WLAX to Pac12 Pac 12 is always looking for wrestling schools. Right now only three full-fledged Pac-12 schools have wrestling teams; Stanford, Arizona State and Oregon State. To reach the minimum of 6 teams for NCAA purposes they've extended affiliate memberships to Cal Poly, CSU-Bakersfield and Arkansas-Little Rock. UC Davis used to be a Pac-12 affiliate in wrestling. I don't think SFSU ever was. They continue to wrestle at the D-2 level as a member (probably affiliate...) of the D-2 Rocky Mountain Athletic Conference where they went 0-5 this past year. I can only assume the Pac 12 requires a team to at least compete at the D-1 level to even be an affiliate member in any sport. That makes some sense and would explain why wrestling was the only acknowledged D-1 program at one time.
Cal Baptist is a struggling D-1 wrestling program. They will be wrestling as an affiliate in the Big 12. Good luck to them there. Former UCD head coach Lenny Zalesky just announced his retirement as head coach at CBU. Derek Moore, UCD's only D-1 champion, has been named interim head coach.
(Wouldn't it make more sense for Cal Baptist to wrestle in the Pac 12 and Arkansas-Little Rock in the Big 12?)
Men's water polo, like men's volleyball, does not sponsor different levels of post season play. There is one single tournament. It is, as expected, dominated by the four California Pac 12 schools who compete in the Mountain West Sports Federation as there are not the required six teams and the conference has not seen fit to follow wrestling and offer affiliate memberships to other schools.
The small Southern California Schools, I think all of which are D-3, would send their conference water polo champion to the NCAA's with the expected result. A few years ago they created a post season national D-3 tournament and no longer competed in the NCAA post-season tourney. Not sure it that has survived the pandemic.
I doubt that inviting UCD and SDSU to join the Pac-12 for women's lacrosse is going to be a game changer in the near future. Not sure why the conference invited the schools other than as a courtesy and perhaps a scheduling convenience. You could put the schools in divisions similar to the football divisions with SDSU in a southern division and UCD in a northern one. They also have a history of competing against each other in the MPSF until Arizona State elevated its club lacrosse team to varsity and the conference now had six schools so the schools left the MPSF and established women's lacrosse as a conference sport. That and unlike men's water polo there are not a lot of other D-1 women's lacrosse programs, so UCD and SDSU were alone in the wilderness. There are a lot of men's water polo programs throughout California which are spread out over the Southern California Intercollegiate Conference, the Western Water Polo Ass'n and the Golden Sun Conference.