Can right-based approach resolve equity problem in Water and Sanitation Services?

Despite global effort to ensure universal access to improved water, sanitation and hygiene services, inequity makes process assessment difficult. It is very common to see one community having so many improved sources within a square Km and another having none. I have witness such cases both in Uganda and South Sudan. Wealth of reasons might exist including security, but when one interact with planners and implementers, the common word you may hear is "demand-driven project approach". However, you get deep to understand the process used, you might find that demand-driven was used instead of need-driven approach. Now as we are obliged to aim at universal access, can we apply right-based approach to water and sanitation programming? Like in the case of need-driven approach, what will be the implication on sustainability?