Water Management in Iran
According to Iran’s water legislation, three ministries are directly responsible for water resources assessment and development:
1.The Ministry of Energy (MoE) has two responsibilities: energy supply and water resources. As far as irrigation is concerned, it is in charge of the construction of large hydraulic works, including dams and primary and secondary irrigation and drainage canals for the distribution of water. Within the MoE, the Deputyship for Water Affairs is responsible for overseeing and coordinating the planning, development, management and conservation of water resources. This deputyship consists of the following sections: Water Resources Management Company (WRMC), Provincial Water Authorities (PWA), Irrigation and Drainage Operation and Maintenance Companies (O&M). WRMC is the mother company that manages all water sectors within the MoE, except drinking water distribution for rural and urban areas. PWAs are responsible for the water sector, including irrigation and drainage development and operation, in each province. Drinking water distribution is the responsibility of provincial water and wastewater companies. O&M companies are responsible for modern irrigation and drainage operation and maintenance. Forty-nine per cent of the shares of these companies is held by the MoE and 51% is held by the private sector. There are 19 O&M companies working under the supervision of the PWAs. 
2. The Ministry of Agriculture (MoA) is responsible for supervising rain-fed and irrigated crop development. Whereas the MoE is in charge of water management from the river source up to the level of secondary irrigation canals, the MoA is in charge of subsurface drains, tertiary and quaternary canals as well as farm development and irrigation techniques, planned and operated by the Provincial Agricultural Organizations and the Deputy Ministry for Infrastructure Affairs of the Ministry of Agriculture. 
3. The Department of the Environment (DoE) is responsible for drafting environmental protection policies and the laws, directives and systems necessary for evaluating the environmental impacts of social and economic development projects, particularly irrigation and hydropower projects, and monitoring their implementation.The Ministry of Health and Medical Education is in charge of monitoring the physical, chemical, biological and bacteriological quality of drinking water from its source to consumption points.
Also, The Ministry of Health and Medical Education is in charge of monitoring the physical, chemical, biological and bacteriological quality of drinking water from its source to consumption points.