The current Aquifer Atlas is the 2015 edition. Prior editions can be found in the right side column on this page. The 2015 Aquifer Atlas can also be found in a Flip Book version on a website jointly managed by the agencies that participated in the atlas creation.
Area agencies in Idaho and Washington have begun work on a new edition to be completed by 2022 year-end. It will contain much of the same historical information but will be updated to reflect current issues, population changes and water use data.
Note that the 2015 edition is still very useful and packed with relevant information. Enjoy!