The purpose of this handbook is to explain the US Environmental Protection Agencys (EPAs) Public Notification (PN) Rule and provide examples of effective public notices. This handbook is designed to meet the needs of public water systems (PWSs) of all sizes, including suggestions and instructions targeted to very small community systems (systems that serve 500 people or fewer). Suggestions, along with other useful hints for creating effective notices for all systems, are set aside in boxes throughout the handbook. This version of the handbook updates the March 2007 version (EPA 816-R-07-003). It reflects necessary changes in light of recent EPA regulations, including the Ground Water Rule (GWR) and other rule-related updates. New templates for some violations and situations of these rules are included.