California Water Rights for Vineyards: Riparian vs Appropriative
California recognizes two main kinds of surface water rights: riparian rights, which come with land that touches a stream and need no permit, and appropriative rights, which since 1914 have required a permit and license from the State Water Resources Control Board, with older pre-1914 rights grandfathered. Pumping percolating groundwater from a well is not part of that permit system at all; counties and groundwater sustainability agencies regulate wells. For a vineyard buyer, the job is to match every creek pump, pond and spring on the property to a valid right and to the annual reports that keep it in good standing.
This guide explains how each right works, what transfers with the land, what the state’s water rights database shows, and the red flags we look for in a seller’s water file in Napa, Sonoma, Mendocino and Lake counties. Well permits and basin fees are covered separately in our guide to Sonoma County groundwater rules.
Which water source falls under which rules
Most vineyard properties combine more than one source, and each one answers to a different set of rules.
| Source on the property | Usual basis of right | Who oversees it |
|---|---|---|
| Pump drawing directly from a creek or river | Riparian, pre-1914 appropriative, or a post-1914 permit or license | State Water Board, Division of Water Rights |
| Pond or reservoir filled from a stream in winter | Appropriative right to storage (permit, license or registration); riparian rights do not cover storage | State Water Board; dam safety and county grading rules may also apply |
| Spring | Depends on whether it flows off the property; small springs may be exempt from reporting | State Water Board |
| Well pumping percolating groundwater | Overlying landowner’s right; no state water right permit | County well permits; a groundwater sustainability agency in managed basins |
| Well in a known subterranean stream | Treated like surface water for reporting | State Water Board |
Riparian rights: tied to land along the stream
The State Water Board describes a riparian right as entitling the landowner to use a correlative share of the water flowing past the property. These rights usually come with owning a parcel adjacent to a source of water, and they need no permit, license or government approval.
The limits are what matter on a vineyard:
- Natural flow only. A riparian right covers water that would naturally flow in the stream. It does not allow diverting water to storage for use in the dry season, and it does not allow use on land outside the watershed.
- Shared shortages. Riparian holders generally share a shortage among themselves in a drought, and as a class they have higher priority than appropriators.
- Stays with the land, until it doesn’t. The right remains with the property when it is sold, but parcels severed from the adjacent water source generally lose it. A lot split or boundary change that cuts a block off from the creek can cost that block its riparian water.
- Reasonable use. Article X, section 2 of the California Constitution requires every water use to be reasonable and beneficial.
The storage limit is the one that catches buyers. A winter-filled frost or irrigation pond is storage, so a riparian right alone does not support it. Our guide to vineyard ponds and reservoirs covers the physical and permit side of ponds.
Appropriative rights: permits, licenses and priority
Before 1914, people generally took water without formal permission, sometimes posting or recording a notice with the county recorder. The Water Commission Act of 1914 created the permit process now administered by the State Water Board, and post-1914 rights carry the priority of the date the application was filed.
- First in time, first in right. In a shortage, the most junior appropriator must stop first.
- Permit, then license. A permit lets the project be built and the water put to use; once the project is complete and the water fully used, the Board issues a license, which lasts as long as its conditions are met and beneficial use continues.
- Use it or risk losing it. Under Water Code section 1241, water a holder fails to use beneficially for five years may revert to the public, on a Board finding after notice, with a hearing if the holder asks for one.
- Pre-1914 claims need proof. Because no permit exists, the claim rests on historical evidence of diversion and continuous use. Ask the seller what that evidence is.
Registrations for small projects
Since 1989, the Board has offered registrations as a faster way to obtain an appropriative right for small projects. Water Code section 1228.1 sets the limits:
| Registration | Limit |
|---|---|
| Small domestic use | Direct diversion of up to 4,500 gallons per day, or storage of up to 10 acre-feet per year |
| Small irrigation use | Storage of up to 20 acre-feet per year for irrigation, heat control or frost protection; or direct diversion of up to 42,000 gallons per day, to a maximum of 20 acre-feet per year |
| Livestock stockpond | Direct diversion of up to 4,500 gallons per day, or storage of up to 10 acre-feet per year |
Registration certificates must be renewed every five years and are revoked by operation of law if fees are not paid or annual reporting is not substantially completed. The Board also warns that an existing pond or pump does not by itself establish a right.
Annual reports and the state’s water rights database
Under Water Code section 5101, anyone who diverts surface water, or pumps from a known subterranean stream, after 1965 must file a Statement of Water Diversion and Use, unless an exemption applies. Exemptions include diversions covered by a permit, license, registration or stockpond certificate on file with the Board, which have their own reporting, and diversions from a spring that does not flow off the property and totals 25 acre-feet a year or less.
- Supplemental statements are due each year before February 1 for the prior year’s diversions.
- Failing to file can bring a fine of up to $1,000, plus $500 a day if the violation continues more than 30 days after notice from the Board.
- Diverters who file statements must also measure their diversions under Senate Bill 88 and the Board’s measurement regulation.
The Board’s old eWRIMS database has closed. Its replacement, CalWATRS, was introduced in October 2025 with about 40,000 water right records and an interactive map by stream, watershed, water district and parcel. Owners and agents need a CalWATRS account to file; the Board mailed access PINs to primary owners and agents in October and November 2025, and old eWRIMS logins do not work. For the 2025 reporting year the deadline was January 31, 2026, with a grace period to March 2, 2026.
When a property changes hands, ask the seller to help update the owner of record with the Division of Water Rights; the Board’s statement program uses a change form for new owners and contacts, now moving to a web form. Put it on the closing checklist so the new owner, not the seller, receives the next reporting notice.
Frost protection in the Russian River watershed
Spring frost protection is a distinct issue in the Russian River watershed. Under California Code of Regulations, title 23, section 862, diversions from the Russian River stream system for frost protection from March 15 through May 15 must follow a Board-approved water demand management program. The rule covers Sonoma and Mendocino counties, excluding diversions upstream of Warm Springs Dam and Coyote Dam.
It also reaches groundwater pumping that is hydraulically connected to the stream system, meaning pumping that reduces the stage of any surface stream in the watershed during a frost event. So a well used for frost protection can be covered even though wells otherwise sit outside the state permit system. The section became operative December 29, 2011.
For a vineyard in this area, ask which water demand management program the property belongs to, what its frost protection plan says, and whether the seller’s records show compliance. Our Russian River Valley vineyard guide covers the appellation itself.
Groundwater, SGMA and the county layer
The State Water Board says California has no state permit process for groundwater use; in most areas, overlying landowners may pump percolating groundwater for reasonable, beneficial use without Board or court approval. In some basins, court decrees adjudicate groundwater rights instead.
Under the Sustainable Groundwater Management Act, Sonoma County’s three medium-priority basins, the Santa Rosa Plain, Sonoma Valley and Petaluma Valley, each have a groundwater sustainability agency. The Santa Rosa Plain agency says SGMA and its plans do not affect surface or groundwater rights (Water Code section 10720.5), though an agency could limit pumping by well owners who pump more than 2 acre-feet a year.
Well permits, the county’s public trust review area and basin fees are explained in our Sonoma County well and groundwater guide. Napa has its own system, covered in our guide to Napa groundwater rules. Where recycled water is available, it can reduce demand on both; see recycled water for vineyards.
Reviewing a seller’s water file
- List every point of diversion. Walk the property with a map of pumps, intakes, ponds, springs and wells.
- Match each one to a right. Look up the parcel and the stream in CalWATRS, and ask for copies of permits, licenses, registrations, statements and any pre-1914 evidence.
- Check the reporting history. Confirm statements or annual reports were filed each year, and that measurement devices are installed.
- Compare paper to practice. A license’s season, place of use and quantity should match how the vineyard is actually farmed.
- Check boundaries. Confirm the parcels relying on a riparian right still touch the stream.
- Look for enforcement. Ask about curtailment orders, complaints or notices from the Board.
- Write the contingency to fit. Allow time for a water rights attorney or consultant to review the file before you remove contingencies.
Red flags include a pond with no storage right, a statement that stopped being filed years ago, a license whose place of use doesn’t include the planted blocks, and a parcel split that left part of the vineyard without frontage. Each one affects what the vineyard can produce and what it is worth; our vineyard valuation guide explains why, and the full checklist is in vineyard due diligence.
For sellers: assemble the file before listing
A complete water file answers a buyer’s first questions and supports the price. Gather permits, licenses, registrations, statements and annual reports, measurement records, any frost protection program enrollment, pond and dam documents, and well records. If reports are behind, talk to a consultant about bringing them current before the property goes on the market. Our guide to selling a vineyard covers the rest of the preparation, and vineyard development explains how water supports new plantings.
This is general information, not legal advice; talk to a California water rights attorney or water rights consultant about a specific property.
Questions people ask
Do riparian water rights transfer when I buy the land?
Generally yes. The State Water Board says riparian rights remain with the property when it changes hands, but parcels severed from the adjacent water source generally lose them.
Can I fill a pond under a riparian right?
No. Riparian rights do not allow diverting water to storage for use in a later season, so a winter-filled pond needs an appropriative right, such as a permit, license or registration.
Do I need a water right for my well?
Not from the State Water Board for percolating groundwater, which overlying landowners may pump for reasonable, beneficial use. Wells still need county permits and may be subject to a groundwater sustainability agency, and pumping from a known subterranean stream is reported like surface water.
Can a water right be lost?
An appropriative right can. Under Water Code section 1241, water not put to beneficial use for five years may revert to the public after a Board finding with notice. Registrations are also revoked if fees or annual reports lapse.
Where do I look up California water rights now that eWRIMS is closed?
In CalWATRS, the State Water Board’s replacement system, introduced in October 2025, which includes an interactive map of water rights by stream, watershed, water district and parcel.
When are diversion reports due?
Supplemental Statements of Diversion and Use are due each year before February 1. Failing to file can bring a $1,000 fine plus $500 a day if it continues more than 30 days after notice.
Does the frost protection rule apply to wells?
In the Russian River watershed it can. Section 862 covers groundwater pumping that is hydraulically connected to the stream system during frost season, March 15 through May 15.
If you are looking at a creekside vineyard or ranch, we can help you assemble the water file early and line up the right specialists. Explore our vineyard and winery services, read our guide to buying a vineyard, or contact Diamond Real Estate Group.
Sources & notes
- State Water Resources Control Board: The water rights process
- State Water Resources Control Board: Statement of Water Diversion and Use Program
- State Water Resources Control Board: eWRIMS and CalWATRS
- State Water Resources Control Board: CalWATRS press release (Oct. 23, 2025)
- State Water Resources Control Board: Registrations
- California Public Law: Water Code section 1228.1
- California Public Law: Water Code section 1241
- Cornell Legal Information Institute: Cal. Code Regs. tit. 23, section 862
- Santa Rosa Plain Groundwater Sustainability Agency: FAQs
Last reviewed October 2026 by Matthew Martinez.
