To ensure the river was Olympic-ready, Paris invested $1.5 billion into the cleanup effort, known as the “Swimming Plan.” As a result, more than 20,000 homes that were previously dumping wastewater into the Seine have now been integrated into the sewer system, significantly reducing the amount of pollution seeping into the river.

Authorities have reopened the Seine river in Paris to public swimming for the first time after a century-long ban. Here's what you need to know.

Parisians will be able to swim in the Seine, providing much-needed relief as summer temperatures break records.