Onsite Non Potable Water Reuse Research Innovative Strategies and Implementation Guidelines

Steven Aug 11, 2026

Onsite Non

How To Make A Grey Water Recycling System
How To Make A Grey Water Recycling System

Onsite non-potable water reuse is one solution that can help communities reclaim, recycle, and then reuse water for non -drinking water purposes. Onsite non-potable water reuse systems (ONWS) capture and treat water sources generated from within or surrounding a building, such as wastewater, greywater, stormwater, or roof collected rainwater.

Development and testing of a modular nature based technology
Development and testing of a modular nature based technology

Research Focus EPA's onsite non-potable water reuse research is focusing on three areas: (1) risk-based modeling to define the necessary level of treatment to safely reuse locally collected wastewater for non-potable purposes in and around buildings; (2) describing and quantifying the microorganisms, both bacterial and viral, found in these ...

Onsite Non

Greywater Recycling for Smart Irrigation Benefits System Integration
Greywater Recycling for Smart Irrigation Benefits System Integration

Onsite non-potable water reuse systems (ONWS) capture and treat water sources generated from within or surrounding a building, such as wastewater, greywater, stormwater, or roof collected rainwater. The treated water is then reused onsite or locally for non -drinking purposes, such as toilet flushing, clothes washing, and ornamental plant ...

National Blue Ribbon Commission for Onsite Non-potable Water Systems builds upon years of research and collaboration by leading by water utilities, public health officials, and national research foundations. The materials below include resources to support local implementation of onsite non-potable water reuse programs.

Solar Distillation Purifying Water with Sunlight
Solar Distillation Purifying Water with Sunlight

Resources for Onsite Water Programs

Onsite Water Systems build upon years of research and collaboration by leading water utilities, public health officials, and national research foundations. The materials below include resources to support local implementation of onsite non-potable water reuse programs. Check back for updates and publications from the commission.

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.

Greywater Systems A Sustainable Solution for Bondi Homes Drip To Dry
Greywater Systems A Sustainable Solution for Bondi Homes Drip To Dry

Onsite Water Reuse

Purpose The Onsite Water Reuse Program allows for the collection, treatment, and use of alternate water sources for non-potable applications in individual buildings and at the district-scale. Who Must Comply? Onsite water reuse systems are required for new development projects of 100,000 gross square feet or greater in San Francisco.

What is the WRPG? The award winning " Onsite Non-Potable Water Reuse Practice Guide'' (WRPG) was developed by the William Worthen Foundation, and published in 2018. This project was completed with funding and in-kind support from Google, AIA-CA, Charles Pankow Foundation, Magnusson Klemencic Associates, City of Santa Monica, and the Water Environment & Reuse Foundation. Since publication ...

Onsite Non Potable Water Reuse Research
Onsite Non Potable Water Reuse Research

PDF ONSITE NON

Onsite non-potable water systems are systems that "collect wastewater, stormwater, rainwater, and more, and treat it so that it can be reused in a building, or at the local scale for non-potable needs such as irrigation, toilet flushing, and cooling. These systems are usually integrated into the city's larger water and wastewater system and contribute to a more resilient and sustainable ...

How To Use Greywater For Toilet
How To Use Greywater For Toilet
An Assessment of Treated Greywater Reuse in Irrigation on Growth
An Assessment of Treated Greywater Reuse in Irrigation on Growth
Decentralized Water Recycling Systems for Urban Biodiversity
Decentralized Water Recycling Systems for Urban Biodiversity
How to Use Greywater for Irrigation A Comprehensive Guide Soildrops
How to Use Greywater for Irrigation A Comprehensive Guide Soildrops
Greywater recycling system in a home with pipes leading to a garden
Greywater recycling system in a home with pipes leading to a garden
Water sensitive urban design technologies
Water sensitive urban design technologies

San Francisco's Onsite Water Reuse Program In September 2012, the City and County of San Francisco adopted the Onsite Water Reuse for Commercial, Multi-Family, and Mixed-Use Development Ordinance. Commonly known as the Non-potable Water Ordinance (NPO), it added Article 12C to the San Francisco Health Code, allowing for the collection, treatment, and use of alternate water sources for non ...