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Section 404 permits: filling wetlands and streams

A Section 404 permit is the federal permit for placing dredged or fill material in wetlands, streams, and other waters of the United States. The U.S. Army Corps of Engineers issues it, and in North Carolina the Wilmington District handles it. Most projects also need a 401 water quality certification from NC DEQ.

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Quick summary: This guide explains what a Section 404 permit covers, how nationwide and individual permits differ, how the state 401 certification fits, and what jurisdictional determinations and mitigation mean for a tract. It is for land buyers, owners, and builders with wetlands or streams on the land. The key takeaway: plan the site to avoid the water first, because the permit process asks you to prove you did.

What a Section 404 permit is

A Section 404 permit is federal approval to discharge dredged or fill material into waters of the United States, including many wetlands and streams. Section 404 of the Clean Water Act gives the Secretary of the Army the power to issue these permits, under 33 U.S.C. § 1344. The U.S. Army Corps of Engineers runs the program.

The Corps rule states the trigger plainly. A Department of the Army permit is required for the discharge of dredged or fill material into waters of the United States, unless an exemption applies, under 33 C.F.R. § 323.3. Fill material is material that replaces part of a water with dry land or changes its bottom elevation. Examples include rock, sand, soil, clay, and construction debris, under 33 C.F.R. § 323.2. Pilings placed so close that they act like fill also count.

Some activities are exempt from the permit, such as normal farming, silviculture, and ranching, and farm pond construction, under 33 U.S.C. § 1344(f). An exemption has limits. Ask the Corps before you rely on one.

Which waters it covers

The permit covers waters of the United States, and the federal definition of that term has changed more than once. EPA and the Army proposed a new definition in November 2025, in light of the Supreme Court’s 2023 decision on which wetlands federal law covers. They published a supplemental proposal on September 9, 2026, with comments due October 9, 2026. The final rule may change which wetlands the Corps regulates.

State rules can reach further. North Carolina regulates waters of the state, which include waters the federal program does not cover. Since Session Law 2023-63, the state no longer requires a permit for impacts to isolated or other non-404 wetlands. It still requires a permit for impacts to isolated streams, according to NC DEQ.

Jurisdictional determinations

A jurisdictional determination is the Corps’ written decision on whether, and where, regulated waters lie on a parcel. The Corps appeals rule defines two kinds in 33 C.F.R. § 331.2:

  • Approved jurisdictional determination. A Corps document that states whether waters of the United States are present on a parcel, or that maps their limits. It includes the basis for the decision, and the owner can appeal it.
  • Preliminary jurisdictional determination. A written indication that waters of the United States may be present, or their approximate location. It is advisory, and it cannot be appealed.

The determination starts with a wetland delineation. A consultant flags the wetland line in the field, and the Corps reviews it. See Wetland delineation: what it is and when land needs one.

Nationwide permits versus individual permits

The Corps issues general permits for minor work and individual permits for larger impacts. The Wilmington District uses both nationwide permits and regional general permits in North Carolina, according to its permits page.

Nationwide permits. These are general permits for categories of activity with no more than minimal individual and cumulative adverse effects. Federal law limits any general permit to five years, under 33 U.S.C. § 1344(e). The current set has 57 nationwide permits, which took effect on March 15, 2026, and expire on March 15, 2031, under the Corps final action. The Wilmington District adds regional conditions for their use in North Carolina. Some nationwide permits require a pre-construction notification to the Corps before work starts.

Regional general permits. The Wilmington District writes these for waters and wetlands of North Carolina, and it sets their conditions.

Individual permits. These are for projects with the potential for substantial environmental impacts. An individual permit requires a full public interest review, with public notice and agency coordination, as the Wilmington District explains. A letter of permission is a shorter individual permit for very minor work in special cases.

The short version: A project that fits a nationwide permit and its regional conditions moves faster. A project that needs an individual permit faces a public notice, a longer review, and a test of whether a less damaging alternative exists.

The 401 water quality certification

A 401 certification is the state’s statement that a federally permitted project will not degrade waters of the state or violate state water quality standards. In North Carolina, the Division of Water Resources issues it. A 404 permit from the Corps usually means a 401 certification is also needed, according to NC DEQ.

The Corps picks the type of federal permit, and a matching state certification follows. Most activities fall under a general certification. A project within a general certification’s thresholds does not need a formal application to DWR, but it must follow every condition. A project outside those thresholds needs an individual 401 certification with site-specific conditions. Riparian buffer rules apply on top of both. See Stream buffers in North Carolina.

Take action: Before you price land with wetlands or streams, find out where the mapped water and the soils point to regulated ground. Start with Acreage that holds up after the survey.

Avoid, minimize, then mitigate

The permit process asks you to avoid impacts first, minimize the rest, and offset what remains. The federal guidelines bar a discharge when a practicable alternative with less adverse impact on the aquatic ecosystem exists, under 40 C.F.R. § 230.10. Practicable means available and capable of being done after cost, existing technology, and logistics are considered.

For a project that is not water-dependent and that would fill a special aquatic site such as a wetland, the same rule presumes that a practicable alternative exists. The applicant must clearly show otherwise.

Compensatory mitigation. The Corps can require compensatory mitigation for unavoidable impacts. The Corps mitigation rule covers permittee-responsible mitigation, mitigation banks, and in-lieu fee programs, under 33 C.F.R. § 332.1. The same rule lets the district engineer deny a permit when no suitable mitigation exists.

NC DEQ asks the same questions. Its staff ask whether the project was designed to avoid wetlands, streams, and other resources, and whether unavoidable impacts were minimized, according to the 401 FAQ.

What it means for the land

Wetlands and streams on a tract change the layout, the schedule, and the usable acres. Roads, lots, and pads go around the water where they can. A road crossing, a culvert, or a utility line can need a permit even when every lot stays dry. Fill for a pad in a wetland draws the hardest review. See Bringing in fill dirt: permits, floodplain, and compaction.

The public record shows mapped wetlands, mapped streams, and soils that suggest wet ground. It cannot show the delineated line or the Corps’ decision on jurisdiction. Those come from fieldwork and the agencies. An environmental consultant prepares the delineation and the permit application. An attorney answers questions about permit conditions that bind a later owner. See Gross acres vs net acres: finding the usable land and Gross acres are not usable acres.

Key recap

  • A Section 404 permit from the Corps covers placing dredged or fill material in waters of the United States, including many wetlands and streams.
  • The definition of those waters is under rulemaking. A supplemental proposal was published on September 9, 2026.
  • Nationwide permits cover minor impacts. The current set took effect on March 15, 2026, and expires on March 15, 2031.
  • A 401 water quality certification from NC DEQ usually accompanies a 404 permit.
  • The process asks you to avoid impacts, minimize the rest, and offset what remains through mitigation.

Questions

What is a 404 permit?

A 404 permit is the federal permit for discharging dredged or fill material into waters of the United States, including many wetlands and streams. The U.S. Army Corps of Engineers issues it under Section 404 of the Clean Water Act. In North Carolina, the Wilmington District handles applications.

What is the difference between a 404 permit and a 401 certification?

The Corps issues the 404 permit for the fill itself. The state issues the 401 certification, which confirms that the project will not violate state water quality standards. In North Carolina, the Division of Water Resources within NC DEQ issues it. Most projects that need a 404 permit also need a 401 certification.

Do I need a 404 permit to build near a wetland?

Not if no fill or dredged material goes into the wetland or another regulated water. Work next to a wetland or stream can still trigger buffer, stormwater, or erosion rules. Ask the Corps and NC DEQ before you plan work close to the line.

How long is a jurisdictional determination good for?

Ask the Corps or your consultant for the date on the approved determination and the period it states. Rules on which waters are regulated have changed more than once, so a recent determination carries more weight than an old one.

References

Primary sources cited on this page, in APA style.

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