Riparian vs Appropriative Rights
Definition
A riparian right is a right to use the natural flow of a water body on land that touches it. An appropriative right is a right to divert water for use elsewhere or in greater amounts, created by putting the water to beneficial use and ranked by when that began: 'first in time, first in right.' California's State Water Resources Control Board notes that most eastern states recognize riparian rights, most western states recognize only appropriation, and 'California and Oklahoma are the only western states that continue to recognize riparian rights.' In California, appropriative rights begun after 1914 require a state permit and later a license; rights begun before 1914 do not. Riparian holders share equally among themselves and generally rank ahead of appropriators, while appropriators rank among themselves by date, so in a dry year the most recent appropriative rights are curtailed first.
Why it matters
Farmland offerings sometimes say a property has 'water rights' without saying which kind or how senior. In a western drought that difference decides whether the farm receives water. A junior post-1914 appropriative right may be curtailed in most dry years; a riparian right may give nothing once the stream drops; a senior pre-1914 right may hold up. Because riparian rights cannot be sold apart from the land and can be lost on subdivision, a parcel split for a fractional offering can also change what rights come with it. The type and priority of each right belong in the offering documents.
Common misconceptions
- •A riparian right is not a right to store water. It covers natural flow only.
- •Riparian rights do not all rank by date. Riparians share equally among themselves.
- •An appropriative right is not a fixed quantity every year. Junior rights may receive nothing in dry years.
- •A pre-1914 right is not a permit. Its existence and extent rest on historical evidence and, if challenged, the courts.
- •Subdividing land can strip riparian rights from parcels that no longer touch the water.
Technical details
Side by side (California)
Source of the right: riparian, ownership of land touching the water; appropriative, putting water to beneficial use.
Paperwork: riparian, none required (a statement of diversion and use is filed); post-1914 appropriative, permit then license; pre-1914 appropriative, no permit.
Priority: riparians share equally; appropriators rank by date, junior rights curtailed first.
Place of use: riparian, on the riparian parcel draining to the source; appropriative, where the right specifies.
Storage: not under a riparian right; possible under an appropriative right that provides for it.
Loss: riparian, by severance from the land or subdivision; appropriative rights can be lost by non-use under state rules.
Groundwater has its own ranking
The Board says groundwater used on land above the basin is an overlying right; used elsewhere, an appropriative groundwater right.
'Overlying groundwater rights have a higher priority than appropriative groundwater rights.'
The Board permits only subterranean streams in known and definite channels; other groundwater is managed under SGMA.
Questions for a farm with surface water
Which rights does the farm hold, and what is the priority date of each appropriative right?
Have the rights been curtailed in recent droughts, and what was delivered?
Is the farm riparian to a perennial or an ephemeral stream?
Did any subdivision or sale separate rights from the parcel?
How investors apply the term
Investors usually apply this term by tying the definition back to the controlling documents and then asking which cash flows, rights, restrictions, or valuation assumptions it changes. A useful review looks at the term alongside fees, leverage, liquidity, reporting frequency, and manager discretion rather than treating it as a standalone concept.
The practical diligence test is simple: identify who benefits if the assumption is wrong, who has control when conditions change, and what evidence the investor receives after closing. Terms that cannot be reconciled to documents, cash movements, and monitoring data should be treated as marketing shorthand until proven otherwise.
Frequently asked questions
- What can a riparian right be used for?
- Only the natural flow, on the riparian parcel, on land that drains back to the source. The State Water Board says water 'cannot be stored during a wet time for use during a drier time under a riparian right,' cannot include water imported from another watershed, and cannot include releases from an upstream reservoir. Because it covers only natural flow, a riparian right may yield water in wet months and none in dry ones.
- Can a riparian right be lost?
- Yes, though not by non-use. The Board says a riparian right can be lost if land is subdivided so that parts no longer touch the water, unless steps are taken to preserve it, or if the owner sells the land but explicitly separates the right. 'Once it is lost, a riparian right can almost never be restored.' A dormant riparian right can be revived at any time.
- How are appropriative rights ranked?
- By priority date. In a shortage, junior appropriators must stop diverting so that senior holders receive their water. The Board says permits 'recognize that water may only be available in the wettest years and that more recent permitted rights must be curtailed if conditions are dry.'
- Which is better for a farm?
- Neither is better in the abstract. A senior appropriative right with storage can be the most reliable supply in the state; a riparian right on an ephemeral stream may deliver nothing in summer. What matters is the right's priority, the source's reliability in dry years, and whether water can be stored or moved to where it is needed.