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