Has the law improved the environment or situation for the clean water act? provide specific data from credible references

No, lots of improvements need to be made

Explanation:

A federal law of the US that govern water pollution and aims to provide clean and chemically free water to the nation under the 1972 section, as per the US Environmental Protection Agency.  Safe drinking water act and resource conservation act have also been implemented along with various policies like water quality. The main objectives raised were to make all U.S. rivers fit for fishing and swimming by 1983, and to have a 0 water pollution by 1985, to stop the discharge of toxic amounts of toxic pollutants in the river ecosystem.  To date, the U.S. stream and rivers of 70% of lakes, ponds, and reservoirs, and 90% ocean and coastal areas continue to violate quality standards.

B  maybe the answer hoped it