EPA, Corps Propose New Post-Sackett WOTUS Rule

If you work in construction, farming, energy, land development, local government, or environmental compliance, you already know that “WOTUS” is the acronym that can turn an ordinary project meeting into a legal philosophy seminar with muddy boots. WOTUS, short for “waters of the United States,” determines how far federal Clean Water Act jurisdiction reaches. And when that definition changes, permit timelines, mitigation obligations, enforcement risk, and project budgets can all change with it.

Now the U.S. Environmental Protection Agency and the U.S. Army Corps of Engineers have proposed a new post-Sackett WOTUS rule. The proposal is designed to more fully align federal regulations with the U.S. Supreme Court’s 2023 decision in Sackett v. EPA, a ruling that sharply narrowed how wetlands and certain other waters can be regulated under federal law. In plain English, the agencies are trying to answer an old question with a newly sharpened pencil: what waters count, what waters do not, and who gets to regulate the rest?

The stakes are enormous. For industry groups, the proposed rule promises clearer lines, fewer surprise permit triggers, and less regulatory whiplash. For environmental advocates and some Tribal interests, it raises a very different concern: that a narrower federal definition will leave more wetlands and streams outside federal protection and push major gaps onto states, Tribes, and local governments. In other words, one side sees a map with better borders. The other sees a map with missing guardrails.

This article breaks down what the new proposal does, why the agencies say it is necessary, what critics dislike, and how the rule could affect real-world permitting and compliance. Because WOTUS never arrives quietly, we will also look at the practical experiences of people who live with this issue every day.

What WOTUS Actually Means

The Clean Water Act regulates discharges into “navigable waters,” which the statute defines as “waters of the United States.” That phrase sounds straightforward until you ask whether it includes wetlands next to a creek, a roadside ditch, a seasonal stream, or a pond connected by an artificial feature. Suddenly, a simple phrase becomes a decades-long tug-of-war among agencies, courts, landowners, environmental groups, and regulated businesses.

WOTUS matters because it affects the reach of multiple Clean Water Act programs. If a waterbody is federally jurisdictional, activities may trigger permits or regulatory requirements under Section 402, Section 404, Section 401, Section 311, and related water quality programs. For project owners, that can mean additional studies, design changes, mitigation, agency coordination, and sometimes a calendar that moves like cold molasses.

That is why every administration seems to end up revisiting WOTUS. The definition affects who needs a permit, how long that permit takes, what gets enforced, and whether a state or the federal government takes the lead. It is not just a legal abstraction. It is the difference between “start grading next month” and “please enjoy another year of consultants, maps, delineations, and conference calls.”

Why Sackett Changed the Conversation

The Supreme Court’s 2023 decision in Sackett v. EPA changed the legal playing field in a major way. The Court rejected the broader “significant nexus” approach that had allowed regulators to assert jurisdiction over some wetlands and waters based on ecological connections. Instead, the Court embraced a narrower test. For wetlands to fall under the Clean Water Act, they must be adjacent to covered waters and have a continuous surface connection that makes it difficult to tell where the water ends and the wetland begins.

That was not a minor edit. It was a legal chainsaw. The decision effectively pushed the agencies away from broader ecological judgments and toward a more visible, surface-water-based approach. In response, EPA and the Corps issued a conforming rule in 2023 and later additional guidance in 2025. But the legal and practical landscape remained messy, with different rules operating in different states because of ongoing litigation.

So the new proposal is the agencies’ attempt to put more detailed regulatory language behind the post-Sackett standard. Think of it as the federal government saying: “Fine, Court, you want clearer lines? Here are some clearer lines. Everyone please stop yelling for five minutes.”

What the New Post-Sackett WOTUS Proposal Would Do

The proposed rule is narrower than the amended 2023 rule and is openly designed to reduce uncertainty while limiting federal jurisdiction in line with the agencies’ reading of Sackett. Several features stand out.

1. It removes “interstate waters” as a standalone category

One major revision is the deletion of the interstate waters category. Under the proposal, being interstate is not enough by itself to make a water federally jurisdictional. Instead, waters would need to qualify through the remaining jurisdictional categories and satisfy the new framework. That is a significant shift because it removes a shorthand path to federal coverage and requires a more specific analysis.

2. It trims the lakes-and-ponds category

The agencies also propose deleting the word “intrastate” from the lakes-and-ponds category. That sounds like a tiny word-level tweak, but in WOTUS land, small text can cause large headaches. The broader point is that lakes and ponds would still need the required relationship to traditional navigable waters or the territorial seas instead of getting pulled in by looser phrasing.

3. It revises exclusions and adds a groundwater exclusion

The proposal would revise exclusions for waste treatment systems, prior converted cropland, and ditches, while also adding an explicit groundwater exclusion. Groundwater has long been a pressure point in Clean Water Act debates, so putting that exclusion directly into the regulatory text gives the agencies a more express statement about what is out.

4. It adds key definitions that drive jurisdiction

EPA and the Corps also propose adding definitions for “relatively permanent,” “tributary,” “continuous surface connection,” “ditch,” “prior converted cropland,” and “waste treatment system.” These are not decorative definitions. They are the gears inside the machine.

Under the proposal, “relatively permanent” would mean standing or continuously flowing bodies of surface water that stand or flow year-round or at least during the wet season. That approach is intended to exclude ephemeral waters, meaning features that flow only in direct response to precipitation. A tributary, in turn, would need relatively permanent flow, bed and banks, and a qualifying downstream connection.

For adjacent wetlands, the proposal defines “continuous surface connection” as having surface water at least during the wet season and abutting, or touching, a jurisdictional water. That is a big deal because it creates a more concrete two-part test. Wetlands do not just need to be nearby in some broad ecological sense. They need the required surface-water relationship and physical connection contemplated by the proposal.

5. It would likely reduce the number of federally regulated waters

The agencies themselves say the revisions would limit the waters found to be jurisdictional when compared with the amended 2023 rule. That means fewer federal permits in some cases, lower compliance costs for some project proponents, and a larger role for states and Tribes in areas where they have their own wetland and water protection laws.

Why EPA and the Corps Say the Proposal Is Needed

From the agencies’ perspective, the proposal is about clarity, predictability, and legal durability. They argue that the Supreme Court gave them clear marching orders in Sackett, and the job now is to write regulations that ordinary landowners, field staff, consultants, and permit applicants can actually use.

EPA also says the proposal respects state and Tribal authority while keeping federal protection where appropriate. That framing matters. Rather than presenting the rule as a retreat, the agencies present it as a recalibration: a more limited federal role that still protects core waters while leaving more room for local governance.

Industry groups largely like that argument. Home builders, manufacturers, and other regulated parties have praised the proposal for offering a more predictable permitting process. Their message is simple: if the line of federal jurisdiction is clearer, projects can move faster, housing costs may face less regulatory pressure, and businesses can make investment decisions without playing aquatic roulette every time they cross a drainage feature.

Why Critics Think the Rule Goes Too Far

Environmental groups and some Tribal advocates see the proposal very differently. Their concern is not that the rule is unclear. Their concern is that it is clearly narrow.

Critics argue that the proposal may leave many wetlands and intermittent or seasonal features outside federal protection, even when those waters matter for flood control, water quality, habitat, and downstream community resilience. They also argue that the rule’s reliance on surface-water indicators and wet-season concepts may understate real-world hydrologic connectivity, especially in regions where important aquatic systems are not wet in visually obvious ways all year long.

Another concern is federalism in practice. It is easy to say states and Tribes can regulate more. It is harder to guarantee they all have the same legal authority, staffing, funding, political support, and enforcement capacity. Some states already have robust wetland programs. Others do not. That means the same wetland could face very different protection depending on which side of a state line it sits. Nature, annoyingly for regulators, does not check county maps before moving water around.

Tribal perspectives add another layer. Some Tribal advocates argue that narrowing federal jurisdiction may leave upstream waters more vulnerable even when downstream Tribal resources depend on them. Where Tribes lack authority over upstream non-Tribal sources, reduced federal protection can create practical gaps that are not solved just by saying local control is good policy.

The Patchwork Problem Is Still Here

Even before any final rule arrives, WOTUS implementation has been fragmented. Because of litigation involving the 2023 rule, the agencies have been applying different regulatory regimes in different parts of the country. That patchwork is one reason the agencies say they want a clearer, more durable rule.

But here is the catch: even a clearer rule may not bring instant peace. WOTUS rulemakings almost always trigger litigation, and this proposal already sits in a legal environment shaped by injunctions, competing interpretations, and deeply entrenched political and economic interests. So yes, the proposal aims to provide predictability. Whether it can survive long enough to achieve it is a separate question with its own dramatic soundtrack.

What This Could Mean for Permitting, Compliance, and Project Planning

For permit applicants, the practical impact could be substantial. If fewer waters are jurisdictional, some projects may avoid Section 404 dredge-and-fill permitting or face a narrower scope of federal review. Jurisdictional determinations could become more focused on visible hydrology, wet-season flow, abutment, and whether non-relatively permanent reaches sever upstream jurisdiction.

That could reduce costs for some landowners, farmers, builders, and infrastructure developers. It could also change how consultants approach delineations, site selection, and early due diligence. Expect more focus on hydrologic records, mapping, field observations, seasonal timing, culverts, surface-water continuity, and how regional wet-season conditions are documented.

At the same time, reduced federal jurisdiction does not always mean reduced regulation. In some states, project proponents may still need to navigate state wetland programs, state water quality laws, local ordinances, or Tribal requirements. In other places, the regulatory gap may be real. So the smart question is not just, “Is this federally jurisdictional?” It is, “Who still regulates this feature if the federal government does not?”

Real-World Experiences in the Post-Sackett WOTUS Era

On the ground, the experience of post-Sackett WOTUS is less like reading a neat legal memo and more like walking through a field with three maps, two consultants, one nervous client, and weather that refuses to cooperate. For landowners, the first practical lesson has been timing. A feature that looks dry in August may tell a very different story during the wet season. That means site visits, photo logs, hydrology records, and seasonal observations suddenly matter even more. A lot of people have learned the hard way that “it was dry when I saw it” is not a legal strategy.

For developers and builders, the experience has been a mixed bag. Some see opportunity in a narrower rule because it may reduce federal permitting burdens on marginal features, roadside drainage elements, or wetlands with weaker surface connections. They like certainty, and they especially like certainty that does not require eighteen months of consultant invoices. But many in the regulated community also know that a narrower federal rule does not magically eliminate risk. It can simply move the fight. Instead of debating federal jurisdiction, they may find themselves sorting through a complicated set of state and local requirements that vary wildly from one jurisdiction to another.

Farmers and ranchers often describe the issue in practical terms, not abstract doctrine. They want to know whether they can maintain drainage, manage fields, improve access, or work near low spots and ditches without stepping into a federal permit puzzle. In that sense, the appeal of the proposal is obvious: clearer boundaries are easier to live with than vague ones. But agricultural operations also deal with changing rainfall patterns, seasonal saturation, and longstanding features that are difficult to classify cleanly. The rule may promise a clearer line, yet the real world still enjoys drawing squiggles.

Environmental consultants have perhaps the most relatable experience of all: they are the translators in a conversation where the law says one thing, the site conditions say another, and the client says, “Can you just tell me yes or no?” Their work is becoming more tied to evidence of wet-season flow, surface-water continuity, bed-and-bank characteristics, and the role of artificial features like culverts. That creates opportunities for more disciplined analysis, but it also means more documentation and more room for disagreement when facts are close.

For Tribes, watershed groups, and environmental advocates, the experience often feels more urgent. The concern is not just which boxes get checked in a permit file. It is whether narrowing federal jurisdiction leaves important waters vulnerable upstream of communities that depend on them downstream. In regions where local governments or state programs are underfunded, federal retrenchment can feel less like efficiency and more like abandonment. That is why the debate remains so heated: it is not only about legal definitions, but also about who bears the burden when protection becomes more fragmented.

The biggest practical takeaway is this: the post-Sackett world rewards early diligence. Anyone touching land, water, drainage, wetlands, or infrastructure should assess potential jurisdiction early, document site conditions carefully, track state law just as closely as federal law, and avoid assuming that “narrower federal rule” means “no problem.” In WOTUS country, overconfidence is usually the first feature to get flooded.

Final Takeaway

The EPA and Army Corps’ new post-Sackett WOTUS proposal is not just another paperwork exercise. It is a serious attempt to rewrite the federal jurisdictional map after a Supreme Court decision that narrowed the legal terrain. The proposal would draw brighter lines, rely more heavily on relatively permanent waters and continuous surface connections, revise exclusions, and likely reduce the number of waters subject to federal regulation.

Supporters say that is exactly the point. Critics say that is exactly the problem.

Both sides are right about one thing: this rule matters. It matters for wetlands, for permitting, for development, for farming, for Tribal sovereignty, for water quality, and for the ongoing balance between federal authority and state power. Whether the final rule becomes a durable settlement or simply the next episode in the WOTUS saga, it is already shaping how people think about land, water, and regulatory risk in America.

And yes, WOTUS is still the most complicated way possible to ask a seemingly simple question: “Is that puddle my problem?”