; and (II) not later than 30 days after the end of any hydraulic fracturing operations, the list of chemicals used in each underground injection during such operations, including identification of the chemical constituents of mixtures, Chemical Abstracts Service numbers for each chemical and constituent, material safety data sheets when available, and the volume of each chemical used. (ii) The State or the Administrator, as applicable, shall make the disclosure of chemical constituents referred to in clause (i) available to the public, including by posting the information on an appropriate Internet Web site. (iii) Whenever the State or the Administrator, or a treating physician or nurse, determines that a medical emergency exists and the proprietary chemical formula of a chemical used in hydraulic fracturing operations is necessary for medical treatment, the person conducting the hydraulic fracturing operations shall, upon request, immediately disclose the proprietary chemical formula or the specific chemical identity of a trade secret chemical to the State, the Administrator, or the treating physician or nurse, regardless of whether a written statement of need or a confidentiality agreement has been provided. The person conducting the hydraulic fracturing operations may require a written statement of need and a confidentiality agreement as soon thereafter as circumstances permit. (B) Subparagraphs (A)(i) and (A)(ii) do not authorize the State (or the Administrator) to require the public disclosure of proprietary chemical formulas. . 303. Risks of drought to drinking water Part E of the Safe Drinking Water Act ( 42 U.S.C. 300j et seq.) is amended by adding at the end the following new section: 1459C. Drought risk assessment and management (a) Strategic plan (1) Development Not later than 90 days after the date of enactment of this section, the Administrator shall develop and submit to Congress a strategic plan for assessing and managing the risks of drought to drinking water provided by public water systems. The