40 C.F.R. § 35.2109

The Regional Administrator may award a Step 2 + 3 grant which will provide the Federal share of an allowance under appendix B and the estimated allowable cost of the project only if:

(a) The population of the applicant municipality is 25,000 or less according to the most recent U.S. Census;

(b) The total Step 3 building cost is estimated to be $8 million or less; and

(c) The project is not for a treatment works phase or segment.