“Converting much of the region’s sewage into a valuable byproduct was a major achievement of the Boston Harbor cleanup. Over the past three decades, the fertilizer has been sold or given away in massive amounts: tens of thousands of tons a year sent to farms and golf courses, parks and gardens across the region.

But recent tests of the fertilizer, which has been sold for nearly 30 years, have caused concern. They show levels of toxic chemicals known as PFAS, which have been linked to low infant birth weights, kidney cancer, and a range of other diseases.”

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