As everyone else have already mentioned, scores aren't everything. But you might need higher scores to get into places like Columbia.
I suggest you to focus on parts of your application that you have control over - mainly your PS.
If your LORs are positive+not generic and you write a PS that speaks of your passion for public health and epidemiology, considering your scores and GPA I think you have a shot at CUNY, and definitely NYMC where they don't even require GRE scores. You can try Drexel, ETSU, and Tulane too because I have similar scores to you (but yours are better!) and I got acceptances into their Epi programs. I had average scores in UG and a below average gre score, but I think my PS is what helped me compensate those.
And since you have working experience as a RA it is a huge positive factor in your profile, especially for epi programs.
I think it is very important to know why you want to pursue a particular specialisation just as much as why you are interested in public health. So if you can write a PS in a compeling story style format explaining your interests then you are good to go.
You can of course always retake GRE (there is plenty of time to retake assuming that you plan on applying in the next cycle).
Otherwise, work on your PS. Feel free to PM me if you want any assistance with your PS.