I'd like to uninstall postgres on Mac OS 10.6 and start again with a completely fresh installation and empty databases. 

I've killed all running postgres processes and tried to delete the postgres data directory, but no joy (see below): six databases are still there. 

I've also tried to find the PGDATA variable, but it seems to be blank. Where are these databases living?

```
delirium:~ ap257$ kill 7495
delirium:~ ap257$ sudo su - postgres
Password:
delirium:~ postgres$ rm -rf /usr/local/pgsql/

```

[reinstall postgres from binaries]

```
delirium:~ ap257$ sudo su - postgres
Password:
delirium:~ postgres$ export PATH=$PATH:/usr/local/pgsql/bin/
delirium:~ postgres$ psql
Password: 
psql (8.4.4)
Type "help" for help.
postgres=# \l
                                 List of databases
       Name       |  Owner   | Encoding | Collation | Ctype |   Access privileges   
------------------+----------+----------+-----------+-------+-----------------------
 osqa             | postgres | UTF8     | C         | C     | =Tc/postgres
                                                            : postgres=CTc/postgres
                                                            : osqa=CTc/postgres
 postgres         | postgres | UTF8     | C         | C     | 
 production       | postgres | UTF8     | C         | C     | =Tc/postgres
                                                            : postgres=CTc/postgres
                                                            : anna=CTc/postgres
 template0        | postgres | UTF8     | C         | C     | =c/postgres
                                                            : postgres=CTc/postgres
 template1        | postgres | UTF8     | C         | C     | =c/postgres
                                                            : postgres=CTc/postgres
 template_postgis | postgres | UTF8     | C         | C     | 
(6 rows)
postgres=# \q
delirium:~ postgres$ echo $PGDATA

```

Why won't these databases die?