Mustang girls play in the ECNL.
The ECNL Northern Cal boys conference for the 2020-2021 season is slated to have 10 clubs. It will feature a promotion/relegation playoff, where the last-place club in the ECNL will play off annually against the first-place club in NorCal’s NPL Division to determine the final member of the conference for the subsequent year.
Besides Mustang, other teams committed to the Northern Cal Conference will be Davis Legacy, Marin FC, MVLA, San Juan Soccer Club, and Santa Rosa United.
A little more info on the Mustang news: http://www.mustangsoccer.com/mustang-joins-the-boys-ecnl