Big Blue Swim School O'Fallon empowers kids with the skills they need to feel confident in the water — laying the foundation for a lifetime of enjoyment! Our professional, adult instructors are all about teamwork, getting into the water with swimmers and adapting lessons to revolve around each individual. In fact, we're proud to be the best swim school in the area, offering programs for all ages, with continuous weekly lessons available year-round, so your child can start and stop any time.