The intervention group will receive facilitated engagement with Chart. Chart is an online decision support platform designed to support evidence-based climate change adaptation. Chart has a risk assessment platform that provides estimates of heat-health risks at a census tract level under various hazard conditions. It also has a decision support platform that links drivers of risk in a given location with information about potential risk reduction activities and includes information useful to policymakers regarding intervention efficacy, timing, and cost. Facilitated engagement includes an initial introduction to the platform, real-time questions and answers, and focused discussion regarding priority interventions and planning and implementation needs. This engagement comprises about five hours of time that can be provided over the course of a couple weeks or several months, depending on the needs of the health department.

Study participants in the control group will be provided with a package of information supportive of heat-health vulnerability and risk assessment and planning for risk reduction activities through built environment hazard mitigation and public health programming. This package will include an annotated list of online resources, including those available on Heat.gov and the CDC website, and a selected set of review papers on heat-health vulnerability, heat-health risk assessment, heat hazard mitigation through built environment strategies, and heat action planning and preparedness.

The intervention group will receive facilitated engagement with Chart. Chart is an online decision support platform designed to support evidence-based risk assessment and planning for extreme heat risk mitigation. Chart has a risk assessment platform that provides estimates of heat-health risks at a census tract level under various hazard conditions. It also has a decision support platform that links drivers of risk in a given location with information about potential risk reduction activities and includes information useful to policymakers regarding intervention efficacy, timing, and cost. Facilitated engagement includes an initial introduction to the platform, real-time questions and answers, and focused discussion regarding priority interventions and planning and implementation needs. This engagement comprises about five hours of time that can be provided over the course of a couple weeks or several months, depending on the needs of the health department.

All departments will undertake the pre-intervention baseline assessment. The baseline assessment will gather information related to organizational demographics and demographics of the communities that the organization serves.

All departments will undertake the pre-intervention baseline assessment. The baseline assessment will gather information related to the organization's current activities relevant to extreme heat, including surveillance and program evaluation activities.

All departments will undertake the pre-intervention baseline assessment. The baseline assessment will gather information related to contextual and organizational factors that may affect intervention implementation.

Meaningful changes in the demographics of the organization or service area.

The the post-intervention assessment will query participants regarding meaningful changes in the organization's activities and profile (e.g., the occurrence of a regional disaster that disrupted service provision across the organization).

Barriers and facilitators of Chart implementation and implementation outcomes using linkages to theoretical frameworks. Investigators will conduct key informant interviews (KIIs) with all 15 of the primary site contacts for the sites randomized to the intervention group. In this case, investigators will reference the Consolidated Framework for Implementation Research (CFIR) as a source of constructs to measure factors affecting Chart's implementation.