In the city of Sanaa itself, there was a continuous expansion of tap water supply under the National Water and Sanitation Authority (NSWA) through the end of the 1990s, but it was outpaced by the city's growth. The public water supply only served 40-50% of Sanaa residents by 2000. The percentage has decreased in recent years: in 2009, it was estimated that 55% of residents were connected to the public water supply; in 2018, only 43% did. Access to tap water is also inconsistent between neighborhoods, and even in places where there is public water, water pressure can be too low, resulting in unreliable access for some households. Most households have access to water for less than one full day per week. There are also problems with pipe leakage, with estimates ranging from 40% to 60% of water being lost due to leaks.