The Obama administration tightened rules on hydraulic fracturing late last week, requiring the disclosure of chemicals used in the process when done on federal and American Indian lands. The new rules will also require additional testing of oil and gas well construction and require the industry to have a management plan for the water used in the process. “This proposed rule will strengthen the requirements for hydraulic fracturing performed on federal and Indian lands in order to build public confidence and protect the health of American communities, while ensuring continued access to the important resources that make up our energy economy,” the Interior Department said in a statement. The move is part of a broader administration effort to increase rules for the controversial practice. Earlier this month, the Environmental Protection Agency tightened air pollution requirements for new oil and gas wells.