For decades, millions of gallons of treated sewage water has been pumped into the ground to fight sea-level rise. While this process sounds harmful, it’s actually quite the opposite, according to experts. It is crucial in keeping salt water out of aquifers and keeping groundwater replenished. To date, nearly 490 billion gallons of recycled water have been recharged into the Central and West Coast Basin aquifers. That is one of many water recharge projects occurring all over the world.