Riparian and littoral rights are the two kinds of water rights that come with waterfront property, and which one you hold depends on the type of water at your lot line. Riparian rights attach to land along flowing water, such as rivers, streams, and creeks. Littoral rights attach to land along relatively still or tidal water, such as lakes, ponds, and oceans. The distinction is not just vocabulary. It controls where your property actually ends, what you can draw from the water, what you can build, and what transfers to you at closing.
What Riparian Rights Give You
If your property borders a river, stream, or creek, you hold riparian rights. The traditional eastern doctrine ties the right to the water directly to ownership of the bordering land. You can draw water for household use, irrigation, and other purposes, but you cannot monopolize the supply or spoil it for the people downstream. The governing principle is reasonable use: each owner along the waterway shares the resource without unreasonably harming anyone else’s access or the watercourse itself.
An older version of the doctrine, called natural flow, required riparian owners to leave the stream essentially untouched. Most jurisdictions have replaced that rigid standard with the reasonable use approach, which allows meaningful consumption so long as it does not significantly diminish the water’s quantity or quality for other users. Damming a stream and drying out a neighbor’s land, or dumping waste that fouls the water downstream, exposes you to civil liability and court orders to stop.
Western states operate on a fundamentally different system called prior appropriation, where water rights are not tied to land ownership at all. Whoever first puts the water to a beneficial use holds the senior right, regardless of whether they own property along the water’s edge.1Division of Water Resources. Water Rights A rancher who diverted water in 1890 outranks a homeowner who bought riverfront last year. About nine western states follow pure prior appropriation, and roughly a dozen more use a hybrid system blending both doctrines. If you are buying waterfront property anywhere west of the Mississippi, investigating which system governs is not optional.
What Littoral Rights Give You
Properties bordering lakes, ponds, and oceans carry littoral rights rather than riparian ones. The practical differences show up at the boundary. Along tidal waters, private ownership generally ends at the mean high water line, which is calculated by averaging high tide elevations over an 18.6-year cycle to account for tidal variations.2U.S. Government Publishing Office. The Use and Legal Significance of the Mean High Water Line in Coastal Boundary Mapping Everything below that line typically belongs to the state or the public.
This public ownership of the foreshore traces to the public trust doctrine, a common law principle holding that the government manages navigable waters and submerged lands for the benefit of everyone. The state cannot simply sell off a lake bed or tidal flat to a private buyer. As a littoral owner, you enjoy the view, the right to reach the water from your property, and (in most places) the right to build a dock, but you do not own the water itself or the land beneath it.
Littoral owners on non-tidal lakes face a different boundary question. Some jurisdictions extend private ownership to the water’s edge at normal pool level; others extend it to the center of the lake bed, depending on whether the lake is legally navigable. The variation is significant enough that a professional boundary survey is worth the cost before buying lakefront property or building near the shore.
Where Your Property Actually Ends
The single most important legal question for any waterfront parcel is whether the adjacent water is classified as navigable. That classification determines who owns the submerged land and where your property line falls. The test comes from an 1870 Supreme Court case: a body of water is legally navigable if it is capable of being used, in its ordinary condition, as a highway for commerce.3Justia U.S. Supreme Court Center. The Daniel Ball, 77 U.S. 557 (1870) This replaced the older English rule that treated only tidal waters as navigable.4Environmental Protection Agency. Legal Definition of Traditional Navigable Waters
If the water is navigable, the state owns the submerged land beneath it, and your property line stops at the ordinary high water mark for inland waters or the mean high water line for tidal waters. This state ownership comes from the equal footing doctrine: when each state joined the Union, it automatically received title to the beds beneath navigable and tidally influenced waters within its borders.5Constitution Annotated. Equal Footing and Property Rights in Submerged Lands States then allocate and govern those lands under state law, though the federal government retains authority over navigation for interstate commerce.
If the water is non-navigable, the picture changes considerably. Under the common law doctrine of ad medium filum aquae, your boundary extends to the center of the stream or water bed. Own both banks of a small creek and you own the entire creek bed. You have far more control over the water and the land beneath it, though you still cannot use the water in ways that harm other owners along the same waterway.
Getting this boundary wrong has real consequences. Building a fence or structure past the actual property line onto state-owned submerged land can lead to trespass claims, mandatory removal at your expense, and fines from environmental regulators. A survey by a licensed professional familiar with waterfront boundaries is the only reliable way to pin down exactly where your lot ends.
When the Shoreline Moves
Waterfront boundaries are not permanent. Rivers meander, lakes recede, and storms reshape coastlines. The law treats gradual changes very differently from sudden ones, and the distinction directly affects who owns what.
Accretion is the slow, natural buildup of land along a waterfront through deposited sediment. When your shoreline gains ground gradually, the new land belongs to you and your boundary shifts with it. The Supreme Court established this clearly: when a property border follows running water and the banks change through gradual accretion, the boundary moves with the stream.6Library of Congress. Nebraska v. Iowa, 143 U.S. 359 (1892) You end up with more land without buying it.
Erosion works the same way in reverse. If the water slowly eats away at your shoreline, your boundary retreats with it, and you lose the land permanently. There is no compensation for naturally eroded waterfront, one of the less pleasant realities of owning along a dynamic shoreline.
Avulsion is a sudden, dramatic change, like a flood that carves a new river channel overnight. When that happens, the property boundary stays where it was before the event, in the center of the old channel. The logic is practical: gradual changes are imperceptible day to day, so moving the boundary avoids the impossible task of pinpointing when each inch shifted, while a sudden change can be clearly identified and the old boundary preserved.6Library of Congress. Nebraska v. Iowa, 143 U.S. 359 (1892)
Reliction is related: when a body of water permanently recedes and exposes new dry land, the riparian or littoral owner gains title to that exposed ground, provided the recession is natural and permanent. If someone artificially drains a lake, the exposed lake bed does not become the adjoining owner’s property.
What You Can and Cannot Do With the Water
Waterfront ownership gives you the right to physically access the water from your property, swim, boat, fish, and draw water for household purposes like drinking and garden irrigation. Most jurisdictions treat these domestic uses as inherent to the property and require no special permission, so long as the volume stays within reasonable household levels.
Building waterfront structures is where the rules tighten. You generally have the right to build a dock, pier, or boat ramp to reach navigable depth, sometimes called the right of wharfing out. But that right is not unlimited. Nearly every jurisdiction requires permits for structures that extend into or over the water, and federal law adds its own requirements. Section 10 of the Rivers and Harbors Act of 1899 makes it unlawful to build any structure in or over navigable waters without authorization from the U.S. Army Corps of Engineers, covering everything from small floating docks to piers, bulkheads, boat ramps, and intake pipes.7Office of the Law Revision Counsel. 33 USC 403 – Obstruction of Navigable Waters Generally Section 404 of the Clean Water Act adds a separate requirement for projects that discharge dredged or fill material into waters of the United States, including wetlands.8US EPA. Permit Program Under CWA Section 404 Building without the required permits is one of the fastest ways to end up tearing a structure down at your own cost.
Obstructing navigation on a public waterway is illegal. You cannot stretch a cable across a river, build a dock that blocks boat traffic, or fence off a navigable channel. Large-scale water diversions, dams, and anything that significantly alters the flow of a stream require administrative approval, and proceeding without it brings substantial penalties.
Water quality carries the sharpest teeth. Discharging pollutants into navigable waters triggers enforcement under the Clean Water Act. Civil penalties for violations reach up to $68,445 per day for each violation under current inflation-adjusted schedules.9eCFR. 40 CFR 19.4 – Statutory Civil Monetary Penalties, as Adjusted Criminal penalties for knowing violations can include imprisonment alongside daily fines.10US EPA. Criminal Provisions of Water Pollution Even seemingly minor actions like dumping yard waste or allowing fuel runoff from a boat dock can create liability.
How These Rights Transfer With the Property
In most of the country, riparian and littoral rights are appurtenant to the land, meaning they automatically transfer to the new owner when the property changes hands. You do not need a separate contract to acquire the right to access the river behind your new house. The deed conveys the land, and the water rights come with it.
The exception matters enormously. In some jurisdictions, water rights can be legally severed from the property and sold or retained separately. This is most common in western prior appropriation states where water is scarce enough that the rights alone may exceed the land’s value. If a previous owner severed the water rights and sold them to a third party, you could buy a house on a riverbank and have no legal right to use the water flowing past it.
Before closing on waterfront property, verify that the deed includes the water rights, check for any recorded instruments that severed or transferred those rights to someone else, and confirm whether any government adjudication has defined or limited the property’s water entitlements. In prior appropriation states, water rights are typically documented through state administrative systems, and a title search alone may not reveal their status. Contact the state’s water resources agency directly. In some western watersheds, the federal government participates in large-scale adjudication proceedings that settle competing claims across an entire river system, and under the McCarran Amendment the federal government can be joined as a party in state court water rights adjudications.11Office of the Law Revision Counsel. 43 USC 666 – Suits for Adjudication of Water Rights Buying property in a basin undergoing active adjudication adds uncertainty, because the final decree may redefine the water rights you thought you were purchasing.