10 CFR § 217.2 - Priorities and allocations authority.
(a) Section 201 of E.O. 12919 (59 FR 29525) delegates the President's authority under section 101 of the Defense Production Act to require acceptance and priority performance of contracts and orders (other than contracts of employment) to promote the national defense over performance of any other contracts or orders, and to allocate materials, services, and facilities as deemed necessary or appropriate to promote the national defense to:
(5) The Secretary of Defense with respect to water resources; and
(b) Section 202 of E.O. 12919 states that the priorities and allocations authority delegated in section 201 of this order may be used only to support programs that have been determined in writing as necessary or appropriate to promote the national defense:
(1) By the Secretary of Defense with respect to military production and construction, military assistance to foreign nations, stockpiling, outer space, and directly related activities;
(3) By the Secretary of Homeland Security with respect to essential civilian needs supporting national defense, including civil defense and continuity of government and directly related activities.