I recommend  you take a look at what the state and federal agencies are paying in your state/area for the level of work you perform, for starters.

If you are near the college you attended, they may give you additional information. There is also salary.com, though I've never used it.  I am in a different field, but I have a professional organization and they publish salary survey info about once every couple of years.

You don't indicate how long you've been in the field, and whether you have any advanced education or certificates.  Each of those might buy you a higher salary.