Before Congress passed the Clean Water Act in 1972, U.S. factories and cities could pipe their pollution directly into waterways. Rivers, including the Potomac in Washington, smelled of raw sewage and contained toxic chemicals. Ohio’s Cuyahoga River was so contaminated, its oil slicks erupted in flames.

That unchecked pollution didn’t just harm the rivers and their ecosystems; it harmed the humans who relied on their water.

The Clean Water Act established a federal framework “to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.”

As an attorney and law professor, I’ve spent my career upholding these protections and teaching students about their legal and historical significance. That’s why I’m deeply concerned about the federal government’s new efforts to roll back those safeguards and the impact they’ll have on human lives.

Amid all the changes out of Washington, it can be easy to lose sight of not only which environmental policies and regulations are being rolled back, but also of who is affected. The reality is that communities already facing pollution and failing infrastructure can become even more vulnerable when federal protections are stripped away. Those laws are ultimately meant to protect the quality of the tap water people drink and the rivers they fish in, and in the long-term health of their neighborhoods.

A few of the most pressing concerns in my view include the government’s moves to narrow federal water protections, pause water........

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