Wetland Mitigation Isn't Pay-to-Impact: The Avoid-Minimize-Mitigate Sequence
Updated: Oct 27
Something we hear often from those in need of a wetland permit is: "Can't we just buy mitigation credits and fill it in?"
We also hear a fair question from people who haven’t been through the wetland permitting process: “Are mitigation credits like carbon credits? Isn’t that just paying someone to destroy wetlands?"
While we take no position on carbon credits, this comparison is understandable. Both involve a market, a credit, and a ledger. However, the comparison between wetland mitigation banking and other offset markets breaks down quickly when you examine the regulatory framework for wetland mitigation.
If there's one thing to take away from this post, it's this:
Mitigation isn’t a bypass around the wetland avoidance requirement. It’s the last step in the wetland regulatory sequence.
Under both federal and Florida rules, wetland mitigation is not a purchase made in place of regulatory requirements or a design decision. The sequence is: 1) avoid wetlands, then 2) minimize the wetland impacts, and finally, 3) mitigate the remaining unavoidable wetland impacts. Federal rules bar a permit when a practicable alternative with less impact exists, and Florida requires practicable design changes to reduce or eliminate impacts. And when an applicant does buy bank credits, the money goes to the bank that did the restoration work, not to the regulator.
The Short Answer on Wetland Mitigation Credits
Wetland mitigation only offsets impacts that remain after the project has been designed (and often redesigned) to avoid wetlands where practicable and to shrink the impacts that can’t be avoided for project feasibility, local zoning requirements, or other reasons. The federal Section 404 program and Florida's Environmental Resource Permit (ERP) program both require the applicant to document avoidance and minimization measures before compensatory mitigation is considered or approved. Credits are only accepted for unavoidable impacts; they don’t replace regulatory design review.
From the environmental consulting side, much of our effort is spent working with the applicant and their civil engineering and design teams to iterate through the following process:
Avoidance: Can we keep the footprint out of wetlands and other surface waters where a practicable alternative exists?
Minimization: Can we reduce the size, severity, or duration of the impacts that can't be avoided?
Mitigation: How can we offset the remaining, unavoidable impacts with restoration, enhancement, creation, preservation, or bank credits that are commensurate with the functional loss?
Federal: The Section 404(b)(1) Guidelines
For fill in waters of the United States, the controlling test is EPA's Section 404(b)(1) Guidelines at 40 CFR 230.10. It contains no mitigation option in its first paragraph, and in fact it actually contains a prohibition.
Avoidance is a Regulatory Standard
Under 40 CFR 230.10(a), no discharge of dredged or fill material may be permitted if a practicable alternative exists that would have less adverse impact on the aquatic ecosystem. "Practicable" means available and capable of being done after considering cost, existing technology, and logistics in light of overall project purposes. An alternative can also include land the applicant doesn't own yet, if it could reasonably be obtained. The output of this analysis is the Least Environmentally Damaging Practicable Alternative (the “LEDPA”). The Corps can only authorize that alternative.
The Burden is Heavier for Wetlands
Wetlands are classified as "special aquatic sites" by EPA. Under 40 CFR 230.10(a)(3), when a project doesn't need to be in the wetland to achieve its basic purpose (e.g., a subdivision, an office complex, an industrial center), the rule presumes an upland alternative is available unless the applicant clearly demonstrates otherwise. Very little commercial development in Florida is water dependent, so most of the applicants we work with start out having to show that no practicable alternative, on-site or elsewhere, would have less impact on the aquatic ecosystem.
Minimization is a Separate Requirement
Under 40 CFR 230.10(d), no discharge may be permitted unless appropriate and practicable steps have been taken to minimize its adverse impacts. Picking the LEDPA doesn’t satisfy the requirement on its own. The chosen layout still has to demonstrate sufficient minimization of wetland impacts.
Mitigation is Written into Regulation as the Last Step
The 2008 Compensatory Mitigation Rule (33 CFR Part 332, published at 73 FR 19670) specifically spells out this order. 33 CFR 332.1(c) states that an individual permit is issued only after a finding that the applicant has taken all appropriate and practicable steps to avoid and minimize. Compensatory mitigation applies to unavoidable impacts. The same paragraph allows the district engineer to deny a permit outright where no appropriate and practicable mitigation is available.
Florida: "Elimination and Reduction" in the ERP
Florida runs its own test through the Environmental Resource Permit program under Chapter 62-330, F.A.C., and ERP Applicant's Handbook Volume I, which is incorporated into that rule. Florida calls avoidance and minimization "elimination and reduction", but the order and intent are the same.
The Application Asks for It First
Florida’s ERP application (Form 62-330.060(1), Section C) asks applicants to describe how they eliminated or reduced wetland impacts, citing Handbook Section 10.2.1, before it asks for a mitigation plan. Avoidance and minimization come first in Part 2, and the mitigation plan comes several items later. The Standard is Practicable Design Modification
FDEP Handbook Section 10.2.1.1 directs the agency to consider whether the applicant has implemented practicable design modifications to reduce or eliminate adverse impacts. The rule also sets a limit: a modification does not mean abandoning the project, and the agency cannot require a project that is significantly different in type or function.
A Narrow Exception
Under Section 10.2.1.2, the agency will not require design modifications where the wetland to be impacted has low ecological value, based on a site-specific analysis, and the proposed mitigation will provide greater long-term ecological value. That exception still runs through a functional assessment. This is not a purchase option and it doesn’t apply to a wetland that is functioning well based on the Handbook’s factors: condition, hydrologic connection, uniqueness, location, and fish and wildlife use.
A Recent Florida Case Study
One recent illustrative case is DuFour v. DEP (DOAH No. 25-0050; DEP Final Order 24-2935), in which a homeowner on Big Pine Key applied in January 2024 to fill wetlands for flood control. The ERP application offered mitigation from the start, through purchase of credits from FPL's Everglades Mitigation Bank. FDEP denied it in October 2024, and the first stated reason was that practicable modifications had not been made to reduce or eliminate wetland impacts. Over several rounds of revisions, the avoided wetland area grew from 830 to 1,606 square feet, with zero mangrove impacts. The Administrative Law Judge (ALJ) found the final design met Section 10.2.1.1 and that the impacted saltmarsh was low in ecological value under Section 10.2.1.2, and DEP issued the permit by final order in August 2025, about 19 months after the application. The required mitigation was 0.04280 credits, scored with W.A.T.E.R. (the assessment method FDEP uses in the Keys instead of UMAM). So just because credits are available and an applicant is willing to pay, doesn't mean the application gets a rubber-stamped approval.
Who Issues the Federal Wetland Permit in Florida Right Now
Florida assumed Section 404 permitting in December 2020. A federal district court vacated that approval in February 2024, and 404 permitting returned to the Corps. The D.C. Circuit affirmed the vacatur in March 2026. The federal agencies and Florida petitioned for rehearing on August 7, 2026 (Florida Specifier). The D.C. Circuit denied the federal government’s petition for en banc rehearing in October 2026. For now, Florida projects that fill federally jurisdictional wetlands have to clear two separate avoidance and minimization reviews: one by the Water Management District or DEP for the ERP, and one by the Corps for Section 404.
Why a Mitigation Credit is Not Like a Carbon Credit
The common skepticism about wetland mitigation credits tends to turn on a few questions: Was it optional? Is the benefit real? Is it in the right place? Was it verified before it was sold? Each of these questions has answers in-rule.
Common Questions About Wetland Mitigation Credits: | How Florida and Federal Wetland Rules Answer: |
Can you just buy more credits instead of changing the project? | No. Avoidance and minimization are permit conditions under 40 CFR 230.10(a) and (d), and ERP Handbook 10.2.1. Mitigation addresses only unavoidable impacts (33 CFR 332.1(c)). |
Is the credit tied to a real, measured wetland functional gain? | Bank credits are awarded on the degree of ecological improvement, measured with a functional assessment method (373.4136(4), F.S.). In Florida, that method is generally UMAM, which scores both the impact site's loss and the bank's gain. |
Does the wetland credit offset the same kind of resource nearby? | Credits may be used only within the bank's mitigation service area, which follows regional watersheds (373.4136(6)). Out-of-area use is allowed only after a documented credit shortage, with multipliers: +1.2 for the adjacent watershed, +0.25 per additional watershed crossed, +0.5 if out-of-kind. |
Is a wetland credit sold before the work is done? | Credit releases at a wetland mitigation bank are tied to milestones: 30% at conservation easement and financial assurance, 30% after initial construction, 20% as interim performance criteria are met, and 20% at final success (s. 373.4136(5)). This default applies to bank permits issued since July 1, 2025; preservation-only areas release 100% at recordation, and older banks follow the schedule in their permits. |
Who and what keeps a wetland mitigation bank functioning? | The bank must be managed in perpetuity, with financial assurances (e.g., bonds, escrows, trusts, or other financial mechanisms) and a recorded conservation easement (373.4136(1) F.S.). |
The functional assessment cuts both ways. UMAM scores the impact site on location and landscape support, water environment, and community structure, then adjusts the mitigation for time lag and risk. A high-functioning cypress strand, for instance, costs more credits per acre than a ditch-side pasture wetland full of torpedograss or non-native primrosewillow. Because higher-functioning wetlands require more credits to offset, the mitigation cost end up being a practical guide for determining which wetlands are worth designing around first.
What Florida's 2025 Mitigation Banking Law Changed
Florida rewrote parts of its mitigation banking statute in 2025. CS/CS/SB 492 became Chapter 2025-191, Laws of Florida, and took effect July 1, 2025. It made several changes that bear directly on whether credits will be available when a project needs them:
A Default Credit Release Schedule
Before the law, DEP and the Water Management Districts set each bank’s release schedule case by case. Bank permits issued after July 1, 2025 now follow a statutory default: 30% of awarded credits at conservation easement recordation and financial assurance, 30% after initial construction, 20% as interim performance criteria are met, and 20% at final success. Preservation-only areas release 100% at recordation, and freshwater wetland creation credits still wait for the initial construction success criteria. Existing banks can ask to switch to the new schedule if they haven’t yet had construction-stage credits released. More credits reach the market earlier, but the first tranche still requires a recorded easement and posted financial assurance.
A Defined Path When a Basin Runs Short on Credits
Credits are still tied to the bank’s service area. What’s new is a one-time option when the banks serving the impacted watershed don’t have enough credits of the right type. The agency contacts every bank whose service area covers the impact site within 7 business days, the banks get 15 business days to report available credits, and a bank that doesn’t reply is presumed to have none. If a bank in the service area has suitable out-of-kind credits, the agency can require those to be used first. If the shortage is confirmed, the applicant can buy from a bank outside the service area, but only for the shortfall and at a multiplier: 1.0 within the same regional watershed, 1.2 in an adjacent watershed, another 0.25 for each additional watershed boundary crossed, and another 0.5 for out-of-kind credits. The applicant can rely on that determination for six months, for that application only.
The prior statute let three kinds of projects use a bank regardless of service area: projects partly inside the service area, linear projects such as roads and pipelines, and projects with less than one acre of total impact. That list does not appear in the current statute, so those projects now go through the same shortage process as everyone else. Additionally, starting on July 1, 2026, every bank must report its available credits by type each year, and the agencies report to the Legislature each October 1. That gives applicants and consultants a statewide, state-compiled view of where credits are thin.
Many wetland mitigation banks in Florida also hold a federal Mitigation Banking Instrument (MBI) with its own service area and credit release schedule, set by the Corps under 33 CFR 332.8. Out-of-service-area credits accepted for an ERP aren’t automatically accepted for a Section 404 permit, so the federal side also needs to be checked.
Why Do Regulators Favor Credits Over Other Forms of Mitigation?
It may come as a surprise, but federal rules rank the types of compensatory mitigation, and mitigation bank credits are preferred over payment into an In-Lieu Fee (ILF) program, which are in turn preferred over permittee-responsible mitigation (33 CFR 332.3(b)). The reasons go to the heart of the “pay to destroy” concern. A wetland mitigation bank’s restoration work is planned, protected by a conservation easement, and has to be partly built before its first tranche of credits are released, so the ecological gain is in place before most impacts it offsets. Banks also tend to be large contiguous parcels of land, professionally managed, and financially assured in perpetuity, which lowers the risk that the mitigation fails. The ranking is a preference though, not a mandate, so the Corps can approve other options where it’s environmentally preferable.
Florida takes a different approach. State law doesn’t rank mitigation types. It considers mitigation only “if the applicant is unable to otherwise meet the criteria” leaves the choice of mitigation to the applicant, and requires that whatever is proposed “offset the adverse effects” of the project (373.414(1)(b) F.S.). Bank credits are recognized as an appropriate alternative to on-site or other permittee-responsible mitigation, but aren't required as a first choice (373.4135(1) F.S.). What's standardized at the state level is the measurement of function: every option is scored with UMAM, which weighs the functional gain at the mitigation site against the loss at the impact site. Preservation counts only for the protection it adds beyond what would happen without it, scaled by a preservation adjustment factor (62-345.500(3), F.A.C.).
Under either system, the choice of mitigation type comes after avoidance and minimization, not instead of them.
What It Costs to Get It Wrong on Wetland Permitting
The worst outcome on a development project isn't necessarily the credit price. It's the time lost on multiple rounds of Requests for Additional Information (RAIs) that require major site engineering revisions after the pro forma is built and the plan has been priced, financed, and shown to a local planning board. In DuFour, RAIs, a permit denial, and an administrative hearing added up to roughly 19 months on 4,209 square feet of impact. On a commercial site, every revision cycle also reopens stormwater, traffic, and lot yield.
A Few Common Missteps We See:
Committing to a site plan before the wetland boundaries are delineated
No project team wants to go back to the drawing board six months into a site design, but it happens often when the delineation waits until an agency asks for it. A delineation done during due diligence puts the wetland and surface water boundaries on the base map before the layout is drawn, which costs far less than redrafting a plan that has already been priced and financed.
Treating the alternatives analysis as paperwork
For non-water-dependent projects in wetlands, the Corps presumes an upland alternative exists. The applicant has to rebut that with real alternatives. This isn’t a single-page document; it’s a deep analysis that can take real time and effort to put together.
Assuming credits will be available
If the mitigation banks that serve the project’s watershed are short on the right credit type, Florida’s 2025 law now allows a one-time purchase from a bank farther away, but only after the agency confirms the shortage, and at a higher ratio: 1.2 credits per credit owed for the adjacent watershed, with more added for each additional watershed crossed or for a different wetland type. The Corps reviews federal credit use separately. Under 33 CFR 332.1(c)(3), a lack of practicable mitigation can be grounds to deny a federal permit outright.
Leaving buffers out of the yield calculation
The ERP application asks whether a 15-foot minimum, 25-foot average upland buffer is provided next to preserved wetlands. If not, the applicant has to show secondary impacts won't occur or offset them. That buffer is part of minimization and it comes out of developable area.
Leaning on the low-value exception
Section 10.2.1.2 requires a site-specific functional analysis showing low value and a mitigation plan of greater long-term value. A disturbed-looking wetland may still score well on hydrology or landscape position.
Planning for only one jurisdiction
Sometimes a wetland falls outside federal jurisdiction but still requires a state ERP and/or county wetland impact permit. In other cases, the wetlands will be claimed separately by the state and USACE. Waiting until the last minute to establish jurisdiction can lead to major project delays.
Where It Matters Most in Florida
Avoidance and minimization have the biggest effect on project layouts where growth is moving onto low, flat land with a lot of wetlands. By BEBR's 2025 estimates, the fastest-growing counties from 2020 to 2025 were St. Johns (27.4%), Sumter (25.2%), Osceola (24.8%), and Flagler (22.0%), followed by Walton, St. Lucie, Charlotte, Hendry, Nassau, Gulf, Polk, Manatee, and Lake. Closer to our DeLand office, Palm Coast grew 23.6%, Daytona Beach 23.3%, and DeLand 18.6%.
Much of that frontier is pine flatwoods with cypress domes, wet prairie, and headwater swamps: the St. Johns River corridor, the Upper Kissimmee basin in Osceola and Polk, and the Green Swamp in Lake and Polk. On those parcels, the wetland line often determines lot count before the engineer draws a road. Avoidance and minimization are best done there at the concept stage, when a moved pond or a realigned entrance costs a revision instead of a redesign.
The Bottom Line on Wetland Mitigation
Wetland mitigation is not a pay-to-impact program. Federal and Florida rules require avoidance and minimization first and, with narrow exceptions, accept mitigation only for the impacts that remain. Mitigation is measured by functional assessment, and bank credits are limited by watershed, released in stages, and backed by perpetual management. Project teams have their own reasons to avoid wetlands: every impact designed out saves permitting time and mitigation cost. The cheapest wetland impact is still the one that can be avoided at the concept stage. Excelsior delineates wetlands, scores them with UMAM, and can help design teams design a wetland avoidance, minimization, and mitigation strategy before the site plan is locked. If you have a project site with wetlands on it, contact us today at 855-720-2333 or contact@excelsiorflorida.com. __________________________________________________________________________________
Note: This post is general information about permitting requirements, not legal advice. Requirements depend on site conditions and the reviewing agency. Sources
DuFour v. DEP, Final Order OGC 24-2935 / DOAH 25-0050 (FDEP)
Section 373.4136, F.S., Establishment and operation of mitigation banks (Florida Senate, 2026)
Chapter 2025-191, Laws of Florida (CS/CS/SB 492, Mitigation Banks)
Senate Rules Committee bill analysis, CS/CS/SB 492 (April 2025)
Section 373.4136, F.S. (2022 version, before Chapter 2025-191)
DC Circ. Won’t Rehear Ruling Blocking Fla. Wetlands Permits (Law360, Oct. 8, 2026)
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