The passage of the Clean Water Act

Since the passage of the Clean Water Act, what has been the trend in water quality?

Group of answer choices

Nearly all U.S. waters have become clean enough for safe swimming

 

The number of waterways impaired by municipal wastewater treatment plants has more than doubled

 

Most of the dirtiest waters have become cleaner, but many still don’t meet ambient water quality standards

 

Most progress has been made on cleaning up non-point sources of