LOS ANGELES—Authorities recently seized nearly 4,000 counterfeit water filters being imported from China at the Los Angeles/Long Beach Seaport, officials announced May 24.

The items, if genuine, would have had a suggested manufacturer’s retail price of nearly $150,000, according to Jaime Ruiz of U.S. Customs and Border Protection.

“CBP officers discovered the filters while conducting an examination of a mixed ocean freight arriving from China,” Ruiz said in a statement.

The water filters, seized on April 10, had counterfeit “National Sanitation Foundation” logos printed on them, Ruiz said.

“Consumers buying water filters on e-commerce sites should be aware that is extremely difficult to spot those containing fraudulent copied certifications,” said Carlos C. Martel, the department’s director of field operations in Los Angeles.

“We are advising consumers to protect their families by ensuring they are purchasing these products from legitimate sources only,” Martel said.

National Sanitation Foundation International is an accredited, third-party certification body, which tests and evaluates products to public health and safety standards.