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Drinking water is sourced from the aquifers in areas of the Koʻolau & Waiʻanae Mountain ranges and pumped to your home via water mains.
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Untreated wastewater is conveyed through sewer mains from the Windward Shore of Oʻahu from Makapuʻu Point to Bellows Air Force Station. The wastewater then arrives at the Waimānalo Wastewater Treatment Plant where it receives secondary treatment and undergoes further processing through a sodium Hypochlorite disinfection system.
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The entirety of the wastewater received at the Waimānalo WWTP is disposed of through 10 underground injection wells at the facility, all approximately 200 feet deep.
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Treated wastewater flows through groundwater toward the Pacific Ocean, where it emerges often through the reef itself, via openings that present as direct pathways from the wastewater treatment plant to the reef.
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Oʻahu's Drinking Water Sources
Oʻahu relies solely on underground water sources for drinking water which are all dependent on three natural elements: northeast trades, high mountain ranges, and the island's geological landscape. The NE tradewinds drive clouds filled with moisture inland, the high mountain ranges (Koʻolau mountains and Waianae mountains) capture and force moisture-filled clouds to higher elevations which causes rainfall on watershed areas. The Hawaiian Island geological landscape serves as a natural filter and underground storage system of water. Rainwater percolates into the earth, filtered by volcanic rock, and stored in aquifers. The aquifers are an underground freshwater reservoir storage from which the Board of Water Supply sources water to deliver to homes. Water is pumped from a network of shafts, water tunnels, and many wells located all over Oʻahu, (except for the North Shore area) and conveyed to homes through mains, booster systems and reservoirs.
- Waimānalo Wastewater Treatment Plant Facility
Do You Know What Happens After You Flush?
