where sewage treatment plants have been constructed and sewage is being treated at the present time. Unfortunately, there is no standard method by which sewage treatment plant costs are segregated in the various municipal accounts.

In the Interstate Sanitation District there are approximately sixty sewage treatment plants. It was the endeavor of the project workers to obtain data for all of these, but in some cases the information was of such doubtful value or so incomplete that it has not been included in the final tabulations. One or two of the plants from which reports were obtained are not situated in the Interstate Sanitation District, but are located in the immediately adjoining areas.

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