Measuring access to water in a post-2015 era involves taking into account the human rights framework. Therefore, its content should be considered to conceptualize the level of service through adequate indicators and to follow-up inequities reduction at global, national and local level. This research develops and tests a methodology to measure intra-community disparities based on human right to water normative criteria through a stratified sampling, splitting households served by community based organizations and those selfprovided. This approach implies considering much reduced populations, thus special care needs to be taken with sample sizes and uncertainty of estimators. The proposed methodology is practical to locate and accurately characterize minority sectors within rural communities and allows moving beyond centraltendency estimators. It implies higher costs for field data collection than traditional approaches, but nevertheless, the over-investment can be assumed economically feasible and extremely relevant from a human rights perspective taking into account the imperative need to have adequate tools for equity-oriented policy making at local level. The research point out how results might be used to shape decision-making processes.