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2,834

13,521

13,683

1,264

Sources: U.S. Public Health Service Municipal Wastewater Inventories and USEPA Clean Water Needs Surveys.

Notes: Less than secondary facilities = Primary + advanced primary; Greater than secondary facilities = Advanced secondary + advanced treatment; No discharge = Facilities that do not discharge effluent to surface waters.

Sources: U.S. Public Health Service Municipal Wastewater Inventories and USEPA Clean Water Needs Surveys.

Notes: Less than secondary facilities = Primary + advanced primary; Greater than secondary facilities = Advanced secondary + advanced treatment; No discharge = Facilities that do not discharge effluent to surface waters.

Key observations from Table 2-5 and Figure 2-9 include the following:

• The population served by POTWs in the nation increased significantly, from about 91.8 million people in 1950 to about 140.1 million in 1968 (four years before the 1972 CWA). By 1996, 189.7 million people were connected to POTWs, a 35 percent increase from 1968.

• The number of people relying on POTWs with less than secondary treatment dropped rapidly after passage of the 1972 CWA. In 1968 (4 years before the

^ No Discharge I I > Secondary

^ No Discharge I I > Secondary

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