If your site has jurisdictional wetlands and you plan to fill, excavate or build in them, you need authorization before work starts. In most of the United States that means a Section 404 permit from the U.S. Army Corps of Engineers (USACE), often alongside a state or local approval. The process runs in a fixed order: confirm what is on the site, avoid and minimize impacts, apply, wait for review, then mitigate whatever you cannot avoid. Done early, it is a manageable line item. Done late, it is the reason closings slip and site plans get redrawn.
TL;DR
- Start with a delineation and a jurisdictional question: you cannot design an application until you know what is regulated and where its boundary sits.
- Most projects land under either a nationwide (general) permit or an individual permit. The category depends on the activity and the size of the impact.
- Plan for a routine application with public notice to take at least three months. Large or complex projects take longer.
- State and local rules can apply even where federal jurisdiction does not, so check both before you buy or design.
- Avoidance and minimization come first. Compensatory mitigation is for the impacts that remain.
Table of Contents
- Who regulates wetlands: federal, state and local layers
- What activities need a wetlands permit
- The wetlands permit process, step by step
- Nationwide permits versus individual permits
- How long the process takes
- Compensatory mitigation: when it applies and what forms it takes
- Wetlands due diligence before you buy, sell or design
- Our perspective
- Get the wetland question answered before the land deal gets expensive
- Common mistakes that slow wetland permits
- FAQ
- Sources
Who regulates wetlands: federal, state and local layers
Section 404 of the Clean Water Act requires a permit for placing fill or excavating in jurisdictional waters, including wetlands. USACE implements the program day to day in most states. EPA's January 2025 guide notes that only Michigan and New Jersey have assumed the program under Section 404(g).
The Corps is not the only federal agency involved. USGS identifies five federal agencies with primary wetland-protection duties: the Corps, EPA, the Fish and Wildlife Service, NOAA and NRCS. In practice the Fish and Wildlife Service or state agencies may comment on your application, and endangered species or historic resource reviews can run alongside it.
State programs add another layer. The National Agricultural Law Center explains that the 2023 Sackett decision narrowed federal Clean Water Act wetland jurisdiction but did not remove independent state authority. State programs vary and may protect waters beyond the federal baseline. Counties and cities may also regulate buffers, stormwater and floodplain work through their own ordinances.
What Sackett changed
In Sackett v. EPA, the Supreme Court held that a wetland falls under the Clean Water Act only if it is connected to a relatively permanent water that is itself a water of the United States, with a continuous surface connection that leaves no clear line between water and wetland. For landowners, this means some isolated wetlands that once needed a federal permit may no longer need one. It does not mean they are unregulated. A state or local permit may still be required, and the determination is made site by site.
What activities need a wetlands permit
The 2022 USACE applicant guide lists regulated activities in jurisdictional waters, including construction of structures, excavation, dredging, and filling or depositing dredged or fill material. It also covers utility lines, cables and pipes, and shoreline structures such as breakwaters, jetties, groins and revetments.
For a land developer, the common triggers are predictable:
- Grading and fill for a building pad, parking or truck court
- Road and driveway crossings of streams or wetland fingers
- Utility corridors, including sewer, water and storm lines
- Detention ponds or outfalls placed in or next to wetlands
- Industrial outdoor storage yards that need a large, level, stabilized surface
The last item matters for teams evaluating industrial outdoor storage sites. These projects need a lot of flat, usable acreage, so even a small wetland pocket in the wrong spot can shape the layout.
The wetlands permit process, step by step
The Corps' own permit application instructions describe the core sequence. Here it is in the order a development team experiences it.
01 Consult the Corps district and state agency early
USACE recommends contacting the district office early and notes that complex projects benefit from pre-application consultation. Bring a site map, a rough project description and any known constraints. Ask which permit pathway is likely, which state approvals run in parallel and what the district will want in the file.
02 Delineate the aquatic resources
A delineation maps potentially regulated waters and documents the methods used. According to the Corps' Regulatory Request System, the report typically includes maps, datasheets, photographs and figures. A qualified wetland consultant usually performs the fieldwork. Seasonal conditions matter, since vegetation and hydrology indicators are easier to document in the growing season. See our guide to the wetland delineation process for developers and landowners for what to expect on site.
03 Resolve jurisdiction
A jurisdictional determination (JD) is optional. The Corps states that a JD is not required to apply, and that jurisdictional questions can be raised in the application cover letter. There are two types:
| Approved JD | Preliminary JD | |
|---|---|---|
| What it does | Identifies aquatic-resource boundaries and whether they are jurisdictional | Presumes that aquatic resources on the site are jurisdictional |
| Duration | Valid for five years | No expiration date |
| Best when | You want a firm answer, for example to support a sale or to show that part of a site is outside federal jurisdiction | You want to move fast and are willing to treat the features as regulated |
04 Design to avoid and minimize
This is where the project is won or lost. The Corps expects applicants to show that impacts were avoided where practicable and minimized where they could not be. Shifting a building footprint, narrowing a road crossing, or choosing a different stormwater layout costs far less on paper than after plans are final.
05 Prepare the application package
A complete package typically includes:
- The application form and project description
- Site and vicinity maps
- Engineering drawings showing existing conditions and proposed work
- The delineation report
- Impact calculations by wetland or stream feature
- An alternatives analysis, for individual permits
- A mitigation proposal for unavoidable impacts
- Any jurisdictional information the district requests
Whatever the agency, a reviewer's first job is checking that the permit application documents give enough information to decide which kind of review is appropriate. Gaps at this stage are the most avoidable source of delay.
06 Submit and respond to completeness review
The district checks whether the application is complete and coordinates with other agencies. Requests for more information stop the clock on your schedule, so answer them promptly and in full.
07 Public notice, where required
Individual permits generally go through public notice, which gives agencies and neighbors a chance to comment. Comments can lead to additional questions or conditions.
08 Decision: issuance, conditions or denial
The Corps issues, conditions or denies the permit. Conditions commonly cover mitigation, construction timing and monitoring. Obtain all required approvals before work begins, not after.
Nationwide permits versus individual permits
The Corps uses two main tools for projects with limited or more significant impacts.
General permits, including nationwide permits. These pre-authorize categories of work with minimal impacts, such as certain utility crossings, road crossings or residential development, if you meet each permit's terms and conditions. Many require a pre-construction notification to the district before you start. Limits, often framed by acreage or linear feet of impact, differ by permit type and are updated when the Corps reissues the nationwide permits, so confirm the current list with your district.
Individual permits. These apply when impacts are potentially significant, when no general permit fits, or when a project exceeds a general permit's limits. They involve a fuller application, an alternatives analysis, public notice and a more detailed review. EPA's description of the regulatory authority frames the split the same way: an individual permit is needed for potentially significant impacts.
In many states, a nationwide permit still needs a state water quality certification or coastal zone consistency review. That step is a common surprise for first-time applicants, and it runs on the state's schedule.
How long the process takes
The 2022 USACE applicant guide states that a routine application involving public notice normally takes at least three months. Large or complex activities may take longer because of site visits, federal, state and local coordination, and data analysis. The guide adds that early contact and pre-application consultation may help prevent delays.
That is the agency's benchmark, not a guarantee. Build your own schedule from the front end:
| Phase | What drives the time |
|---|---|
| Delineation and survey | Season, site access, size of the property, survey of flagged boundaries |
| Design to avoid and minimize | Number of iterations between civil engineer, planner and owner |
| Application preparation | Alternatives analysis, mitigation plan, impact tables |
| Agency review | Completeness, public notice, species and historic reviews, state certification |
| Mitigation arrangement | Credit availability, or design and approval of a project of your own |
Treat agency review as one phase among several. On many projects the larger schedule risk is the work done before submittal.
Compensatory mitigation: when it applies and what forms it takes
Compensatory mitigation addresses impacts that remain after avoidance and minimization. The Corps' rule at 33 CFR Part 332 recognizes three forms: credits from a mitigation bank, credits from an in-lieu fee program, and permittee-responsible mitigation, where you implement the project yourself.
The rule describes how each works. If impacts fall within the service area of an approved in-lieu fee program and the sponsor has the right type and number of credits, you may meet the requirement by securing those credits. The same logic applies to approved mitigation banks. Where no suitable credits are available, permittee-responsible mitigation is the remaining route. The district decides what is appropriate for your project and sets the requirement as a permit condition.
For planning purposes, ask three questions early:
- Is there an approved bank or in-lieu fee program whose service area covers the site?
- Do credits of the right resource type exist today?
- If not, is there land on or near the project that could support a mitigation project of your own?
The answers affect cost and timing, so they belong in the feasibility analysis rather than in the permit application stage.
Wetlands due diligence before you buy, sell or design
The cheapest time to learn about a wetland is before the contract is firm. A short checklist for landowners, investors and builders:
- Review existing records. National Wetlands Inventory maps, soil surveys, floodplain maps and prior surveys give early clues. They are screening tools, not determinations.
- Order a delineation or a Phase 2 wetland scope if desktop review shows a likely feature. Our Phase 2 wetland delineations service is built for this stage.
- Overlay the features on the concept plan. Measure what the layout affects, in acres and linear feet, so you can judge which permit path is likely.
- Check state and local buffers. Setbacks can reduce usable land even where there is no federal permit. For one example, see our article on North Carolina riparian buffers and the 50 foot rules.
- Order a topographic and existing conditions survey so drainage, flagged boundaries and elevations sit on one base map. Our topographic and existing conditions survey page explains the deliverables.
- Confirm geotechnical conditions. Soft or saturated soils often point to wetland edges and affect foundation cost. See the geotechnical report requirements for U.S. developers.
- Put permit time into the capital schedule. Carrying costs on land during agency review are real, and a purchase contract with a due diligence period should leave room for the delineation.
Our perspective
Most wetland problems we see are not permitting problems. They are sequencing problems. A buyer closes, then orders a delineation, then learns that a wetland finger runs through the best part of the site. By then the options are narrower and more expensive.
Our approach is to move the wetland question to the front of the feasibility study. We review the property documents, zoning constraints and market direction together, then test how a delineated boundary changes the layout, the infrastructure plan and the likely permit path. That lets an owner decide whether to buy, sell, redesign or proceed with eyes open.
We also coordinate the survey and engineering work so the delineation, topography and civil design agree with each other before an application is filed. A consistent package is easier for a reviewer to evaluate and easier for an owner to defend. Our aim is to catch issues before they become costly mistakes.
Jeremy Wenger
Get the wetland question answered before the land deal gets expensive
Urban Planning Pros helps landowners, developers, builders and investors evaluate property documents, zoning, infrastructure and site constraints before they commit capital. If wetlands may affect your site, a feasibility study is the right place to start, with delineation, survey and engineering coordination tied to the concept plan.
Explore our feasibility and development services, or learn how master land planning turns the constraints into a workable layout. Book a Feasibility Call to discuss your site.
Common mistakes that slow wetland permits
- Filing before the layout is stable. Changing the site plan after submittal can force revised impact tables and new agency review.
- Under-describing the project. Utilities, stormwater outfalls and temporary construction access count as impacts. Our piece on how to sequence wet and dry utilities helps avoid rework that touches regulated areas.
- Skipping pre-application contact. The Corps recommends early consultation for complex projects, and it costs little.
- Treating state review as an afterthought. Certification and state permits can run on separate clocks.
- Leaving mitigation to the end. Credit availability and cost can change a project's economics.
FAQ
Do I need a jurisdictional determination to apply for a wetlands permit?
No. The Corps states that a jurisdictional determination is not required to apply, and jurisdictional questions can be raised in the application cover letter. An approved JD is valid for five years, while a preliminary JD presumes jurisdiction and has no expiration date. Many owners choose an approved JD when they need certainty for a sale or financing.
How long does a wetlands permit take?
USACE says a routine application with public notice normally takes at least three months, and large or complex activities can take longer. Your total timeline also includes delineation, design and any state approvals. Contact the district early to get a realistic read for your project.
Does the Sackett decision mean I no longer need a wetland permit?
Not necessarily. The decision narrowed federal Clean Water Act jurisdiction over wetlands, but state programs operate independently and may protect more than the federal baseline. Local buffer rules can also apply. A delineation and a check of state and local requirements will tell you where your site stands.
What is the difference between a nationwide permit and an individual permit?
A nationwide permit authorizes a category of work with minimal impacts if you meet its conditions, and some require advance notice to the Corps. An individual permit is for potentially significant impacts or work that does not fit a general permit, and it involves a fuller review with an alternatives analysis. Your Corps district can confirm which applies.
When is compensatory mitigation required?
It applies to impacts that remain after you avoid and minimize them, as set by the district in the permit. It can take the form of mitigation bank credits, in-lieu fee program credits or a permittee-responsible project under 33 CFR Part 332. Check early whether credits exist in your project's service area.
Sources
- Regulatory Request System: Jurisdiction
- USACE: Instructions for Permit Application
- USACE Regulatory Program Applicant Information Guide, 2022
- EPA: Federal Permitting and Environmental Reviews, January 2025
- USGS: Wetland Protection Legislation
- National Agricultural Law Center: Wetlands Permitting Statutes
- Sackett v. EPA, 598 U.S. (2023)
- 33 CFR Part 332: Compensatory Mitigation for Losses of Aquatic Resources
- EPA: Wetland Regulatory Authority