This sport center is located in Avellino, about 45 minutes from the Support Site. It is beautiful and offers tons of activities. My husband plays soccer there all the time. If you are at the home page under the words Attivita` Sportive click Piscine Coperte (covered pools) under that listing will be all kinds of water sports including Pallanuoto written in bold.
I know that people from all over the area come here to practice a variety of sports and they can certainly give you more info about regional teams. Pro teams often host kid/teen sport camps for basketball, soccer etc..If you'd like me to call and get more info for you before you arrive just let me know, we'd be happy to help :)