Mahinahina utilizes pre-sedimentation to treat raw surface water. Rapid mix, flocculation, and direct filtration with a mixed media filter are used. After this process, chlorine is added for disinfection. Treated surface water is the primary source of water for Upcountry and Lahaina. Monthly pumping and treatment data is available in the chart below.
Numbers below are daily averages in thousands of gallons.
Mar. 2001 Apr. 2001 Prev. The hydrologic cycle goes on and on. After you use water, it eventually returns to the ocean through various disposal outlets. However, there is the same amount of water today as there was when the Hawaiians first settled on the islands. There's just a lot more people using the same amount.