Please visit the capturing stormwater as a source for reuse resources page for information about how stormwater can be used for onsite non-potable reuse applications.

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The following are a sampling of the key water sector resources that are freely available to support water practitioners interested in developing onsite water reuse projects. Visit the Water Reuse Information Library for additional water reuse materials.

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Corkscrew Swamp Sanctuary contains a system—a “Living Machine®”—that treats wastewater generated onsite from the facility restrooms and recycles it for toilet flushing, effectively reducing demand on potable, freshwater supplies and helping to conserve groundwater. As visitor attendance at the sanctuary increased, the amount of wastewater generated onsite also increased to a level beyond the capacity of the old septic system. The sanctuary responded by installing an innovative treatment system, the Living Machine®, that employs plants and microorganisms instead of a traditional onsite wastewater treatment system. The Living Machine® also provides other benefits, such as educating the sanctuary’s visitors about the ability of natural wetlands to improve water quality and being aesthetically appealing.

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The following states developed guidelines and regulations for onsite non-potable water reuse applications. Select the links to explore summary documents from the REUSExplorer, which include types of onsite non-potable reuse approved by each state, reuse specifications, laws and policies, and more!

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Thousands of residents in rural Alaska lack access to running water or flush toilets due to their remote locations and the local climate. To address this issue, the Alaska Department of Environmental Conservation (DEC) funded the Alaska Water and Sewer Challenge - a research and technology development competition intended to identify a suitable decentralized water reuse solution for use in rural Alaska homes. The DEC solicited designs that could safely and affordably supply homes with clean water but were also acceptable for the end users and feasible for implementation in rural Alaska. The winning design consisted of an onsite greywater recycling system coupled with urine-diverting dry toilets, which could significantly reduce the reliance on imported water for non-potable uses. Since the system avoided the use of water for flushing toilets, it limited the need to export sewage for treatment and disposal. As of this publication in June 2023, the selected design was progressing toward the implementation stage.

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A new redevelopment project which is under construction in Brooklyn has incorporated reuse into its design. Specifically, this reuse project is part of the revitalization of the historic Domino Factory, and consists of a non-potable water reuse system which will collect and treat wastewater from five newly constructed buildings and reuse it for toilet flushing, cooling tower make-up and irrigation in three of those same buildings. Half of the treated wastewater will be reused onsite and the remainder will be discharged directly to the East River after treatment. Non-potable reuse will significantly reduce the demand on the water supply in the rapidly developing neighborhood by offsetting the use of potable water. Onsite treatment and reuse also mitigates the impacts of combined sewer overflows by diverting wastewater away from combined sewers and lowering pressure on downstream wastewater treatment facilities.

Water reuse is the practice of reclaiming water from a variety of sources, treating it, and reusing it for beneficial purposes. The following resources relate to onsite non-potable reuse; for information on other uses, please visit the Water Reuse Resource Hub by End-Use Application.

Onsite non-potable water reuse is water that is collected from onsite sources, such as greywater collected from a sink, appropriately treated, and used for non-potable applications at the single-building or water district scale. Applications can include toilet flushing, dust control, soil compaction, fire protection, commercial laundries, vehicle washing, street cleaning, snowmaking, and other similar uses. Onsite non-potable water systems can help to mitigate the demand on freshwater supplies and reduce the volume of water entering a sewer system, which can be especially helpful during flood events. By reusing water onsite, communities can lower their overall energy demands and carbon emissions, partially due to the reduced need to transport treated water great distances.