Dozens of New Jersey water systems that serve a combined 500,000 residents exceeded new stringent standards last year for PFAS, a family of chemicals that have been linked to cancer and other ailments, environmental officials said Tuesday.

Higher levels were found in 34 community water systems, including several in Bergen County that now face millions of dollars in expenses to buy filtering equipment.

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The largest water provider that exceeded the standard was the Middlesex Water Company, which serves 233,000 people.