2011 by ONEA enabled water production capacity at the Ziga treatment centre to be increased with a production capacity of 66% of the total consumption of potable water for the Ouagadougou population. The number of ONEA centres increased from 42 in 2006 to 46 in 2011 and 48 in 2012, the target is to attain 56 by 2015. c) Procedures for disconnecting water services and waste systems 248. As a result of the social nature of the water supply system, the procedures for disconnecting water and waste disposal systems are in line with the rules contained in the service regulations. Thus, before any disconnection of water and waste disposal services, the National Water and Sewerage Corporation informs the concerned consumers in advance through the media and a reminder is served for unpaid water bills. Furthermore, ONEA has a legal department to investigate claims by citizens in case of violation of their rights. d) Protection of natural water resources from contamination by harmful substances and pathogens in particular by extractive industries 249. The importance ascribed by Burkina Faso to environment is shown first of all in the preamble to the Constitution which affirms the absolute need to preserve environmental resources. The environmental and social impact assessment (ESIA) therefore a legal instrument for the implementation of the principle of prevention for anticipating the damage that could be inflicted on the environment through human-induced activities. A lot of legislative and regulatory texts have been adopted for the promotion and protection of the environment, water resources and the preservation of the health of the population. The most important ones are : - Law No. 17-2014 AN of 20 May 2014 on the prohibition of the production, importation, marketing and distribution of non-bio-degradable plastic packages and sachets; - Law No. 006-2013/AN of 22 April 2013 on the environmental Code of Burkina Faso. 250. At the institutional level, at least three (3) Ministries are directly concerned with mining exploitation activities in Burkina Faso, namely : - The Ministry of Mines and Quarry is responsible for the development and implementation of the Government policy in the area of the development of energy and mining In the area of mining, it is responsible for the:  Intensification of geological and mining research and the management of mining heritage ;  Boosting gold production ;  Controlling industrial and mining safety and the quality of mining products ;  Strengthening the capacity for the administration, promotion, monitoring and control of the mining sector. - The Ministry of Environment and Sustainable Development is the guarantor of the institutional coordination of the quality of the environment of Burkina Faso. In this regard, it ensures the implementation and monitoring of government policy in the area of environmental protection and sanitation. As part of the exercise of this mission, it depends on the National Environmental Assessments Bureau (BUNEE) which is responsible for the implementation and technical monitoring of the environmental policy. 63