The Independent Soccer League (ISL) is a girls-only league for sports competition even though some member schools are coeducational.
CSOA provides officials for the five member schools that are in Northern Virginia
The ISL competes in two divisions, "A" and "AA," with end of season tournaments in each division. Typically, the finals are held at Episcopal and CSOA provides the officials. Episcopal, Madeira, Potomac, and St Stephens/St Agnes compete in division "A." Flint Hill competes in division "AA."
The additional schools in division "A" are: Holy Child, National Cathedral, and St Andrews.
The additional schools in division "AA" are: Georgetown Visitation, Bullis, Georgetown Day, Sidwell Friends, Stone Ridge, Holton-Arms, and Maret.
Rules can be found under the Referee tab.