National Association of County & City Health Officials (NACCHO) Local Health Department (LHD) Directory by zip code.
Nature of Evidence
Internet-accessible book by the National Academies Press titled Environmental Health Sciences Decision-Making: Risk Management, Evidence and Ethics: A Workshop Summary (2009) provides a good summary on the strategies used to make decisions including defining the 'nature of evidence' and measures of evidence credibility. Table of contents and chapters accessible by links to the right of the text.
Analytic-Deliberative Process
Internet-accessible book by the National Academies Press titled Understanding Risk: Informing Decisions in a Democratic Society provides a good summary (pages 6-8) on the structuring of an effective analytic-deliberative process for informing a risk decision.