The challenges include water scarcity in the northern and central parts of the country; inadequate water service quality (drinking water quality; 11% of Mexicans receiving water only intermittently as of 2014); poor technical and commercial efficiency of most utilities (with an average level of non-revenue water of 43.2% in 2010); increasing the national percentage of fully sanitized water which at 57%, is considered to not be enough, as the country's theoretically available percentage of water per capita is 60% lower than it was 60 years ago; and the improvement of adequate access in rural areas. In addition to on-going investments to expand access, the government has embarked on a large investment program to improve wastewater treatment.