The analyses and surveys which were undertaken to arrive at the current investment estimates are described. This analysis included an industrial cost model which was used to estimate required industrial investment and a detailed study of available data on industrial water use trends. The amount of planned construction for municipal waste water facilities obtained by a survey and a statistical model using municipal data is presented. The volume also contains the water pollution index for estimating the condition of the nation's waters and an evaluation of benefits and costs of various waste treatment levels from a national point of view.