Eight Northern Ireland beaches have been included in the prestigious Good Beach Guide.
More than 500 of the 800 UK bathing beaches tested are recommended
But the number of recommended beaches is still low, according to the Marine Conservation Society.
Despite reduced beach pollution, the society said Northern Ireland was in dire need of investment in its water treatment infrastructure.
Across the UK, beaches passing tough cleanliness tests hit a record high, according to the society's guide.
More than 500 of the 800 UK bathing beaches tested are recommended in 2006 for excellent water quality, up on the previous record of 453.
MCS coastal pollution officer Thomas Bell said: "The results of this year's Good Beach Guide are fantastic news for UK beach-goers, who can choose from a record 507 recommended bathing sites.
"Britain's beaches have definitely bounced back from the relative low of summer 2004, which was one of the wettest on record."
The Good Beach Guide also provides information on lifeguard cover, facilities, activities, access, parking, transport and maps.