Editor’s note: This article is based on current public information from U.S. regulatory materials, Federal Register notices, Clean Water Act background, legal analysis, agriculture and construction policy commentary, and environmental law updates available through early 2026.
The phrase “Waters of the United States,” better known as WOTUS, may sound like something only environmental lawyers discuss over cold coffee and footnotes. In reality, it affects farmers trying to improve drainage, builders planning a subdivision, counties replacing culverts, energy companies laying infrastructure, and landowners wondering whether that soggy patch behind the barn is simply a puddle with ambition or a federally regulated wetland.
The U.S. Environmental Protection Agency and the Department of the Army, acting through the U.S. Army Corps of Engineers, have proposed a rule to revise the WOTUS definition under the Clean Water Act. The proposal is designed to align federal water jurisdiction with the U.S. Supreme Court’s 2023 decision in Sackett v. EPA, a landmark case that rejected the broad “significant nexus” test and emphasized a more limited approach to federally protected waters.
For businesses, developers, farmers, ranchers, local governments, environmental advocates, and property owners, this is not a small paperwork shuffle. The WOTUS definition determines where federal Clean Water Act permitting applies. That means it can influence project timelines, compliance costs, environmental protections, wetland reviews, and the ever-popular American pastime of asking, “Do I need a permit for this?”
What Is WOTUS and Why Does It Matter?
WOTUS is the legal phrase that defines which waters fall under federal jurisdiction through the Clean Water Act. If a waterbody is considered WOTUS, then federal programs may apply, including Section 404 permits for dredged or fill material, Section 402 National Pollutant Discharge Elimination System permits, oil spill rules, water quality standards, total maximum daily load programs, and state water quality certification requirements.
That sounds technical because it is. But the practical meaning is simple: if a stream, wetland, ditch, pond, or other water feature is federally jurisdictional, activities affecting it may require review or permits from the Army Corps, EPA, or state agencies operating under Clean Water Act authority.
For a farmer, WOTUS can influence whether a drainage improvement or ditch maintenance project triggers federal review. For a housing developer, it can shape site design and mitigation costs. For a county, it can affect road, bridge, and flood control projects. For environmental groups, WOTUS is central to protecting wetlands, streams, wildlife habitat, flood storage, and downstream water quality. In short, WOTUS is where law, mud, money, and ecology all meet in one very complicated puddle.
The Legal Backdrop: From Rapanos to Sackett
The fight over WOTUS did not begin yesterday. Federal agencies, courts, states, industry groups, farmers, and environmental organizations have debated the scope of Clean Water Act jurisdiction for decades. One major turning point came in Rapanos v. United States in 2006, where the Supreme Court produced competing tests for determining federal jurisdiction. One approach focused on relatively permanent waters and wetlands with a continuous surface connection. Another approach, known as the “significant nexus” test, looked at whether waters significantly affected the chemical, physical, or biological integrity of downstream navigable waters.
For years, the significant nexus standard played a major role in federal implementation. Supporters argued it reflected real hydrology: small streams and wetlands can affect downstream rivers even when the connection is not obvious to someone standing there in boots. Critics argued it was too flexible, too unpredictable, and too dependent on case-by-case agency judgment.
Then came Sackett v. EPA in 2023. The Supreme Court rejected the significant nexus test and held that Clean Water Act jurisdiction over wetlands is limited to wetlands that are, as a practical matter, indistinguishable from waters of the United States because they have a continuous surface connection to covered waters. In plain English: nearby is not enough. Damp is not enough. “Looks important to a regulator with a clipboard” is not enough. The connection must be more direct.
What the Proposed WOTUS Rule Would Change
The proposed rule aims to revise the current WOTUS definition by clarifying key terms and narrowing categories of federally jurisdictional waters. The agencies say the goal is to provide predictability, consistency, and a clearer line between federal authority and state or tribal authority.
1. A Clearer Definition of “Relatively Permanent”
One major proposed change is the definition of “relatively permanent.” Under the proposal, this term would generally refer to standing or continuously flowing bodies of surface water that flow year-round or at least during the wet season. This matters because tributaries, lakes, and ponds may need to meet this relatively permanent standard to qualify as WOTUS.
The use of “wet season” is important. It recognizes that many areas of the United States have seasonal hydrology. A stream in Arizona does not behave like a stream in Vermont, and pretending otherwise is how rulebooks start wearing clown shoes. Still, critics may argue that “wet season” introduces its own uncertainty because wet seasons vary by geography, climate, and year-to-year weather patterns.
2. A Two-Part Test for Continuous Surface Connection
The proposal would define “continuous surface connection” in a way that requires wetlands to meet two core conditions. First, they must abut, or physically touch, a jurisdictional water. Second, they must have surface water at least during the wet season. This is meant to implement the Supreme Court’s language that regulated wetlands must be difficult to distinguish from covered waters.
For landowners, this may reduce situations where wetlands are regulated simply because they are nearby or separated from a jurisdictional water by a berm, road, dune, or other barrier. For environmental advocates, the concern is that wetlands with important downstream functions could fall outside federal protection if they lack the required surface connection.
3. Removal of Interstate Waters as a Stand-Alone Category
The proposal would remove interstate waters as an independent category of WOTUS. In other words, a waterbody would not automatically become federally jurisdictional merely because it crosses a state line. It would still qualify if it fits another jurisdictional category, such as a traditional navigable water, territorial sea, relatively permanent tributary, or qualifying lake, pond, impoundment, or adjacent wetland.
This is a significant shift because interstate waters have historically occupied a central place in federal water regulation. Supporters of the change see it as faithful to the Sackett decision and the Clean Water Act’s text. Opponents may argue that water pollution does not politely stop at state borders, even when legal definitions try to make it RSVP.
4. More Detailed Treatment of Tributaries
The proposed rule would clarify that jurisdictional tributaries must be relatively permanent and must connect to downstream traditional navigable waters or territorial seas, either directly or through features that convey relatively permanent flow. This could include natural or man-made features if they provide the necessary connection.
The practical effect is that some ephemeral features, dry washes, or drainage paths that flow only in direct response to rainfall may be less likely to fall under federal jurisdiction. However, site-specific facts will still matter, especially where seasonal flow, bed-and-bank features, and downstream connections are present.
5. Clarified Exclusions for Ditches, Cropland, Waste Systems, and Groundwater
The proposed rule would also preserve and clarify exclusions for certain ditches, prior converted cropland, and waste treatment systems. It would add or reinforce an exclusion for groundwater, including groundwater drained through subsurface systems such as agricultural tile drains.
For agriculture, the prior converted cropland issue is especially important. The proposal seeks to give farmers clearer rules about when land remains excluded and when that exclusion may be lost, such as when land is abandoned and reverts to wetlands. It also attempts to avoid penalizing agricultural producers for conservation uses that support farming operations.
Ditches are another practical battlefield. A ditch dug in dry land for drainage or roadside purposes is not the same thing as a natural stream, even if both occasionally carry water and both can ruin your shoes. By defining ditch-related exclusions more clearly, the agencies hope to reduce confusion for farms, local governments, and transportation departments.
Who Supports the Proposed Rule?
Many agriculture, construction, energy, and property-rights groups are likely to support the general direction of the proposal. Their argument is straightforward: landowners and businesses need a clear, durable rule that does not require hiring a lawyer, consultant, hydrologist, soil scientist, and possibly a wizard just to determine whether federal jurisdiction applies.
For farmers and ranchers, the appeal lies in predictability. Routine agricultural activities often depend on drainage, ditch maintenance, pond management, and land improvements. A narrower and clearer WOTUS definition may reduce permitting uncertainty and compliance costs, especially in rural areas where water features can be seasonal, altered, or difficult to classify.
Developers and infrastructure planners may also welcome the rule because federal wetland determinations can influence design, financing, permitting timelines, mitigation requirements, and project risk. When definitions change repeatedly, the result is a planning headache. Nobody enjoys redesigning a project because a regulatory definition changed after the survey crew already packed up.
Who Is Concerned About the Proposed Rule?
Environmental organizations and some water quality advocates are likely to raise concerns that the proposal could leave many wetlands and small streams outside federal protection. Wetlands filter pollutants, store floodwater, recharge groundwater, support wildlife, and help maintain downstream water quality. Even wetlands without an obvious surface connection may perform ecological functions that matter far beyond their property boundaries.
Critics may also argue that narrowing federal jurisdiction shifts more responsibility to states and tribes, which have different resources, laws, enforcement capacity, and political priorities. Some states have strong wetland protection programs. Others have fewer protections. That means the same type of wetland might receive different treatment depending on where it sits on the map.
This is the heart of the WOTUS debate: one side wants a bright federal line to prevent regulatory overreach; the other worries that a line drawn too narrowly leaves important water resources exposed. Both sides can point to real-world examples. That is why WOTUS has become less of a regulation and more of a long-running national group project where everyone brought a red pen.
What It Means for Clean Water Act Permitting
If finalized, the revised WOTUS definition could affect jurisdictional determinations, permitting obligations, mitigation planning, and enforcement risk. A jurisdictional determination from the Army Corps tells a property owner whether WOTUS is present on a site and where the limits of federal jurisdiction are located. These determinations can be essential for developers, farmers, mining projects, utility corridors, highways, and industrial facilities.
With a narrower definition, some features that previously required federal analysis may no longer qualify. That could speed up certain projects and reduce federal permitting costs. However, it does not mean “anything goes.” State wetlands laws, stormwater rules, local floodplain ordinances, endangered species requirements, and other environmental laws may still apply. Also, if a feature remains jurisdictional, Clean Water Act compliance can still be serious business.
The safest practical takeaway is this: the proposed rule may reduce federal jurisdiction in some cases, but it will not eliminate the need for careful site review. Water has a habit of making simple legal theories look soggy.
Impact on Farmers and Rural Landowners
For farmers, the WOTUS proposal is especially relevant because agricultural land often includes ditches, tile drainage, stock ponds, seasonal channels, low spots, and previously converted cropland. The proposed rule’s emphasis on exclusions and clearer definitions could make it easier for farmers to understand when Clean Water Act permits are required.
The proposal would not change existing Clean Water Act exemptions for many routine farming, ranching, and forestry activities under Section 404(f). That matters because farmers often maintain irrigation ditches, drainage ditches, farm roads, and conservation practices as part of normal operations. Still, exemptions have limits, especially if an activity changes the use of waters, reduces their reach, or impairs flow or circulation.
In real life, this means farmers should not assume every activity is exempt simply because it happens on a farm. A field may be agricultural land, but a jurisdictional wetland or stream can still trigger rules. The revised WOTUS proposal may make the line clearer, but it will not replace professional review for complicated sites.
Impact on Developers, Builders, and Local Governments
Developers and local governments often experience WOTUS through the permitting process. Before grading, filling, road building, utility installation, or stormwater work, a project team may need wetland delineations, jurisdictional determinations, and permit planning. A clearer WOTUS definition could help teams estimate risk earlier and avoid expensive surprises.
For example, a residential development site with an isolated low area may be treated differently under a narrower rule than a site with a wetland directly touching a relatively permanent stream. A county replacing a culvert may face different review if the channel has seasonal but predictable flow compared with a dry upland ditch constructed entirely in dry land.
However, the proposal does not erase complexity. The meaning of “wet season,” the presence of surface water, the physical connection to downstream waters, and the classification of man-made features can still require technical judgment. In other words, the rule may reduce fog, but it will not make every site map read like a children’s menu.
Why the Rule May Still Face Litigation
WOTUS rules have been rewritten, challenged, blocked, revived, narrowed, expanded, and generally tossed around like a legal beach ball for years. Since 2015, the regulatory definition has shifted multiple times across administrations and court decisions. This new proposed rule is unlikely to end the debate overnight.
Supporters may argue that the proposal finally respects the Supreme Court’s limits and gives landowners predictable rules. Opponents may argue that the agencies have gone too far in narrowing federal authority and weakening protection for wetlands and streams. Lawsuits could challenge how the rule interprets Sackett, how it defines wet season, how it treats interstate waters, or whether it properly fulfills the Clean Water Act’s objective to restore and maintain the integrity of the nation’s waters.
The result may be another patchwork period where different rules apply in different states, depending on injunctions and litigation outcomes. For regulated parties, that means national headlines are useful, but local legal status remains critical.
Experience-Based Perspective: What This Rule Looks Like on the Ground
In practical experience, WOTUS is rarely confusing because people do not care about clean water. It is confusing because real landscapes refuse to behave like neat legal categories. A consultant may walk a site in March and find standing water, hydrophytic vegetation, and saturated soils. The same site in August may look dry enough for a picnic. A farmer may see a field edge that only holds water after spring rains. A regulator may see a wetland system with seasonal function. A developer may see six months of delay hiding behind cattails.
This is why the proposed WOTUS revision matters so much. On paper, “continuous surface connection” sounds simple. On the ground, it asks practical questions: Is the wetland touching a jurisdictional water? Is surface water present during the wet season? Is there a clear break between the wetland and the stream? Is the feature natural, excavated, altered, seasonal, or simply a ditch doing ditch things?
Consider a rural property where a farmer wants to clean out a drainage ditch along a field. Under a broader interpretation, the farmer may worry that the ditch, nearby wet areas, or downstream connections could trigger federal review. Under the proposed approach, a ditch constructed in dry land and excluded by rule may be easier to identify as non-jurisdictional. That clarity could save time, money, and stress. It could also reduce the number of projects delayed by uncertainty rather than actual environmental risk.
Now consider a developer evaluating a mixed-use project near a seasonal stream. The project team may still need a wetland delineation, hydrology assessment, and possibly an approved jurisdictional determination. If wetlands physically touch a relatively permanent water and hold surface water during the wet season, federal jurisdiction may still apply. The proposed rule does not give developers a golden shovel that magically digs through environmental obligations. It simply changes the test used to decide which waters fall under federal authority.
Local governments face another reality. Roadside ditches, culverts, stormwater channels, and flood control features are everywhere. Public works departments need rules that are clear enough to apply without turning every maintenance project into a legal seminar. A more defined WOTUS rule may help counties plan routine work, but they still need documentation. In permitting, the old saying applies: if it is not documented, it did not happenexcept for mud on your boots, which somehow documents itself everywhere.
Environmental experience adds a caution. Wetlands that look small or disconnected can still provide flood storage, wildlife habitat, sediment capture, and nutrient filtering. When federal jurisdiction narrows, the importance of state, tribal, and local protections increases. Strong state programs may fill the gap. Weak programs may leave resources vulnerable. That uneven protection is one reason WOTUS remains controversial.
The best practical approach is not panic and not celebration. It is preparation. Landowners should keep records, seek professional site reviews when needed, and avoid assuming that a proposed rule is already final law. Developers should build flexibility into project timelines. Farmers should understand both exclusions and exemption limits. Environmental groups should track state-level protections, not just federal definitions. And everyone should remember that water law is like water itself: it flows downhill, finds cracks, and occasionally floods the basement when ignored.
Conclusion
The EPA and Army Corps proposal to revise the WOTUS definition is one of the most important Clean Water Act developments in recent years. It seeks to implement Sackett v. EPA by narrowing federal jurisdiction, defining key terms such as “relatively permanent” and “continuous surface connection,” removing interstate waters as a stand-alone category, and clarifying exclusions for ditches, prior converted cropland, waste treatment systems, and groundwater.
For supporters, the proposed rule promises clarity, predictability, reduced red tape, and stronger respect for state and tribal authority. For critics, it risks reducing federal protection for wetlands and streams that support flood control, habitat, and downstream water quality. For everyone else, it means one thing: WOTUS is still not boring, no matter how hard the acronym tries.
As the agencies move toward a final rule, landowners, businesses, farmers, developers, local governments, and environmental advocates should pay close attention. The definition of WOTUS may be written in regulatory language, but its effects are felt in fields, wetlands, job sites, neighborhoods, rivers, and permits across the country.
