A) The Drainage System 577. The substantial efforts undertaken in this domain have consisted notably in developing extensive infrastructure which required thousands of millions of Dinars in terms of investment. These efforts made possible an increase in the number of connections made for the inhabitants to the « National Cleansing Service » (ONAS) network from 1.9 million in 1987 to 4.7 million in 2004. This investment also benefited 600 working class areas with about one million inhabitants. It allowed the realization of rural drainage programmes and also contributed to the consolidation of the country’s capacity to recycle collected waste water, thereby making possible considerable break throughs in the protection of water and underground sources against pollution and contamination. B) The control of industrial pollution 578. The State policy in the area of control of industrial pollution had been considerably consolidated in the past years. In this context, several measures had been taken and major projects had been programmed including notably the realization of a phosphogypsum dump site in Gabès, at a totoal cost of 150 million Dinars, the development of the zone at a cost of 90 million Dinars, the development of the shores of the lakes North and South of the Capital, the adoption of clean production in the national cellulose and halfa paper factory, the programming of numerous anti-polluant pilot projects in the phosphate washing centres of the mining basin. Subventions totalling 15 million Dinars had also been allocated to the small industrial enterprises for the realization of pollution control projects, allowing the reduction of the pollution caused by 340 industrial units. C) The treatment of solid and household waste 579. The policy engaged in this domain is based on a full array of instruments aimed at reinforcing the means and equipment for the collection of household waste, both at the level of the cities and the municipalities, the generalization of the controlled public dump sites, the installation of screening centres and the improvement of hospital waste management through incineration. 580. Pertaining to household waste and its management, the national effort provided during the past decade has allowed the completion of 5 controlled dump sites and the commencement of the development of 9 others in different regions of the country. Investments estimated at 75 million Dinars are programmed for the collection of about 85% of household waste in the controlled dump sites. For the purpose of consolidating the control of solid waste, specific programmes had been designed such as the Eco-Lef programme which has, since its creation in 1998, set up 120 remunerated collection centres of plastic waste, allowing the collection of almost 16,000 tons of this waste of which 90% had been recycled. Currently the project works for the development of a treatment unit of industrial waste have commenced. The cost of this project totals 32 million Dinars. D) The control of desertification and the preservation of waters and soils 581. Several activities had been engaged for the protection of the factors of production in a domain considered vital for guaranteeing sustained food security 121