Riparian rights and littoral rights both govern what owners of waterfront property can do with the water next to their land, but they apply to different kinds of water. Riparian rights belong to owners along flowing water like rivers, streams, and creeks. Littoral rights belong to owners along standing or tidal water like lakes, ponds, and the ocean. Both are appurtenant, meaning they attach to the land itself and transfer automatically when the property is sold. The practical difference between them is where your property line ends, what sits beneath the water, and what rules govern your use of the water.
The Core Distinction
The two doctrines sort waterfront land by the behavior of the water, not by the size of the water body. A small creek on a rural lot triggers riparian rules. A large inland lake triggers littoral rules. Oceanfront property is littoral. A river that widens into a reservoir can straddle both categories along different stretches.
Neither right lets you own the water itself. What you own is land, and what you hold with respect to the water is a right of use that comes with the land. The specific contours of that right, including how far your deed reaches and what you can build, differ sharply between the two categories.
Where Your Property Line Actually Ends
This is where the two systems diverge most clearly, and it’s the question that determines what you actually bought.
Riparian Property Lines on Flowing Water
On a non-navigable stream, most states apply the ad medium filum aquae rule: your property line extends to the center of the stream channel. If a neighbor owns the opposite bank, each of you owns half the bed. If you own both banks, the entire bed is yours. The submerged land beneath a non-navigable creek is private property.
Navigable rivers work differently. Under the Equal Footing Doctrine, each state took title to the beds of waters that were navigable at the time the state joined the Union. The Supreme Court set this out in 1845, holding that navigable waters and the soils beneath them belong to the state rather than to private landowners along the bank.1Justia. Pollard’s Lessee v. Hagan, 44 U.S. 212 (1845) The Submerged Lands Act later codified this, defining state-owned submerged lands as those under navigable non-tidal waters up to the ordinary high water mark.2Office of the Law Revision Counsel. 43 USC 1301 – Definitions Along a navigable river, your ownership stops at the water’s edge.
Littoral Property Lines on Standing and Tidal Water
Littoral boundaries don’t reach the center of anything. They stop at a high water line, and the specific line depends on whether the water is tidal.
On ocean coasts and tidal bays, your property extends to the mean high water line, defined by NOAA as the average of all high water heights observed over a 19-year period.3National Oceanic and Atmospheric Administration. Tidal Datums Everything below that line belongs to the state.4National Oceanic and Atmospheric Administration. Shore and Sea Boundaries Volume 1 The wet sand between high and low tide is generally open to public access, so you can’t fence it off even though it sits right next to your lot.
For inland lakes and other non-tidal water, the boundary is the ordinary high water mark (OHWM) instead. Federal regulations define the OHWM by physical characteristics on the shore: a natural impression on the bank, changes in soil, or the destruction of land-based vegetation.5eCFR. 33 CFR Part 328 – Definition of Waters of the United States A surveyor identifies this line based on visible evidence rather than tidal calculations.
In both tidal and non-tidal littoral settings, the state typically holds title to the submerged bed. You own the dry upland.
What You Can Do With the Water
Riparian and littoral rights are both usufructuary. You can use the water, but you can’t possess it, sell it by the gallon, or prevent it from flowing to your neighbors.
Courts evaluate use through the Doctrine of Reasonable Use. Household needs like drinking, cooking, and watering a garden are almost always reasonable. Commercial and agricultural uses like large-scale irrigation or industrial withdrawal face more scrutiny because they consume more water and are more likely to harm others along the same water body. The test compares your use against the needs of every other owner along that watercourse. An upstream owner who installs a dam or heavy pumping system that cuts off a downstream neighbor’s supply is going to lose that dispute.
Owning riverfront or lakefront land is not the same as owning unlimited access to the water for any purpose. The right is real, but it’s always balanced against the same right held by every other owner along the shore.
Public Access on Navigable Water
Private ownership runs into its hardest limit when the water is navigable. Federal regulations define navigable waters as any waters subject to tidal influence or that are used, have been used, or could be used for interstate or foreign commerce.6eCFR. 33 CFR Part 329 – Definition of Navigable Waters of the United States Once classified as navigable, that designation is permanent.
Under the Public Trust Doctrine, states hold the submerged land and water surface of navigable waters in trust for the public. The Supreme Court established in 1892 that states cannot hand these resources entirely to private parties.7Justia. Illinois Central R. Co. v. Illinois, 146 U.S. 387 (1892) If your property borders a navigable waterway, you cannot block boats, restrict fishing, or claim the waterbed as private. Even old deed language suggesting ownership of the bed doesn’t override navigability.
When the Shoreline Moves
Water boundaries aren’t fixed. Unlike a fence line, the edge of a river or lake shifts over time, and your legal property line can shift with it. The rule depends on how the change happened.
Gradual changes move the boundary:
- Accretion: water slowly deposits soil along your bank, and the new land becomes yours.
- Reliction: water permanently recedes, exposing dry ground that is added to your property.
- Erosion: water gradually wears away your bank, and your property shrinks.
The Submerged Lands Act acknowledges all three, noting that the boundary of state-owned submerged lands is modified by accretion, erosion, and reliction.2Office of the Law Revision Counsel. 43 USC 1301 – Definitions The change must be gradual and imperceptible. If you can’t notice it happening day to day, the boundary follows the water.
Sudden changes do not move the boundary. When a flood cuts a new channel through a river bend, or a storm strips away a section of coastline overnight, that’s avulsion, and the legal boundary stays where it was before the event. A landowner whose property was on one side of a river before a flood might end up with land on both sides, but the original line still applies. Proving whether a change was gradual or sudden often requires expert testimony and historical surveys, and that’s where title disputes get expensive.
Check Your State Before Assuming Riparian Rules Apply
Everything above about riparian rights assumes a state that recognizes the riparian doctrine. Many western states don’t.
Under prior appropriation, water rights aren’t tied to land ownership at all. The first person to divert water from a source and put it to beneficial use gains a senior right. First in time, first in right. During a drought, senior holders get their full allocation before junior holders receive anything. You can own a long stretch of riverbank and still have no right to use the water if someone upstream claimed it decades ago.
The geographic split roughly follows climate. Eastern states with reliable rainfall generally use the riparian system. Western states where scarcity drove development adopted prior appropriation. California, Oregon, and Washington use hybrid systems that blend elements of both.8Federal Judicial Center. An Overview of Surface Water Use Rights in the United States Some states that historically followed riparian rules, like Texas and Kansas, have largely shifted to prior appropriation.
Even within riparian states, many have moved toward regulated riparianism, where a state agency controls who can withdraw how much water and for how long. You may need a permit before making any significant withdrawal, and permits expire after a set period. Missing the statutory window can mean losing your water use rights entirely.
Permits Before You Build on the Shore
Owning waterfront land doesn’t mean you can build whatever you want along it. Two federal laws create permitting requirements that catch many owners off guard.
Section 10 of the Rivers and Harbors Act
Any structure in or over navigable water requires authorization from the U.S. Army Corps of Engineers under Section 10. This covers everything from a floating dock to a commercial pier, along with any work that affects the flow or condition of the waterway.9Office of the Law Revision Counsel. 33 USC 403 – Obstruction of Navigable Waters Generally The statute also prohibits excavating or filling navigable waters without prior approval. Small residential projects like a boat ramp or a retaining wall can trigger the requirement if they touch navigable water.10U.S. Army Corps of Engineers. Section 10 of the Rivers and Harbors Act
Section 404 of the Clean Water Act
A separate permit is required under Section 404 for any project that discharges dredged or fill material into waters of the United States, including wetlands.11Office of the Law Revision Counsel. 33 USC 1344 – Permits for Dredged or Fill Material A permit cannot issue if a less damaging alternative exists or if the project would significantly degrade the aquatic environment.12U.S. Environmental Protection Agency. Permit Program Under CWA Section 404 Routine activities like normal farming and maintaining existing structures are generally exempt.
Penalties for Skipping Permits
Civil penalties for Section 404 violations reach up to $10,000 per day. Willful or negligent violations carry fines between $2,500 and $25,000 per day, up to a year in jail, or both. A second offense doubles the potential prison time and raises the daily fine cap to $50,000.13U.S. Environmental Protection Agency. Overview of Clean Water Act Section 404 The Corps of Engineers can also order you to remove the unpermitted structure and restore the site at your own expense. Before pouring a seawall or extending a dock, confirm whether a permit is required. The permitting process costs time and money; the alternative costs more.