Sector Water Supply and Sanitation in Colombia does not have methodology to qualitatively and quantitatively measuring the current situation and future physical infrastructure and use of water and sewage systems, making it diffi cult to state checks, track effi cient and safe performances with respect to actions, prioritized, technical investment, fi nance and management. Most localities have health physical infrastructure, but clearly the reduced effi ciency that maintains, improves, operates and / or rehabilitation, resulting in low coverage and water unfi t for human consumption and therefore morbidity and mortality in serious trouble. There arises the need for a methodology for assessing the existing health and physical infrastructure in use to evaluate and rate the quality, quantity, coverage, continuity, longevity and hydraulic and structural behavior of each system. The failings of the investment refl ects the state of abandonment of many components of the systems never became operational or others who were not required. The worst example refl ects the situation in which 80% of water treatment plants for consumption that exist in the 47 urban localities of the Department of Tolima (Colombia) in which the methodology was applied, once built never entered operation, in addition, most investments in water supply systems are focused on expanding the capacity of water uptake, though in most cases is not required.