A "localized sewer leak" has prompted Ocean City to close the stretch of beach between Stenton Place and Delancey Place to swimming as a precaution.
"As a result of this leak, some material may possibly have entered the storm sewer system," the city said in a statement.
Water samples are being tested, but the city said it expects bathing will be allowed to resume Tuesday.
The more than 1,500-foot stretch of beach closed to swimming is at the northern end of the boardwalk.
All other beached are open to swimming, the city said.