uskoolfish -- it will depend on the school. I used to teach at a school that required students in private lessons to pay an additional performance studies fee. This was to cover the cost of an accompanist. The accompanists were then assigned to the students by the dept.
Where I teach now there is no additional performance studies fee, but students are required to secure an accompanist for themselves. Some are able to find a student in the accompaniment class to work with them in that semester for credit. Most find an accompanist (usually a student or a freelance accompanist who works with students at the university) and pay them out of pocket.
This might be a good question to ask during audition information sessions.