This blog post has helped me clean up my postgres development environment on Mac. So making a copy!
How completely uninstall PostgreSQL 9.X on Mac OSX This article is referenced from stackoverflow: If installed PostgreSQL with homebrew , enter brew uninstall postgresql If you used the EnterpriseDB installer , follow the following step. Run the uninstaller on terminal window sudo /Library/PostgreSQL/9.X/uninstall-postgresql.app/Contents/MacOS/installbuilder.sh If installed with Postgres Installer, do: open /Library/PostgreSQL/9.X/uninstall-postgresql.app Remove the PostgreSQL and data folders. The Wizard will notify you that these were not removed. sudo rm -rf /Library/PostgreSQL Remove the ini file: sudo rm /etc/postgres-reg.ini Remove the PostgreSQL user using System Preferences -> Users & Groups. Unlock the settings panel by clicking on the padlock and entering your password. Select the PostgreSQL user and click on the minus button. Restore your shared memory settings: sudo rm /etc/sysctl.conf