The subject of stream pollution has always received considerable attention in the state of Texas. The report on the Trinity River Sub-Basin has been prepared as an aid in the continued development of the water pollution control program for protection of the waters of the basin. It is a summary of information and data that were available January 1952 on the uses to which the water resources were put, the pollution reaching the watercourses and the damages resulting from that pollution, the benefits which may result from pollution prevention measures in effect and those pollution prevention measures which were required.