Over the last several decades, the proportion of the U.S. population that is served by secondary or tertiary water treatment facilities has _________________.

Question

Quizplus · Accepted Answer

According to data from the Environmental Protection Agency, the proportion of the U.S. population served by secondary or higher-level treatment facilities increased from 73% in 1992 to 91% in 2012, indicating an increase in coverage.

Over the Last Several Decades, the Proportion of the U