5 Takeaways From Our Reporting on Toxic Sludge Fertilizer

For decades, the government has encouraged farmers across the United States to spread sewage sludge on their cropland and pastures. But now there’s a growing awareness that sludge fertilizer can contain heavy concentrations of “forever chemicals” linked to cancer, birth defects and other health risks.

This sludge is a byproduct of the nation’s wastewater-treatment plants. It’s the solid stuff that remains after city sewage is treated. But because it’s essentially concentrated waste, those toxic chemicals, known as PFAS, can become concentrated in it, too.

Here are the key findings from The New York Times’s examination of sludge fertilizer use and the consequences for farmers and the food supply:

Millions of acres are affected.

The fertilizer industry says more than two million dry tons of this kind of fertilizer were used on 4.6 million acres of farmland in 2018. It estimates that farmers have obtained permits to use sewage sludge on nearly 70 million acres, or about a fifth of all U.S. agricultural land.

The sludge is also applied to landscaping, golf courses and forest land. It’s so plentiful that it has even been used to fill up old mines.

Some farmers allege that it killed their animals.

Several ranchers in Texas claim that sewage sludge applied to a neighbor’s fields contaminated their land and contributed to the deaths of horses, cattle and catfish on their property. They are suing the company that provided the sludge. They are also suing the Environmental Protection Agency, saying it failed to regulate the PFAS chemicals in fertilizer.

The company that provided the sludge told The Times that it was “vigorously contesting” the allegations, and that it is simply a “passive receiver” of chemicals that are already in the sludge.