The woman had swum in July in the pool in Emerainville, east of Paris, in the "burkini" - a loose-fitting garment resembling a wetsuit with a hood.
But staff stopped her from swimming in August, citing hygiene concerns.
It comes as the government examines ways to limit burka use after the president said they reduced dignity.
France is home to Western Europe's largest population of Muslims, with about 5 million living there.
At the pool, staff "reminded [the woman] of the rules that apply in all (public) swimming pools which forbid swimming while clothed,"