Hemp cultivation in California sits at the intersection of CDFA regulatory compliance, county agricultural zoning, Williamson Act contract obligations, State Water Board permitting, and federal Farm Bill requirements — a regulatory framework that is entirely separate from the DCC cannabis licensing system and that has evolved significantly since the 2018 federal legalization of hemp. The Law Office of Shay Aaron Gilmore guides hemp cultivators, agricultural landowners, and investors through CDFA Industrial Hemp Program registration, county agricultural commissioner requirements, zoning compliance, Williamson Act analysis, and water rights and environmental compliance across California’s diverse agricultural regions.
The firm serves cultivators, distributors, manufacturers, testing labs, retailers, investors, landowners, and management companies operating in both cannabis and hemp markets, providing coordinated advice for the growing number of dual-license operators holding DCC cannabis licenses and CDFA hemp registrations simultaneously. Ranked Band 4 in Cannabis Law: Western United States by Chambers and Partners, named as one of the Top 20 Cannabis Lawyers in California by the Los Angeles / San Francisco Daily Journal, and listed among the Top 100 Lawyers in Northern California by Super Lawyers® Magazine, Shay Aaron Gilmore serves as a Board Member of both the International Cannabis Bar Association (INCBA) and California NORML.
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CDFA Industrial Hemp Registration: What California Cultivators Need to Know
CDFA Registration Requirements.
A complete CDFA grower registration requires:
- A completed application submitted through the CDFA’s online portal
- GPS coordinates identifying the precise location and boundaries of the cultivation site
- Identification of the hemp variety or varieties to be cultivated, including documentation that the variety is on the USDA’s approved hemp seed list or that THC testing at or below 0.3% has been established
- Payment of the $900 annual registration fee
- A criminal history report for all “key participants” — defined as sole proprietors, general partners, executive officers, and persons who direct management and policy decisions
County Agricultural Commissioner Requirements.
Annual Renewal.
THC Testing and Compliance.
All hemp cultivators must arrange for pre-harvest THC testing of each lot by a USDA-approved laboratory. Any lot testing above the federal limit (0.3% delta-9 THC on a dry weight basis through December 10, 2026; 0.3% total THC, including THCA, beginning December 11, 2026) is considered “hot” cannabis — not hemp — and is subject to destruction. Cultivators must maintain records of all testing and sampling and make them available to the CDFA and county agricultural commissioner on request.
Agricultural Land Use and the Williamson Act
Is Hemp Cultivation Compatible with Williamson Act Land?
When Compatibility Determinations Are Required.
Proposed uses that go beyond simple field cultivation may require a formal compatibility determination from the county board of supervisors before proceeding:
- On-site hemp processing facilities or extraction operations
- Storage or warehouse facilities not incidental to cultivation
- Employee housing on the agricultural parcel
- Infrastructure improvements not typically associated with open-field cultivation
Cancellation Risks.
A landowner who proposes a use that a county determines is incompatible with the Williamson Act contract — or who proceeds with an incompatible use without a compatibility determination — risks Williamson Act contract cancellation. Cancellation triggers a penalty equal to 12.5% of the full fair-market value of the land, paid over nine years. For high-value agricultural parcels in premium hemp-growing regions, the cancellation penalty can be substantial.
Non-Renewal vs. Cancellation.
For land use issues related to cannabis (rather than hemp) on agricultural parcels, see Cannabis Zoning & Conditional Use Permits. For CDFA and DCC regulatory compliance across both hemp and cannabis programs, see Regulatory Compliance.
Cannabis vs. Hemp: Land Use and Regulatory Framework
| Cannabis | Hemp | |
|---|---|---|
| Regulator | Department of Cannabis Control | CA Dept. of Food and Agriculture |
| Registration/Licensing | State annual license (DCC) + local permit | CDFA state registration + county ag commissioner registration |
| Zoning | Industrial, commercial, or cannabis-specific zones in most jurisdictions | Agricultural zones (A-1, A-2, AG, etc.) — hemp is an agricultural crop |
| Local ban authority | Yes — jurisdictions may ban commercial cannabis entirely | Limited — municipalities generally cannot ban agricultural cultivation |
| Sensitive use setbacks | Yes — 600 ft. from schools minimum; local ordinances often higher | Not applicable |
| Williamson Act | Generally incompatible with cannabis cultivation on Williamson Act land | Generally compatible — hemp is an agricultural crop |
| CEQA | Required for all new CUP applications | May apply to large-scale operations; categorical exemptions available |
| Water rights | SWRCB permits may be required for water diversion | SWRCB permits may be required for water diversion |
| Pre-harvest testing | Not required (post-harvest testing for product compliance) | Required for THC compliance — lots above 0.3% THC must be destroyed |
| Annual registration fee | Varies by license type (hundreds to thousands of dollars) | $900 flat fee |
| Co-location with cannabis | FAC §81006 restricts hemp on DCC-licensed cannabis premises without DCC approval | Hemp cultivation on premises that overlap with a DCC cannabis license requires DCC authorization |
For supply chain contracting for hemp cultivation and processing operations, see Commercial Contracts. For hemp business entity formation and CDFA regulatory compliance, see Corporate Law and Regulatory Compliance.
Representative Matters
- Guided an agricultural landowner in the San Joaquin Valley through CDFA hemp registration, county agricultural commissioner registration, and a Williamson Act compatibility determination for proposed on-site hemp processing infrastructure on Williamson Act-enrolled farmland
- Advised a prospective dual-license hemp and cannabis cultivator in the North Coast region on coordinating CDFA hemp registration and DCC cultivation license requirements for an operation spanning two adjacent parcels — one enrolled in the Williamson Act and one outside the program — and on the FAC §81006 same-premises analysis
- Assisted a San Joaquin Valley hemp cultivator whose lot tested above 0.3% THC on a pre-harvest CDFA test, coordinating with the CDFA and county agricultural commissioner to document the required lot destruction and preserve the cultivator’s registration in good standing for the following growing season
Frequently Asked Questions
Yes. Under the California Industrial Hemp Program, all hemp cultivators must register with the CDFA before planting. Registration requires a completed application, GPS coordinates for the cultivation site, hemp variety identification, a $900 annual fee, and criminal history reports for all key participants. County agricultural commissioner registration is also required. Cultivating without a valid registration can result in the cultivation being classified as illegal cannabis, subject to law enforcement action.
Hemp cultivation is generally compatible with Williamson Act agricultural use restrictions, and most counties do not require a formal compatibility determination for field hemp cultivation alone. However, proposed processing facilities, non-agricultural structures, or significant infrastructure improvements on Williamson Act land may require a county compatibility determination before construction proceeds. Landowners who proceed with incompatible uses without a determination risk Williamson Act contract cancellation, which triggers a penalty of 12.5% of full fair-market land value paid over nine years.
Cultivators diverting water from streams, rivers, or groundwater sources may need a permit or license from the State Water Resources Control Board. Cultivators with pre-1914 appropriative rights or riparian rights may have existing entitlements but must confirm the scope of those entitlements for a new cultivation use. The SWRCB and regional water quality control boards also regulate agricultural discharges. Any new hemp cultivation site requires a site-specific water rights and discharge analysis before operations begin.
On-site hemp processing is permitted but typically requires separate land use approvals — including use permits or conditional use permits under county zoning codes — beyond those needed for cultivation alone. CDFA regulates hemp processors separately from cultivators, and a separate processor registration is required for on-site extraction and manufacturing. Extraction operations involving flammable solvents may also require fire department approval and fire code compliance. For Williamson Act-enrolled properties, on-site processing may require a compatibility determination.
California hemp is regulated under the CDFA’s California Industrial Hemp Program pursuant to California’s USDA-approved State Regulatory Plan for Hemp Production under the 2018 federal Farm Bill. Under federal law, hemp is Cannabis sativa L. with a delta-9 THC concentration of not more than 0.3% on a dry weight basis through December 10, 2026; beginning December 11, 2026, the limit is measured as total THC, including THCA (CRS, IF13136). The amended federal definition also expressly includes industrial hemp grown for fiber, grain, seed oil, and other non-cannabinoid uses. California’s state plan includes requirements that go beyond federal minimum standards. Both state and federal law apply to California hemp cultivators, and the regulatory landscape continues to evolve as federal and state hemp regulations are revised.
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