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Rainfall on Kauaʻi's watershed areas recharges the island's underground aquifers, which serve as the primary source of drinking water. The Kauaʻi Dept. of Water pumps water from deep wells that tap into these aquifers and distributes it to homes and businesses through a network of water mains. The Department oversees 9 public water systems across the island that serve the community. Homes not connected to the municipal water system rely on rainwater catchment systems, or private groundwater wells, to collect and supply water for household use.
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Untreated wastewater from within the Wailua & Kapaʻa area is conveyed through sewer mains to the Wailua/Kapaʻa Wastewater Treatment Plant, where it undergoes secondary treatment and disinfection.
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All wastewater received at Wailua/Kapaʻa Wastewater Treatment Plant undergoes secondary treatment & disinfection. The treated effluent is then discharged into the ocean through a deep ocean outfall located ~670ft offshore.
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Treated wastewater flows through an outfall pipe and is discharged into receiving waters (the ocean). Once introduced, the wastewater can mix with the seawater and be carried by currents to nearby coral reefs, potentially affecting the health of these
ecosystems (Lapointe 1997, Sutherland et al. 2010, Redding et al. 2013, Vega Thurber et al. 2014, Prouty et al. 2017).
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Kaua‘i's Drinking Water Sources
Kauaʻi relies primarily on underground water sources for drinking water, which are all dependent on a combination of natural factors: northeast trades, high mountain ranges, and the island’s geological landscape. The NE tradewinds drive clouds filled with moisture inland, mountain ranges like Mount Waiʻaleʻale & Kawaikni capture and force moisture-filled clouds to higher elevations which result in rainfall on watershed areas. Kauaʻi’s volcanic landscape serves as a natural filter and underground storage system of water. Rainwater percolates into the earth, naturally filtered by porous volcanic rock, and stored in aquifers. The aquifers are an underground freshwater reservoir storage from which Kauaʻi’s Department of Water Supply sources water to deliver to homes. Water is pumped from a network of shafts, water tunnels, and many wells, then conveyed to homes through mains, booster systems and reservoirs.
- Wailua-Kapa‘a Wastewater Treatment Plant Facility
Do You Know What Happens After You Flush?
