From the Webpage: "The National Household Survey (NHS) tracks progress in personal disaster preparedness through investigation of the American public's preparedness actions, attitudes, and motivations. FEMA administers the survey in English and Spanish via landline and mobile telephone to a random sampling of approximately 5,000 adult respondents. The survey includes a nationally representative sample as well hazard-specific oversamples which may include earthquake, flood, wildfire, hurricane, winter storm, extreme heat, tornado, and urban event. FEMA delays publishing the data until approximately the release of the summary results for the subsequent NHS iteration. For example, FEMA published the 2017 data package at approximately the same time as the publication of the 2018 NHS Summary."
Federal Emergency Management Agency: http://www.fema.gov/