This toolkit was created to facilitate the use of the US EPA Citizen Science Quality Assurance Handbook and support collaboration between citizen science groups and federal, state, Tribal, and local agencies to produce data that can be used to answer important environmental and public health questions. Citizen science group resources include an 18-minute video series, two fact sheets, and a webinar. Government agency resources are an orientation guide and a webinar. US EPA Citizen Science Quality Assurance Handbook: https://www.epa.gov/citizen-science Citizen Science Quality Assurance Toolkit: https://www.aphl.org/cit-sci