He did just that, going out on top in two races at the 3A state swim meet in Provo on Feb. 9.
Carfi won both the 200-yard individual medley (combining the freestyle, breaststroke, backstroke and butterfly disciplines) and the 100-yard breaststroke events, putting a strong finishing touch on a decorated high school career.
"It was incredible," he said. "I've been swimming since I was about six years old. All that work paid off. It was really cool being able to do that."
Carfi, who also won the 100-yard breaststroke his sophomore year, said he enjoys the individual and team aspects of swimming.
"It's an individual sport, so you push yourself and you go to practice to better yourself," he said. "But you also have the team aspect, which is great."
The PCHS boys' team finished in second place at the state tournament with Carfi leading the way. Rival Wasatch, which sports a much larger team than Park City, took first.
"Our team is like my extended family," he said. "Being with them and having that experience was surreal. It was cool that nine of us could get second (against a much bigger team)."
With his high school career over, Carfi is looking forward to a service trip to Vietnam this summer and college in the fall.
After a trip to Peru last summer, Carfi will head to Southeast Asia to help build a school for the locals, among other things.
Also the president of the PCHS chapter of the National Honor Society, Carfi said helping people is something he truly enjoys.
"I like to travel," he said. "Anything that allows me to travel and also help out interests me."
After the summer trip to Vietnam, Carfi will continue his swimming career at Wesleyan University in Middletown, Conn., this fall.
He said he looks forward to contributing to the Cardinals' swim team his freshman year, helping them compete for a New England Small College Athletic Conference championship.
"It's a good program. They're a very competitive swim team," he said. "I just want to get acclimated to the new team and help them out in whatever way I can."
Carfi said he didn't think he'd end up at Wesleyan, but is happy with his choice.
"I grew up in Connecticut and I never thought I'd want to go back there for school," he said. "But I went back there to look and I loved it."
He'll pursue a political science degree, with the hopes of moving to Washington, D.C., after graduation for a career in politics.
Get to know Zach
Favorite class: Government
Favorite food: Italian
Favorite movie: "The King's Speech"
Favorite sports moment: When I started swimming (at age 6)
Dream job: Something political
Hobbies (other than swimming): Hanging out with friends and helping others