Chit, PhooDassen, JessicaLewis, MeganRothman, JessicaWilson, LaurenWinik, JasonFinal project for ENSP400: Capstone in Environmental Science and Policy (Fall 2017). University of Maryland, College Park.The Montgomery County Parks Department needs to adopt an alternative water source to secure the future of their water supply at their Damascus and Cabin John facilities. A greywater system is a viable option. Greywater is a sustainable, innovative water source collected from sinks and ice shavings for reuse options, conserving water, and reducing energy. Construction and design of these facilities will require new and retrofit strategies. As greywater contributes to a significant percentage of wastewater in public areas, including parks and ice rinks, a proper treatment system is required to remove bacteria and organic compounds. One such system is the Aqua2use Greywater Treatment System, which is a storage and sanitation system that is appropriate for non-potable water reuse and is economically beneficial. This document provides the blueprints, permits, costs, and the distribution and treatment processes for a greywater system for new and retrofit facilities. Case studies conducted at the Lee Valley facility in England and the Citizen Bank Arena in Ontario, California will aid in determining the design and construction of the greywater ice rink system. Studying the implementation of a greywater system in Spain will help determine the organization of a new or retrofit system. Quantitative assessments of water usage from toilets and ice rinks at the Cabin John facility, accompanied by indirect expense reductions that a greywater system generates, will aid in determining implementation costs. These systems will also comply with the plumbing code of Maryland, EPA’s 2012 water reuse guidelines, and the 2011 NSF/ANSI 350 for design, operation, and monitoring requirements. This paper aims to propose a system that provides alternate reuse options projecting at least a 30 percent reduction in water consumption. This result came from the Rockville 2017 Water Quality Report, which concluded that the use of an alternate toilet-flushing program resulted in a 40 percent decrease in water consumption when using an alternate non-potable water source.en-USTechnical Report