providers of drinking water and sanitation services in urban areas. SISS sets rates for sanitary services for the economy ministry, oversees compliance with norms, and regulates the control of environmental waste. National Irrigation Commission (CNR)- Created in 1975, CNR is a legal body under public law. The primary objective of CNR is to develop and improve irrigation and drainage infrastructure throughout Chile. A historical snapshot of Legal and Institutional Changes in the Water Sector (1977–2005): Source: Peña, Humberto. Ministry of Public Works : Chile International agreements With Argentina. In 1991, an environmental treaty between Chile and Argentina was signed and within the treaty there is a "Protocolo de acuerdo" or framework agreement regarding shared water resources between the two countries. The framework agreement seeks to regulate the 'non-transfer" of pollution through waterways (rivers, aquifers,lakes, pipes) from one country to the other. This agreement, while it has not yet become effective is still considered by the FAO to be a global framework on negotiating this kind of agreement. In May 2009, representatives from Argentina and Chile met to formalize a request to their respective Ministers of Foreign Affairs. The request asks that the objectives of the 1991 protocol of shared water resources be complied with. Objectives in Article I of the protocol state, "the parties shall agree that the actions and programs concerning the use of shared water resources be undertaken under the concept of integrated management of the watersheds." With Bolivia. Historically, there had not been agreements regarding water resources with Peru or Bolivia. Furthermore, Bolivia and Chile have been feuding over the use of the Silala waters for many years. Bolivian officials allege that because the Silala waters are born from 94 springs in Bolivia, it should be compensated by Chile for their use of the water. Chile and Bolivia were reported to be close to an initial agreement following a meeting in Santiago on April 3, 2009. The agreement would require Chile to pay for 50% of the Silala waters, to be paid by Chile's state copper company Codelco and by Ferrocarril Andino, a Chilean group investing in rail. Additionally, Bolivia's foreign relations minister David Choquehuanca has proposed a daily extraction fee totaling about US$6 million per year. Talks have continued in May 2009 to advance details of the international water sharing agreement. Environmental issues Potential climate change impacts See also Glaciers of Chile According to the British