From the "Safe Harbor Compliance is Coming Soon" section: Heroku is not yet a registered participant in the Safe Harbor program. We’ve laid the groundw

From the "Safe Harbor Compliance is Coming Soon" section: Heroku is not yet a registered participant in the Safe Harbor program. We’ve laid the groundwork for becoming Safe Harbor certified and expect to have it soon. The Europe region public beta is designed to let you build high-performance apps for European users. It does not currently address data residency or jurisdiction concerns. You should assume that some portions of your app and its data will be in, or pass through, datacenters located in the US.