Education
Lapin played water polo at Long Beach Wilson High School from 2001 to 2004. In 2004, he was named to the California-Hawaii All-America first team and was also named the CIF player of the year.
Lapin then went to University of California, Los Angeles, where he redshirted the 2005 season. In 2006, he started 15 games at goalkeeper and had a 4.87 goals against average.
The following year, he started 21 games, had a 6.90 goals against average, and was named to the ACWPC All-America third team
Lapin started 23 games in 2008.
He had 206 saves and a 6.35 goals against average. In 2009, he started 24 games, made 205 saves, and had a 4.82 goals against average.
His performance helped University of California, Los Angeles win the MPSF Tournament and reach the finals of the National Collegiate Athletic Association Championship that year. Lapin was named to the ACWPC All-America second team
He finished his college career with 719 total saves, which set a school record.