EPA, Army Corps Propose Rule to Revise WOTUS Definition

What WOTUS Actually Means

The term “waters of the United States” sets the geographic reach of the Clean Water Act. If a waterbody is considered WOTUS, federal requirements can kick in under programs such as Section 404 dredge-and-fill permits, Section 402 discharge permits, Section 401 water quality certifications, spill response rules, and related water quality programs. If it is not WOTUS, federal authority becomes more limited, and the job of regulation often shifts to states or Tribes.

That is why this definition has been fought over for decades. It is not just a vocabulary issue. It is the legal boundary line between federal oversight and state control. It can shape whether a homebuilder redesigns a site, whether a farmer worries about a ditch, whether a utility project gets delayed, and whether a wetland gets protected or paved over. WOTUS is basically a very expensive answer to the question, “Does the federal government care about this water?”

Why EPA and the Army Corps Are Revisiting the Rule

The Supreme Court changed the playing field

The biggest reason for the rewrite is the Supreme Court’s 2023 decision in Sackett v. EPA. In that case, the Court rejected the broader “significant nexus” approach that had helped support federal jurisdiction over certain wetlands and waters. Instead, the Court emphasized a narrower view: federally regulated waters generally must be relatively permanent bodies of water, and wetlands must have a continuous surface connection to jurisdictional waters so that the boundary between water and wetland is hard to distinguish.

In other words, Sackett did not just tweak the rulebook. It took a bright marker to the map. That decision forced EPA and the Army Corps to rethink how the WOTUS definition should work in practice.

The current system is still a patchwork

Another reason for the new proposal is the messy reality of post-Sackett implementation. Because of ongoing litigation over the 2023 rule, the amended 2023 definition has been in effect in some states while other states have been operating under the pre-2015 regime as informed by Sackett. That kind of split is the regulatory version of trying to play baseball with two strike zones. It creates confusion for landowners, consultants, permit writers, and regulated industries that work across state lines.

EPA and the Corps say the new proposal is meant to provide greater certainty, more predictable permitting, and rules that can be applied more consistently nationwide. Whether it actually delivers that tidy outcome is the million-dollar wetland question.

What the Proposed WOTUS Rule Would Change

1. A new definition of “relatively permanent”

One of the proposal’s most important moves is defining “relatively permanent” for the first time in the regulatory text. Under the proposal, relatively permanent waters would be standing or continuously flowing bodies of surface water that flow year-round or at least during the wet season. That sounds simple enough, but it is a major narrowing move. Waters that flow only in direct response to rainfall, especially ephemeral features, would be less likely to qualify.

This matters for tributaries and for certain lakes and ponds. It also signals that the agencies want a more visible, surface-water-focused rule, rather than one that stretches federal jurisdiction based on occasional flow or broader ecological connections.

2. A new definition of “continuous surface connection”

The proposal also defines “continuous surface connection,” another term that sits at the center of the wetland debate. The agencies propose a two-part test: a wetland must abut, meaning touch, a jurisdictional water, and it must have surface water at least during the wet season. That is a stricter and more concrete framing than older regulatory approaches that often invited broader arguments about connectivity.

The practical effect is obvious. Wetlands that are nearby but separated, wetlands connected mainly through subsurface hydrology, or wetlands that do not hold surface water for the required duration would have a harder time qualifying. For developers and landowners, that is a clearer line. For conservation advocates, it is a much smaller circle.

3. A tighter tributary test

The proposal would also define “tributary” more narrowly. To count, a tributary would need relatively permanent flow, a bed and bank, and a connection to a downstream traditional navigable water or territorial sea, either directly or through waters or features that also convey relatively permanent flow. That means a break in the chain matters more than it used to.

This is especially important in places with highly seasonal hydrology, including parts of the arid West. A tributary that looks connected on a map may not count if the link downstream depends on non-relatively permanent features. So yes, this rule has all the glamour of a drainage diagram, but those diagrams can decide real projects.

4. Interstate waters would no longer be a standalone category

One of the proposal’s more striking legal changes is the deletion of interstate waters as an independent basis for federal jurisdiction. Under the agencies’ new view, crossing a state line is no longer enough by itself. An interstate water would still need to fit within another jurisdictional category to qualify.

That change reflects the agencies’ reading of Sackett and related Supreme Court precedent. It also reinforces the broader theme of the proposal: federal jurisdiction should turn on the nature of the water and its surface connection to navigable waters, not simply on geography or historical regulatory habit.

5. Clearer exclusions for ditches, groundwater, cropland, and waste treatment systems

The proposal also spends serious time on exclusions, because exclusions are where many practical headaches live. The agencies would clarify the ditch exclusion and exclude ditches constructed or excavated in dry land. They would add an explicit exclusion for groundwater. They would revise the prior converted cropland exclusion so that land remains excluded unless it has been abandoned and reverted to wetlands. And they would clarify the waste treatment system exclusion as well.

These changes are designed to answer the kinds of questions that make ordinary landowners reach for aspirin: Is this roadside ditch jurisdictional? What about this farmed area? What if this feature was built for wastewater treatment? The proposal tries to give more direct answers, which is one reason business groups and agricultural organizations have praised it.

What the Proposal Means for Permitting and Compliance

From a business and property perspective, the most important takeaway is that a narrower definition of WOTUS usually means fewer federal permits, fewer jurisdictional determinations, and lower compliance costs. EPA’s own analysis suggests the proposed rule would reduce the scope of federal jurisdiction and likely have its biggest effect on the Section 404 dredge-and-fill program. That is where delays, mitigation costs, and permitting uncertainty often become very expensive very quickly.

For industries such as construction, energy, mining, infrastructure, and agriculture, that is the headline benefit. A clearer and narrower federal line can reduce consulting bills, shorten project timelines, and decrease the number of sites that trigger federal review. It can also reduce the number of gray-area fights over features that look suspiciously watery after a storm and completely ordinary the next month.

But there is another side to that ledger. If fewer wetlands and streams fall under federal jurisdiction, some of the burden shifts to states and Tribes. States with robust wetland or surface water protections may step in. States with thinner programs may not. The result could be a more obvious state-by-state patchwork, which is great if you enjoy federalism and less great if you want one predictable national baseline.

The Debate: Clarity vs. Coverage

Why supporters like the proposal

Supporters say the rule finally does what it should have done immediately after Sackett: write the Court’s language into usable regulatory text. Agricultural groups, landowners, developers, and many industry-side attorneys have argued that the proposal provides clearer rules of the road. They especially like the treatment of ditches, prior converted cropland, groundwater, and the stronger emphasis on surface-water-based tests.

The basic pro-rule argument is easy to understand. If a property owner has to hire a consultant, a lawyer, a hydrologist, and maybe an emotional support spreadsheet just to figure out whether a feature is federally regulated, the system is not functioning very well. Supporters believe the proposal reduces that uncertainty and better respects state and tribal authority over local land and water resources.

Why critics are alarmed

Critics, however, argue that the proposal goes beyond merely implementing Sackett and risks shrinking federal protection too far. Conservation organizations and environmental policy groups warn that many wetlands and smaller streams provide flood control, water filtration, habitat support, and downstream water quality benefits even when they do not satisfy a strict visible-surface-water test. Their concern is that the rule’s bright lines may be easy to administer but too narrow to protect ecologically important waters.

That criticism is not just philosophical. A narrower federal definition can affect mitigation, restoration, stormwater planning, and the amount of legal leverage available to prevent filling or degrading wetlands. Critics also worry that states may not have the money, staff, or political appetite to replace lost federal oversight. So while supporters see clarity, opponents see a gap.

The Wet Season Problem: One Phrase, Many Future Arguments

If there is one term likely to generate fresh rounds of interpretation, it is “wet season.” The agencies use it to define both relatively permanent waters and continuous surface connection, but they do not turn it into a single neat national formula. That is understandable because hydrology differs dramatically across the country. The Southeast is not the arid West. Prairie potholes are not Appalachian hollows. Alaska is off doing Alaska things.

Still, the lack of a bright national metric means the proposal may trade one kind of uncertainty for another. Instead of arguing over “significant nexus,” future fights may revolve around how long the wet season is, what evidence proves it, and whether a particular feature held water for the right duration in the right place for the right reason. That may be legally cleaner than older tests, but it is not exactly dispute-proof.

My Take: This Is More Than a Technical Edit

The proposed WOTUS rule is not just a housekeeping exercise. It is a policy decision about who should regulate marginal waters and wetlands, how much certainty the federal government should offer, and where the balance between environmental protection and economic development should land. EPA and the Army Corps are clearly betting on a narrower federal baseline paired with a more explicit role for states and Tribes.

From a legal standpoint, that strategy makes sense as an attempt to build around Sackett. From a policy standpoint, it creates winners and losers. Landowners and regulated industries are likely to see practical benefits if the rule is finalized in something close to its current form. Wetlands advocates and water quality groups are likely to see a more fragile federal backstop. The rule may be clearer than its predecessors, but clarity and breadth are not the same thing.

And because this is WOTUS, no one should pretend the story ends with the proposal. The definition has changed across administrations, has been hammered by litigation, and has become one of the cleanest examples of how environmental law turns into political trench warfare. The mud, as always, is not just in the wetlands.

On-the-Ground Experiences With WOTUS: Where the Policy Gets Mud on Its Boots

If you want to understand why WOTUS inspires such intense reactions, do not start in Washington. Start on a piece of land where someone is trying to build, farm, restore, expand, repair, or simply understand what they own. In the field, WOTUS is rarely an abstract constitutional debate. It is a series of practical questions asked by real people wearing boots, holding maps, and hoping the answer does not add six months and a pile of fees to their plans.

For farmers and ranchers, the experience often revolves around ordinary features that do not feel remotely “federal” at first glance: drainage ditches, low spots, wet corners, tile-drained areas, or land that has been in production for years. Many have long argued that the line between routine land management and potential federal jurisdiction became too hard to predict. That is why the proposal’s changes to ditch exclusions, prior converted cropland, and groundwater resonate so strongly in agricultural circles. To many producers, clarity is not just nice policy language. It is the difference between running an operation and stopping everything to decode a rulebook.

For developers, homebuilders, and infrastructure planners, the experience is different but just as intense. A project can look straightforward on paper until a wetland edge, intermittent channel, or questionable drainage feature shows up during review. Then budgets shift. Site plans move. Financing gets nervous. Consultants get busy. The proposed rule appeals to these stakeholders because narrower and clearer federal triggers can reduce the number of projects that get pushed into expensive permitting and mitigation processes. When supporters talk about “red tape,” this is what they mean: not a theory, but a delay that shows up in invoices, carrying costs, and missed construction windows.

Local governments have their own version of the same headache. Road improvements, culvert replacements, utility work, flood projects, and stormwater upgrades can all run into jurisdictional questions. Public works departments are not exactly sitting on endless staff time and enchanted bags of money. A more predictable rule can make planning easier. But a narrower federal rule can also shift more responsibility to state and local systems that are already stretched thin. So some local officials welcome the clarity while quietly wondering who will pick up the long-term water management tab.

Environmental professionals and watershed advocates experience the debate from yet another angle. They tend to see the network, not just the parcel. Small tributaries feed larger waters. Wetlands store floodwater, filter pollutants, and support habitat even when they do not look dramatic on a glossy brochure. From that perspective, a tighter federal rule can feel less like a cleanup and more like a retreat. The concern is that once a wetland or stream falls outside federal jurisdiction, the practical chances of protecting it may vary wildly depending on the state, the budget, and local politics.

Even consultants, the unofficial cartographers of regulatory uncertainty, often live both realities at once. They know the current system can be difficult to explain, especially to landowners who want a yes-or-no answer. They also know that replacing one fuzzy standard with a new phrase like “wet season” may not eliminate hard calls; it may simply relocate them. The swamp may be smaller on paper, but the field notebook may still get thicker.

That is what makes the WOTUS debate so durable. It is not just about legal language. It is about how law lands on the ground. It decides who needs permits, who bears risk, who pays for studies, who protects upstream features, and who lives with downstream consequences. However the final rule turns out, the lived experience of WOTUS will still be measured in site visits, permit timelines, restoration plans, crop decisions, engineering revisions, and the occasional muttered phrase that cannot be printed in a family publication.

Conclusion

The EPA and Army Corps proposal to revise the WOTUS definition is a serious effort to translate Sackett into a more concrete federal rule. It narrows federal jurisdiction, sharpens several definitions, and doubles down on exclusions that matter to farmers, landowners, and project developers. At the same time, it raises legitimate concerns about how much wetland and stream protection will remain at the federal level and how much responsibility states will have to absorb.

For readers trying to cut through the acronym soup, here is the simplest takeaway: this proposal would make it easier to say what is not federally regulated, and that clarity could reduce permitting burdens. But it could also leave more waters dependent on state protection rather than federal law. That is the tradeoff at the heart of the entire WOTUS saga. Same swamp, new lines.

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