Tuzz - I didn't want to ignore your question. But, NY, NJ & CA are three states that are considerably "different" in respect to pesticide treatment options - no offense intended. In order for YOU to remain legal and compliant with local laws, it would be best to seek treatment suggestions from sources within your state.
On another issue: The fireants in your area are probably European Fire Ants, and are different from the Red Imported Fire Ants found in the South. I'm not certain if the same control measures work comparably for both species.
Here's some good info on the Red Imported Fire Ant - pay note to Q&A #8:
