What is a mitigation bank?

When a project — a road, a subdivision, a pipeline — unavoidably impacts a regulated resource like a wetland or stream, federal and state law require the developer to compensate for that loss. One of the most common ways to do that is to buy mitigation credits from a mitigation bank.

A mitigation bank is a site where a sponsor restores, establishes, enhances, or preserves a natural resource — a wetland complex, a stream reach, a riparian buffer — under a formal agreement with regulators. In exchange for that ecological lift, the bank is awarded a number of credits it can sell.

Credits, releases, and ledgers

Credits aren't all available on day one. A bank earns the right to sell them over time as it hits ecological performance milestones — this is the credit release schedule. Each release, and each sale (a withdrawal), is recorded in the bank's ledger. The running balance of released-but-unsold credits is what's available to buy.

That's why "how many credits exist" and "how many you can actually buy this quarter" are different numbers — and why tracking releases and withdrawals over time tells you whether a local market is tightening or loosening.

Service areas: geography comes first

A bank can generally only sell to impacts within its service area — usually defined by watershed (a Hydrologic Unit Code, or HUC). The idea is that compensation should happen in roughly the same watershed as the impact. So the first question for any buyer isn't "who has credits" — it's "who has credits and can service my location."

Where the data lives: RIBITS and the states

Federally, mitigation banks are tracked in RIBITS (Regulatory In-lieu fee and Bank Information Tracking System), run by the U.S. Army Corps of Engineers. Some states run their own programs on top of the federal framework — North Carolina, for example, administers riparian buffer and nutrient (nitrogen and phosphorus) credits through NC DEQ. MitigationDesk unifies both.