Environmental Protection Agency and Corps Propose New WOTUS Definition

Why the New WOTUS Proposal Matters

The definition of WOTUS determines which waters fall under key Clean Water Act programs, including Section 404 dredge-and-fill permits and Section 402 discharge permits. That matters for anyone touching wetlands, streams, ponds, ditches, stormwater systems, industrial sites, farms, transportation projects, pipelines, subdivisions, or public infrastructure.

The immediate legal trigger for the new proposal is the Supreme Court’s ruling in Sackett v. EPA. In that case, the Court narrowed federal authority by holding that covered wetlands must have a continuous surface connection to covered waters, making them effectively indistinguishable from those waters. Since then, EPA and the Corps have been under pressure to rewrite the rule in a way that is clearer, more durable, and more obviously tied to the Court’s language.

The agencies’ pitch is straightforward: federal jurisdiction should focus on relatively permanent waters and wetlands that truly touch them. Supporters call that common sense. Opponents call it a major rollback dressed up as a grammar lesson. Both sides, to be fair, know exactly what is at stake.

What the EPA and Corps Are Actually Proposing

1. A tighter definition of “relatively permanent” waters

The proposal defines “relatively permanent” waters as standing or continuously flowing waters that exist year-round or at least during the wet season. That standard would apply to tributaries and to certain lakes and ponds. In practical terms, the rule leans away from covering features that flow only in direct response to rainfall, such as many ephemeral streams, washes, and arroyos.

This is a major shift because the permanence of flow becomes a gatekeeper. If a waterbody does not meet that threshold, it may fall outside federal jurisdiction even if it matters a lot ecologically or hydrologically downstream.

2. A narrower definition of “tributary”

Under the proposal, a tributary must have relatively permanent flow, a bed and bank, and a connection to a downstream traditional navigable water or the territorial seas, either directly or through one or more waters or features that themselves convey relatively permanent flow. That sounds technical because it is technical. Welcome to WOTUS, where a ditch can ruin your afternoon and a seasonal flow chart can wreck your permit schedule.

The proposal also suggests that non-relatively permanent reaches can break jurisdiction upstream. That could be especially significant in the West, where many stream networks are intermittent or seasonally broken. For some projects, the legal question may no longer be “Is there water here?” but “How long is it here, how often, and what exactly is it touching?”

3. A stricter test for wetlands through “continuous surface connection”

This may be the heart of the rule. The agencies propose defining “continuous surface connection” for the first time. To qualify, wetlands would have to meet a two-part test: they must abut, meaning physically touch, a jurisdictional water, and they must have surface water at least during the wet season.

That is a meaningful narrowing. Wetlands that are nearby but separated by upland, berms, levees, roads, or other features may not qualify. Wetlands supported mainly by groundwater or saturated soil, without the required surface-water connection, also face a harder path to federal protection. The effect is to make adjacency less about ecological influence and more about visible, physical, surface-water contact.

4. Interstate waters would lose standalone status

The proposal removes interstate waters as an independent category of federal jurisdiction. Crossing a state line, by itself, would no longer automatically make a water federally regulated. Instead, the water would need to qualify under another covered category.

That may sound like a niche lawyer problem, but it reinforces the proposal’s broader logic: the agencies are trying to strip away categories they believe go beyond the Supreme Court’s current reading of the statute.

5. Several exclusions would be clarified or expanded

The proposed rule also spends real effort explaining what is not WOTUS. That includes:

Ditches: Ditches constructed or excavated entirely in dry land would generally be excluded, even if they carry relatively permanent flow. But navigable canals and certain channelized tributaries could still be jurisdictional.

Prior converted cropland: The rule would clarify that prior converted cropland remains excluded unless it is abandoned and reverts to wetlands. The proposal describes abandonment as land not being used for, or in support of, agriculture at least once in the preceding five years.

Waste treatment systems: The agencies would clarify the scope of this longstanding exclusion, including treatment ponds and lagoons designed to meet Clean Water Act requirements.

Groundwater: Groundwater would be expressly excluded, reinforcing a longstanding position but stating it more clearly in the rule text.

Why Supporters Like the Proposal

Supporters of the proposal tend to focus on one word: certainty. For builders, energy developers, utilities, and manufacturers, uncertainty can be expensive. For farmers and ranchers, it can also feel invasive, especially when ordinary land features like ditches, low spots, or seasonally wet areas become possible federal headaches.

Industry groups and agricultural organizations have praised the proposal for spelling out key terms that have long been vague. Home builders say clearer lines could reduce permit delays, project redesigns, consultant costs, and surprise jurisdictional findings. Farm groups argue the proposal better respects private property and helps distinguish between truly regulated waters and everyday agricultural features.

There is also a federalism argument behind the proposal. EPA and the Corps repeatedly emphasize that states and tribes are often better positioned to manage local land and water resources. In that framing, a narrower federal rule is not necessarily a retreat from regulation. It is a shift in who does the regulating.

Why Critics Are Worried

Critics see the same rule and draw the opposite conclusion. Environmental advocates, many Democratic-led states, and some water policy experts argue the proposal cuts too deeply and places too much weight on visible surface connections while undervaluing ecological reality. Wetlands can reduce flooding, trap sediment, filter pollutants, recharge water systems, and support habitat even when they do not look like a postcard-perfect marsh attached to a navigable river.

That concern is especially sharp in arid and semi-arid regions. In places like New Mexico and parts of the Southwest, many streams are ephemeral or intermittent, yet they still influence downstream water quality and ecosystems. State officials in those regions have warned that the proposal could leave huge stretches of local waters without federal coverage.

Another major concern is the patchwork problem. The agencies’ own analysis suggests that at least 24 states regulate surface waters or dredge-and-fill activities more broadly than the proposed federal rule, while 27 states plus the District of Columbia do not. That means the same wetland feature could face strict oversight in one state and far lighter oversight in another. Businesses may like clarity, but a 50-state patchwork is its own flavor of chaos.

And then there is the litigation issue. WOTUS rules have been sued so often that the phrase “durable definition” now sounds a little like a haunted house listing that says “great bones.” Many legal observers expect another court fight if this proposal becomes final.

What the Rule Could Mean in Practice

Permitting could shrink, especially under Section 404

The agencies expect the biggest practical effect to show up in the Section 404 dredge-and-fill program. Fewer jurisdictional waters means fewer federal permits, fewer mitigation requirements, and lower compliance costs for some projects. That is a real benefit for applicants, especially where timing and carrying costs are brutal.

States may become more important than ever

If federal jurisdiction narrows, state law matters more. Developers, utilities, and landowners will need to ask not just whether a feature is WOTUS, but whether it is a “water of the state.” In some places, the answer will still require permits. In others, not so much. The result may be less federal oversight but more homework.

Field work could get even more seasonal

Because the rule relies so heavily on wet-season flow and wet-season surface water, wetland delineations and jurisdictional determinations may depend even more on timing, historical imagery, local records, and hydrology tools. In other words, your project site may still need experts in boots, but now those experts may also need a weather archive, a satellite library, and the patience of a saint.

Specific Examples of Who Could Feel the Change

A home builder in a fast-growing metro area may find that fewer isolated wet spots trigger federal review, making project planning more predictable.

A farmer with drainage features and prior converted cropland may feel more secure that ordinary land management does not automatically invite federal jurisdiction.

A state environmental agency may inherit more responsibility if waters that lose federal coverage still need local protection.

A wetland consultant may spend less time arguing about broad ecological connections and more time documenting exactly when, where, and how surface water appears during the wet season.

A community downstream of headwaters or wetlands may worry that fewer federal permitting requirements could mean more filling, more runoff, or fewer buffers before pollution reaches larger waters.

Experiences From the Ground: What Living Through a WOTUS Shift Actually Feels Like

To understand the proposal, it helps to step away from the acronym soup and look at lived experience. For many people, WOTUS is not an abstract federal debate. It shows up as a survey delay, a permit bill, a redesign, a crop decision, or a fight over whether a shallow channel is a regulated water or just a stubborn piece of land that refuses to stay dry.

For farmers and ranchers, the experience is often about uncertainty and relief colliding at the same time. A producer may look at a roadside ditch, a low-lying swale, or a field edge that floods in spring and wonder whether routine work could trigger federal review. That is why agricultural groups have pushed hard for clearer exclusions, especially for ditches and prior converted cropland. From their perspective, a narrower rule means less second-guessing by distant agencies and fewer situations where ordinary land stewardship starts to feel like a legal trap.

For builders and developers, the experience is usually measured in money and calendar pages. If a site contains wetlands or tributary features, the question of federal jurisdiction can affect everything from land acquisition to engineering design to financing. When the line is blurry, projects slow down. Consultants get hired, reports multiply, and closing dates start sweating. Supporters of the proposal argue that a more explicit, surface-water-based test gives project teams a better chance of knowing early whether federal permits will be required. That kind of predictability can change whether a housing project pencils out at all.

For county engineers and public works departments, the experience is more operational. Drainage channels, flood-control features, stormwater conveyances, and utility work often sit right in the middle of WOTUS questions. Local officials tend to care less about ideological battles and more about whether they can maintain infrastructure without stumbling into federal permitting problems. A narrower rule may help with that. But it can also shift more responsibility to local governments and state regulators, who may then need to fill in the gaps with their own rules and enforcement.

For environmental advocates, anglers, hunters, and people living downstream, the experience can feel very different. They see wetlands and streams as working systems, not isolated puddles. A marsh that does not visibly touch a river year-round can still store floodwater, filter pollutants, and support habitat. A stream that runs only during part of the year can still send sediment, nutrients, or contaminants downstream when it does flow. From that perspective, the proposal risks ignoring how waters behave in the real world simply because they do not fit neatly into a courtroom-friendly definition.

And for state and tribal regulators, the experience may become more demanding. If federal jurisdiction retreats, pressure often moves downhill, both literally and administratively. States and tribes may face stronger calls to protect waters that lose federal coverage, but not every jurisdiction has the same laws, staff capacity, or political appetite to do that. So the practical experience of this WOTUS proposal may differ dramatically depending on where you stand: in a farm field, on a subdivision site, behind a county permit desk, or beside a wetland that does not look dramatic until the day it is gone.

Final Takeaway

The proposed EPA and Corps WOTUS definition is a serious attempt to lock federal water jurisdiction more tightly to the Supreme Court’s Sackett standard. It would narrow federal reach, clarify several long-fought terms, and likely reduce permitting burdens for many landowners and industries. It would also push more responsibility toward states and tribes, leave many wetlands and streams outside federal coverage, and almost certainly invite another round of legal and political combat.

So yes, the proposal may create more clarity. But clarity is not the same thing as consensus. In WOTUS land, the map may get cleaner while the fight gets louder. America, apparently, still cannot resist a good water argument.