Can I Purchase MMWA Wetland Mitigation Bank Credits Now, Even Though I Don’t Have a Permit Requiring Mitigation Yet? michiganwetlands@michigancreative June 12, 2017agricultural producers, agricultural producers with swampbuster violations, landowners with expiring crp contracts, local governments Possibly. The MMWA Board will take requests for credits and make decisions on a case-by-case basis.