I agree with all of the above it would be a good idea to get the Hep a/b vaccine.
He needs get the HAV and B vaccine regardless if he goes swimming or not. If he does choose to go, the HAV vaccine may come in quite handy if it turns out that a Babe Ruth looking thing come floating by.
Going to the pool is safe for you as well as for other swimmers. Hepatitis C or B can not be transmitted by using the pool.
I second what Trin says.
I think you both should get the hep A and B vaccine. It is called Twinrix and consists of 3 vaccines at 0, 1 and 6 months.
Anyone with Hep C should be innoculated with the Hep A and Hep B vaccine. No, I would not be concerned and do not think it's dangerous. You are at far greater risk of catching E. coli from a public pool.
Trinity