Pretty sure the labor certification and prevailing wage requirement is on a county / city basis (i.e. somewhat related to the actual local wages), see also https://www.dol.gov/whd/immigration/h1b.htm
Hope it isn't based on what the government pays developers. I've seen some java devs making upper 30s to low 40s within the past few years. That's just crazy.
Last time I worked with a government department here the entire IT/development team were the local equivalent of H1Bs