Is this "Notice" valid, even though the work (labor install and equipment) have been completed for more than 6 months?

I just closed on my new construction house on 2/21/13. A "Notice of Contract" was filed on 3/14/13 against me and the builder/contractor by a sub-contractor (water filtration company). The house delivery date was over 7 months late (this nightmare is a long story), and it seems the builder/contractor did not pay all of his subs, but told them he would upon the closing. I have not received any written notice, nor have I ever been called/contacted by the water filtration company, but have been keeping an eye on the public record. I had read (but could have misinterpreted) that it needs to be filed within 90 of the work being completed. I don't know what to do, and cannot afford an attorney right now since I just closed on the home. I do know that this also has happened to the other house on my street (notice filed at same time) that was completed a few weeks prior to mine. Do I have recourse? Please advise me as where to turn, or whom to speak with. Thank you very much.