%0 Journal Article
%K modeling
%K labeling
%K efficiency
%K impact assessment
%K EPA
%K certification
%K WaterSense®
%A Jonah Schein
%A Peter T Chan
%A Yuting Chen
%A Camilla Dunham
%A Heidi Fuchs
%A Virginie E Letschert
%A Michael A McNeil
%A Moya Melody
%A Sarah K Price
%A Hannah Stratton
%A Alison A Williams
%B Water Supply
%D 2018
%G eng
%R https://doi.org/10.2166/ws.2018.136
%T Methodology for the national water savings models– indoor residential and commercial/institutional products, and outdoor residential products
%U https://iwaponline.com/ws/article/19/3/879/62405/Methodology-for-the-national-water-savings-models
%8 07/2018
%@ 1606-9749
%X <p><span>Since 2006, the U.S. Environmental Protection Agency (EPA) has operated WaterSense® in partnership with manufacturers, utilities, and consumer groups. Similar to EPA's ENERGY STAR® role for energy-efficient products, WaterSense® employs a labeling system to identify water-efficient products, homes, and services. As of 2015, the WaterSense® program can claim credit for a total savings of 1.5 trillion gallons of water and $32.6 billion in consumer water and energy bills. Savings are tracked in the National Water Savings (NWS) model that combines innovative analyses with methodologies established in the energy sector. Merging life-cycle cost and national impact analysis models, the NWS model estimates savings from a bottom-up accounting method for individual products. The model extends those savings to the national level by employing parameters such as frequency of product use by a number of people and building type, product lifetime, stock accounting, and market saturation. The NWS model tracks the water and consumer monetary savings of WaterSense-labeled products for residential and commercial water use both indoors and out.</span></p>