If you ever allow users to write their own queries, you would definitely want to store the password data in an encrypted form. Better yet, you might consider storing the site specific (system) data in one database, and the application (user) data in a different database.
If you have any HIPPA protected data for your EMTs, that needs special security. If you have any Sarbanes-Oxley protected data (probably for budgeting and related activities), that needs special security too.
The business of deciding what needs to be protected, and how that protection needs to be done is a complex bag of worms. You probably want to talk to somebody in the governmental group that provides funding/oversight to get some guidance from them on these issues.
-PatP