Delaware's beaches rank first in water quality out of 30 states, according to the Natural Resources Defense Council.
The new report from the NRDC found just three-percent of water samples exceeded the national "Beach Action Value'' for 24 beach areas in 2013.
Dewey Beach is listed as a "superstar" beach for its water quality over several years.
New Jersey ranked third best beach water quality in the country and Pennsylvania ranked 22nd.
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Rankings were based on the level of bacteria in ocean and lake waters.