Millennium Development Goal target 7c sought to improve global access to safe water and sanitation, but different benchmarks were used to monitor "improved" access; the water benchmark is community-level access, and for sanitation it is household-level. Household-level sanitation is considered safer than shared sanitation, yet the relative health impacts of access to shared water sources and water supplies on premises have not been established. An analysis evaluated global progress towards water and sanitation targets under alternative benchmarks, and a systematic literature review was conducted to compare the relative health impacts of using shared water sources and at-house water supplies. Results indicate that water and sanitation have s...