California water rights come in several distinct forms, and the one you hold decides how much water you can take, whether you need a state permit, and how fast your supply disappears in a dry year. The main categories are riparian rights tied to streamside land, appropriative rights split by a 1914 cutoff, overlying groundwater rights, and federal reserved rights held by tribes and certain federal lands. The State Water Resources Control Board (SWRCB) regulates surface water and water quality statewide, while local Groundwater Sustainability Agencies manage wells in stressed basins under a 2014 law.1California State Water Resources Control Board. Water Boards Structure
Riparian Rights for Streamside Land
If your parcel borders a natural stream, river, or lake, you hold a riparian right to a share of the water flowing past. The right attaches to the land itself. No permit or license from the state is required.2California State Water Resources Control Board. Water Rights Process
Two limits matter. First, a riparian right covers only the natural flow of the watercourse. You cannot store water in a reservoir for use later in the dry season. Second, the water has to be used on land within the same watershed. Piping it to a parcel outside the watershed boundary is not allowed.
Because riparian rights come with the land, they do not expire from non-use. Riverside acreage that has never been irrigated still carries the right whenever a future owner wants to use it. During shortages, riparian users on the same watercourse share the available flow proportionally rather than by seniority, which makes these rights among the most durable the state recognizes.
Appropriative Rights and the 1914 Dividing Line
Appropriative rights cover water use that is not tied to streamside land ownership. They run on strict seniority: whoever first put the water to beneficial use holds priority over everyone who came after. In a shortage, the most senior holder takes a full allocation before any junior holder gets anything. Priority date is the single most important fact about an appropriative right.
California splits these rights at a historical line. The Water Commission Act, passed in 1913 and effective December 19, 1914, created the modern permitting system and the agency that became today’s SWRCB.3California State Water Resources Control Board. History of the Water Boards – Water Rights Rights established before that date are pre-1914 rights. They sit largely outside the Board’s permitting authority, though holders must still file periodic statements of use. Post-1914 appropriative rights require a formal permit and license from the SWRCB and face far greater regulatory scrutiny. In drought emergencies, junior post-1914 rights are curtailed first.
Five-Year Forfeiture Rule
Unlike a riparian right, an appropriative right can be lost. Under Water Code section 1241, if you fail to put all or part of the water to beneficial use for five consecutive years, the unused portion reverts to the public and becomes unappropriated water available for others to claim.4California State Water Resources Control Board. California Water Code 1240-1244 Conservation is protected: a reduction in use that comes from deliberate conservation efforts does not count against you, because the law treats voluntary conservation as equivalent to beneficial use.
Forfeiture is separate from prescription, a common-law doctrine where another party acquires rights to your water by openly diverting it for an extended period without challenge from you. Either one can strip an appropriative right, so recordkeeping and monitoring of your source matter much more than they do for a riparian holder.
Groundwater Rights and SGMA
Groundwater follows its own rules. If you own land above an aquifer, you hold an overlying right to pump water from it for use on that property. Overlying rights are correlative: every landowner above the basin shares the supply, and during shortages everyone cuts back proportionally rather than one pumper draining the basin at others’ expense.5Eastern Municipal Water District. About California Water Rights
For decades the state left wells largely unregulated. The Sustainable Groundwater Management Act (SGMA), enacted in 2014 and codified beginning at Water Code section 10720, brought the most stressed aquifers under local oversight.6California Legislative Information. California Code Water Code 10720 High- and medium-priority basins are managed by Groundwater Sustainability Agencies (GSAs), formed by local governments through public hearings and joint agreements. GSAs had to be in place by June 30, 2017, and must adopt sustainability plans designed to bring their basins into long-term balance.7California Department of Water Resources. Groundwater Sustainability Agencies
GSAs can monitor wells, impose fees, and restrict pumping if a basin faces permanent damage such as land subsidence. If a GSA fails to adopt or implement an adequate plan, the SWRCB can designate the basin as probationary after a public hearing. Probationary status moves management directly to the state and brings higher oversight costs and tighter pumping limits for every well owner in the area.8California Legislative Information. California Code Water Code 10735.2
The De Minimis Threshold for Domestic Wells
If you pump two acre-feet or less per year for household purposes, SGMA classifies you as a de minimis extractor. One acre-foot generally supplies a family of five for a year, so most private domestic well owners fall below the line. De minimis extractors are not subject to the same reporting and fee requirements that apply to larger pumpers, but they must still comply with the GSA’s broader sustainability plan and any pumping restrictions imposed during emergencies.9State Water Resources Control Board. Sustainable Groundwater Management Act
The Two Ceilings Over Every Right
No water right in California is absolute. Two overarching doctrines limit what any holder can do with their allocation, no matter how senior.
Reasonable and Beneficial Use
Article X, Section 2 of the state constitution requires that all water be put to reasonable and beneficial use, and prohibits waste or unreasonable methods of use. The rule applies equally to the oldest pre-1914 appropriator and the newest permit holder. Practices that an earlier generation accepted can become unreasonable under current drought conditions, and the state can force a change.10Justia. California Constitution Article X Section 2
Beneficial use covers household consumption, crop irrigation, industrial processing, hydropower, and environmental needs such as sustaining fish populations. The SWRCB enforces the reasonable-use requirement through investigations and cease-and-desist orders under Water Code section 1831, and violations of those orders carry penalties of up to $1,000 per day.11California State Water Resources Control Board. Cease and Desist Orders – Water Code Section 1831
The Public Trust Doctrine
The public trust doctrine sits on top of reasonable use. The California Supreme Court’s 1983 decision in National Audubon Society v. Superior Court, the Mono Lake case, held that the state retains ongoing supervisory control over navigable waters and the lands beneath them, and that no party can acquire a vested right to divert water in a way that harms public trust values such as navigation, fisheries, and ecological preservation. The doctrine extends to diversions from nonnavigable tributaries that feed navigable waters, and the SWRCB has a continuing duty to reconsider past allocations if public trust resources are being harmed.12Stanford Law School. National Audubon Society v. Superior Court – 33 Cal. 3d 419 An existing permit is not a guarantee of permanent security if environmental conditions at the source deteriorate.
Drought Curtailments
When stream flows fall below critical thresholds, the SWRCB issues curtailment orders that stop diversions. The orders follow the seniority hierarchy: junior post-1914 rights are curtailed first, and progressively more senior rights follow as conditions worsen. In severe droughts, even pre-1914 rights can face curtailment when minimum environmental or public health flows cannot otherwise be maintained.
A typical order requires every affected right holder to submit a certification form within ten calendar days and to coordinate weekly with the local watermaster or the SWRCB on timing and volume of diversions. Limited exceptions apply to non-consumptive diversions and the minimum amounts needed for human health and livestock watering. Diverting in violation of a curtailment order risks penalties of up to $10,000 per day plus $2,500 for each acre-foot taken illegally.13California State Water Resources Control Board. Shasta River Curtailment Order WR 2024-0006-DWR
Getting a New Surface Water Permit
Anyone who wants to divert surface water under a post-1914 appropriative right has to file an Application to Appropriate Water with the SWRCB. As of 2025, the Board’s new California Water Accounting, Tracking, and Reporting System (CalWATRS) has replaced the older electronic filing systems, though paper filing is still available.14State Water Resources Control Board. Water Rights Applications – Permitting and Licensing Program
The application calls for detailed technical information: the exact source (a named stream, spring, or other watercourse), the precise point of diversion mapped by GPS coordinates or professional survey, the intended purpose and place of use, and the estimated quantity in acre-feet per year or cubic feet per second. The place of use typically requires an assessor’s parcel map showing the water will stay within authorized boundaries. Environmental review under the California Environmental Quality Act (CEQA) is part of the process, which means an assessment of how the diversion could affect wildlife, downstream users, and water quality.
Filing Fees
Application fees are tied to the volume requested and are substantially higher than many applicants expect. The current schedule starts at $5,000 for diversions of less than 10 acre-feet per year and climbs steeply:
- 10 to under 200 acre-feet per year: $40,000
- 200 to under 1,000 acre-feet per year: $43,000
- 1,000 to under 5,000 acre-feet per year: $55,000
- 5,000 to under 10,000 acre-feet per year: $117,000
- 10,000 to under 20,000 acre-feet per year: $192,000 to $266,000
- 20,000 acre-feet per year and above: $341,000 to $811,000
A 20 percent complexity surcharge applies to applications proposing diversions within the Sacramento–San Joaquin Bay Delta watershed or involving an onstream dam in areas covered by the Northern California Coastal Streams instream flow policy.15New York Codes, Rules and Regulations. 23 CCR 1062 – Filing Fees for Water Right Applications
Protests and Board Review
Once the Board accepts an application and fee, it publishes a public notice. Any party who believes the proposed diversion would harm existing rights, damage the environment, or fail to serve the public interest can file a written protest by the deadline set in the notice.16State Water Resources Control Board. Protest Submittal Information If protests are filed and cannot be resolved through negotiation, the Board schedules a formal hearing before deciding whether to issue a permit. The SWRCB does not publish a standard timeline, and contested applications routinely take multiple years to process.
Transferring or Dedicating a Right
Holders of appropriative rights can transfer water to other users or locations with SWRCB approval. Temporary transfers lasting less than one year are governed by Water Code section 1725 and can only involve the amount of water the holder would have actually consumed. The transfer cannot injure other legal users or unreasonably harm fish, wildlife, or other instream uses.17California Legislative Information. California Code Water Code WAT 1725 Long-term transfers exceeding one year require a petition under Water Code section 1735 and a more rigorous review that includes environmental analysis.18California State Water Resources Control Board. Water Transfers Program
Right holders can also dedicate water to environmental purposes under Water Code section 1707. This provision lets any holder, appropriative or riparian, petition the SWRCB to convert a consumptive use into instream flows for fish and wildlife habitat, wetlands, or recreation. The petition pairs with either a standard change petition for permanent conversions or a temporary transfer petition for short-term dedications. The Board approves these only if the change does not create a new right, does not unreasonably affect other users, and serves the public interest.19California Legislative Information. California Code Water Code 1707
What Unauthorized Diversion Costs
Diverting surface water without authorization is treated as a trespass under Water Code section 1052. The SWRCB can impose administrative penalties of up to $1,000 per day for each day of unauthorized diversion. For unlicensed cannabis cultivation, the daily maximum rises to $4,000. These amounts are adjusted periodically for inflation.20New York Codes, Rules and Regulations. 23 CCR 1100 – Water Right Civil Penalties Adjusted for Inflation
The SWRCB can also issue cease-and-desist orders under Water Code section 1831 against anyone violating a permit condition, diverting without authorization, or ignoring a prior Board order. Failure to comply with a cease-and-desist order exposes the violator to penalties of up to $1,000 per day, with court injunctions available if the violations continue. Violating a permit term or failing to meet reporting requirements carries a separate penalty of up to $1,000 per day. The Board starts enforcement by issuing an administrative civil liability complaint under Water Code section 1055, and the respondent has 20 days to request a hearing before the Board can adopt a final penalty order.
Federal Reserved and Tribal Rights
California’s state-law framework does not sit alone on the water. Under the federal Winters doctrine, Native American tribes and certain federal reservations hold water rights with priority dates reaching back to the creation of the reservation or earlier. These federal reserved rights are governed by federal law: they cannot be forfeited through non-use, and they cover both consumptive uses such as irrigation and non-consumptive uses such as maintaining instream flows. Quantification typically happens through state court adjudications, but the legal standards are federal, not California’s beneficial use framework. In basins where federal reserved rights exist, those claims can significantly reduce the water available to state-law appropriators, especially in dry years when the reserved rights’ early priority dates place them at the top of the seniority stack.