Island Water Systems is an independent , full service water treatment company , specializing in the installation , service , and ongoing maintenance of domestic and commercial water filters , purifiers , and conditioners . We have the expertise to service your existing equipment , install a new system , or rebuild your present one. Each and every Island Water Systems unit is assembled in-house , by hand , with strict attention to quality control . We personally select and field test every component before incorporating it into our system design. We are local based on Martha's Vineyard so why would you go anywhere else !!