Filters don't do anything for bromates. The ban is on the French side, La Vista is on the Dutch side. Either the Dutch side city water doesn't have the same bromate problem as the French side, they have a different standard, or they don't test for it.

For many years I rented villas which often used cistern water, which was free, rather than the more expensive city water. So yes, I brush my teeth with bottled water.