A jurisdictional determination (JD) is the U.S. Army Corps of Engineers’ finding on whether a water or wetland on a site is a “water of the United States” under the Clean Water Act. It is not a permit. It answers a narrower question: whether Section 404 applies to a given feature. An approved jurisdictional determination (AJD) is the Corps’ binding finding. A preliminary jurisdictional determination (PJD) is a non-binding one.
A delineation maps the wetland line. A JD decides whether that line is federal. People mix the two up, and it costs them time.
Delineation vs JD
A wetland delineation is field work. It uses the Corps’ wetland delineation manual and the regional supplement: hydrology, hydric soils, and hydrophytic plants. The product is a flagged line, a map, acreage, and a report. A JD is a Corps action. The Corps reviews the report, often walks the flags, and issues a finding. The finding can agree with the map, change the map, or decide that some or all of the mapped wetlands are not waters of the United States. A wetland can be non-jurisdictional. After Sackett v. EPA (2023), that is more common than it used to be, especially for isolated depressions and wetlands cut off from a relatively permanent water. A water can also be in Section 404 without being a three-parameter wetland, such as a relatively permanent tributary or a tidal creek. The delineation and the JD answer different questions. Cypress’s service page for the field work is wetland delineation. This page covers the Corps finding that usually follows it.Approved vs preliminary JD
The Corps uses two common products.Approved JD (AJD) – I may build later, or may sell, or just want the line locked nad made formal
An AJD is a written, official determination of what is and is not jurisdictional on a parcel, including the limits of jurisdictional waters. It is the document lenders, buyers, and permit reviewers usually want when the question is whether Section 404 applies to a feature. Under Corps policy (Regulatory Guidance Letter 05-02), an AJD is generally valid for five years, unless new information warrants a revision earlier. An AJD is also an action the landowner can appeal through the Corps’ administrative appeal process.Preliminary JD (PJD) – I’m ready to build
With a PJD, you treat the identified aquatic resources on the site as if they were jurisdictional so that a permit can move forward. It is quicker. A PJD says only that waters “may be” jurisdictional. It cannot be used to find that a parcel has no jurisdictional waters, or that only some of the waters are jurisdictional. If the aim is to take features out of Section 404, a PJD will not do that. A PJD is not appealable.Which one to ask for
- AJD: the site will be sold and the owner wants a determination that goes with the property; the project is not moving into permitting yet; a lender or buyer wants a definite answer; or you are arguing that a feature is not jurisdictional.
- PJD: you are going to apply for a permit anyway and are not disputing jurisdiction, so speed matters more than a definitive answer.
What the Corps is deciding now
Under Sackett, a wetland is a water of the United States when two things are true:- The water it connects to is itself a water of the United States, meaning a relatively permanent water or a traditional navigable water.
- The wetland has a continuous surface connection to that water, so that as a practical matter you cannot tell where the water ends and the wetland begins.
- According to EPA’s rule status page, the 2023 definition of waters of the United States is preliminarily enjoined in Alabama, Florida, Louisiana, and Mississippi. In those states the agencies interpret the term under the pre-2015 regulatory regime, consistent with Sackett.
- A new definition is proposed (a November 2025 proposal and a September 2026 supplemental notice) but not final. According to EPA, the definition in effect when the Corps completes an AJD governs it, not the date of the request.
- EPA states that its March 2025 memo does not invalidate AJDs issued earlier, and that an AJD recipient can ask the Corps for a new AJD under the current approach.
Gulf Coast examples
These illustrate how the questions tend to come up. They are not predictions for any particular site.- Pine-flatwoods depression or wet flat. If it does not touch a relatively permanent water, it is a candidate for a non-jurisdictional finding, which makes this the classic AJD question.
- Tidal creek or marsh edge. Tidal waters are traditional navigable waters, and wetlands that abut them are generally jurisdictional. There is often little to gain from an AJD request.
- Wetland behind a berm, road, or levee. The question is whether the wetland touches the regulated water or is separated from it. Site-specific facts control.
- Roadside and drainage ditches. Their status depends on how they were constructed, what they drain, and whether they carry flow from a relatively permanent water.
- Bottomland hardwood floodplain. Connection to a river or bayou often decides the result.
How to request a JD
- Delineate first. Corps districts generally expect a delineation prepared with the Corps’ current methods before they make a determination. See wetland delineation.
- Choose AJD or PJD. The choice depends on whether the goal is a definitive answer or speed.
- Send the request to the Corps district that covers the site. Districts publish request forms, and the Mobile District, for example, has separate forms for a JD and a PJD. A JD can also be requested as part of a permit application.
- Include the supporting package. That usually means the delineation report, maps and a site location, aerial imagery, and a description of nearby waters.
- Corps review. The Corps reviews the package, may ask for more information, and often makes a site visit to check the flags before issuing the JD.
How long does a JD take?
The Corps does not publish a fixed turnaround. Its guidance says each JD should be completed as promptly as practicable in light of district workload, related permit actions, site conditions, and weather. A PJD is almost always faster, sometimes much faster than an AJD, and the AJD often takes substantially longer. Timelines vary by district and by season, so ask the district for a current estimate, and treat any figure without a source as a guess.What a JD does not do
A JD does not replace a state 401 water quality certification, a coastal consistency review, or a Florida Environmental Resource Permit. Mississippi, Alabama, Louisiana, and Florida all have their own programs. Losing federal jurisdiction is not the same as being free to fill a wetland. Florida also has its own state process for determining wetland and surface water boundaries, which is separate from the Corps’ JD. A JD is also not a nationwide or individual permit. If a feature is jurisdictional and you will discharge dredged or fill material, you still need the 404 path. See what is a 404 permit and 401 vs 404 permit.What Cypress does
The first step is usually a delineation, followed by an assessment of whether you need an AJD, a PJD, or just a permit. Cypress Environment & Infrastructure provides:- Wetland delineation and mapping that meets the Corps’ standards.
- A recommendation on AJD vs PJD, based on the site and the project schedule.
- Preparation of the JD request package and coordination with the Corps district, including site visits.
- The permit path afterward, where the JD shows jurisdictional features.
Jurisdictional determination FAQs
What is a jurisdictional determination?
A jurisdictional determination is the Corps’ written finding on whether a water or wetland on a site is a water of the United States and therefore subject to Section 404 of the Clean Water Act.
What is the difference between an approved and a preliminary JD?
An approved JD is a binding determination of what is and is not jurisdictional. A preliminary JD is non-binding: the aquatic resources are treated as if they were jurisdictional so a permit can proceed. A PJD cannot be used to remove a feature from Section 404.
How long is an approved JD valid?
Generally five years under Corps policy, unless new information warrants a revision earlier. A JD tied to an issued permit is handled as part of that authorization. Because the law and the site can change, confirm the status with the district before relying on an older JD.
Do I need a JD before I build?
Not always. If your site has no wetlands or waters, you don’t. If it does and you plan to fill them, you can apply for a permit using a PJD or with the delineation. An AJD is worth requesting when jurisdiction is in question or the answer has value outside the permit.
Is a JD the same as a wetland delineation?
No. A delineation is field work that maps the wetland boundary. A JD is the Corps’ finding on whether the mapped features are federally regulated.
Who can request a JD?
The landowner, or someone acting with the owner’s authorization, such as a permit applicant or a consultant, can request one from the Corps district that covers the site.
What does Sackett change about JDs?
It narrows which wetlands are federally regulated, to those with a continuous surface connection to a relatively permanent or traditional navigable water. More wetlands that are isolated or separated from regulated waters may be found non-jurisdictional. Site-specific facts decide each case.
If a wetland is not jurisdictional, can I fill it?
Not automatically. State wetland programs, coastal programs, Florida’s Environmental Resource Permit, stormwater rules, and local rules can still apply.