; and (B) to set a maximum contaminant level under the Safe Drinking Water Act ( 42 U.S.C. 300f et seq.). (10) In the 1970s, the Air Force began purchasing and using aqueous film-forming foam containing PFOA and PFOS for extinguishing petroleum fires and during firefighting training activities. (11) The Air Force has used a proactive, comprehensive approach to identify installations where aqueous film-forming foam containing PFOA or PFOS has been used and there is a suspected release that may impact drinking water and expose humans to PFOA and PFOS. (12) The Air Force uses authorities granted under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 ( 42 U.S.C. 9601 et seq.) and the Defense Environmental Restoration Program under chapter 160 of title 10, United States Code, to ensure that no one is drinking water containing unacceptable levels of PFOA or PFOS due to Air Force activities. (13) The Air Force provides alternative sources of drinking water, including filters or connections to public utilities, to provide longer-term assurances that individuals are not drinking water containing unacceptable levels of PFOA or PFOS. (14) The Air Force asserts that authorities under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 ( 42 U.S.C. 9601 et seq.) do not extend to the provision of clean water for livestock or agricultural purposes. (15) Livestock and agriculture are produced for human consumption in items such as milk and dairy and provide a direct pathway for human exposure to PFOA and PFOS. (16) Under section 634 of the Departments of Commerce, Justice, and State, the Judiciary, and Related Agencies Appropriations Act, 1998 ( Public Law 105–119