D20 swam for several years and is attending a D1 school, but she is not swimming and did not go through the recruiting process. Any info I have, I have gotten from parents of her teammates or preliminary research of my own before we started the application process.
The one thing I will suggest is to start with researching his times along with times for various athletic conferences and current swimmers on teams. Just because he qualified for sectionals doesn’t mean he is competitive enough for spots on specific teams, or that the team has a need for his event for this recruiting cycle. Also, swimming usually offers very few scholarships, and for comparative little money. A D1 team can offer 9.9 scholarships according to NCAA rules and, often, schools divide that number evenly among all team members (average team size is 29 or so); D2 can offer 8.1 scholarships with a slightly smaller team.