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There’s something in the water on Long Island.

Lifelong friends and brainiac All-American distance swimmers Johnny Macko and Sasha Karafin are making a huge splash in the Bellmore-Merrick school district as super seniors who will dive headfirst into Ivy League pools next year.

“We’ve always just been on the pool deck together,” Brown University-bound Macko, who was recently named Mepham High School’s salutatorian with a 101.82 GPA, told The Post.

Sasha Karafin, left, and Johnny Macko hold textbooks poolside at the Nassau County Aquatic Center in East Meadow, N.Y., on Oct. 28, 2026. Robert Sabo for NY Post

“We’re always cheering before our races — high-fives, ‘good jobs.’ It’s the little things that matter.”

Soon-to-be Yale Bulldog Karafin, who has a 100.9 GPA at neighboring John F.…