If i got one hepatitis a vaccination 3 years ago, what is my current level of immunity?

Incomplete: To get lifelong immunity from vaccination, you are supposed to have a second vaccine within 6 - 12 months from the first. There is research to support that if you get your 2nd dose within 5 1/2 years (and maybe longer) you should not need any further vaccines however. See http://www.Nlm.Nih.Gov/medlineplus/ency/article/003684.Htm.

Varies: Varies from person to person.Only bloodwork would accurately measure, but probably low.