"Section 1413 of the Safe Drinking Water Act provides for a State to have primary enforcement responsibility for public water systems if EPA determines that the State has satisfied 5 basic conditions specified in Section 1413. One of the conditions (Sec. 1413(a)(5)) requires that a State, "Has adopted and can implement an adequate plan for the provision of drinking water under emergency circumstances." A State is not required to have an individual plan for each public water system. All that is required is a State-wide plan for responding to emergencies. A State must submit to EPA, pursuant to 40 CFR 142.11(a)(5), a brief description of its plan. The adequacy of the plan should be determined on the basis of this submission. This guidance is limited to those key elements of a State-wide plan that will permit a timely, effective response to problems. Within this general framework, it is suggested that the States be permitted maximum discretion in adopting and implementing a plan. Any requirements imposed on the States should be simple and relatively limited so that they can be readily and usefully attained. To be realistic, the State plan should have clear but limited objectives and should be periodically updated and tested."
U.S. Environmental Protection Agency: http://www.epa.gov/