Mandatory Livestock Disease Reporting in California: CDFA Rules, Timelines, and Enforcement

California is home to one of the largest and most diverse agricultural economies in the United States, and protecting that economy starts with early disease detection. When a reportable condition spreads unchecked through a livestock operation, the consequences can reach far beyond a single farm — threatening regional herds, trade relationships, and public health.

If you own, manage, or provide veterinary care for livestock in California, understanding your reporting obligations under state law is not optional. This guide walks you through exactly which diseases must be reported, who carries the legal duty to report, what signs should prompt immediate action, and what happens — both after you report and if you fail to do so.

Pro Tip: Bookmark the California Department of Food and Agriculture (CDFA) Animal Health Branch contact page before you need it. Having the number ready can make a critical difference when time-sensitive reporting windows open.

Reportable Livestock Diseases in California

California maintains a formal list of reportable animal conditions governed by the California Food and Agricultural Code (FAC) and Title 3 of the California Code of Regulations (CCR), Section 797. These regulations identify diseases that pose a significant risk to animal populations, agricultural commerce, or human health — and they require prompt notification to state authorities when suspected or confirmed.

The diseases covered span multiple livestock species, including cattle, swine, poultry, sheep, goats, horses, and exotic or zoo animals. Broadly, they fall into two tiers: immediately reportable diseases and those requiring reporting within a defined window.

Immediately reportable diseases — those requiring contact with the CDFA Animal Health Branch (AHB) as soon as a suspicion arises — include some of the most economically devastating conditions known to agriculture. These include:

• Foot-and-mouth disease (FMD)
• Highly pathogenic avian influenza (HPAI)
• African swine fever
• Classical swine fever (hog cholera)
• Bovine spongiform encephalopathy (BSE)
• Vesicular stomatitis
• Exotic Newcastle disease
• Rinderpest
• Contagious bovine pleuropneumonia
• Anthrax
• Brucellosis (all species)
• Tuberculosis (bovine and avian)
• Scrapie
• Pseudorabies

A second category covers diseases reportable within 24 to 72 hours of diagnosis or suspicion. These include conditions such as equine infectious anemia, anaplasmosis, bluetongue, pullorum disease, and others identified under CCR Title 3. The full regulatory list is updated periodically, and producers should consult the CDFA’s official reportable conditions list to ensure they are working from the most current version.

It is also worth noting that California’s list includes several conditions that qualify as zoonotic diseases — illnesses transmissible from animals to humans. Brucellosis and anthrax, for example, carry human health implications that extend the urgency of reporting well beyond livestock protection alone. Understanding common bovine diseases is a useful baseline for cattle producers navigating these requirements.

Key Insight: California’s reportable disease list is not static. Regulatory amendments can add or reclassify conditions, so verifying the current list through the CDFA or a licensed veterinarian at least once per year is a sound practice for any livestock operation.

Who Is Required to Report a Livestock Disease in California

California law places the reporting obligation on multiple parties — not just veterinarians. Under FAC Section 9101 and related provisions, the duty to report extends to anyone who knows of or reasonably suspects the presence of a reportable condition in an animal under their care or custody.

The following individuals and entities carry a legal reporting obligation in California:

• Licensed veterinarians — including private practitioners, large-animal vets, and those working in research or institutional settings
• Livestock owners and operators — anyone who owns, possesses, or controls animals on a farm, ranch, feedlot, or similar facility
• Farm managers and employees — individuals responsible for the daily care or supervision of livestock
• Livestock dealers and transporters — those who move animals through commerce or across state lines
• Slaughterhouse and rendering facility operators — who may encounter disease signs post-mortem
• Diagnostic laboratory directors — when a laboratory test confirms or suggests a reportable condition

Veterinarians carry a particularly heightened duty under California’s veterinary practice regulations. A licensed vet who diagnoses or suspects a reportable disease and fails to notify the CDFA AHB faces both professional disciplinary consequences and potential criminal liability. That said, producers should not assume that a veterinarian’s report relieves them of their own independent obligation — both parties may be required to report simultaneously.

Important Note: If you are unsure whether a condition qualifies as reportable, California regulations generally require you to report anyway. Reporting a suspected condition that turns out to be non-reportable carries no penalty. Failing to report a confirmed reportable disease does.

If your animals are managed by a contracted farm manager or a veterinary service, it is wise to establish in writing who bears primary responsibility for disease reporting. Contractual clarity does not eliminate your legal obligation, but it ensures that someone is actively monitoring and acting on your behalf.

Signs and Symptoms That Trigger a Report in California

You do not need a confirmed laboratory diagnosis to trigger a reporting obligation in California. Suspicion alone — based on clinical signs consistent with a reportable disease — is sufficient and, in many cases, legally required to initiate contact with the CDFA AHB.

Knowing which symptoms should raise immediate concern is a practical skill for any livestock producer or caretaker. The following clinical presentations are among the most significant red flags across common livestock species:

Cattle and small ruminants:

• Vesicles (fluid-filled blisters) on the mouth, tongue, feet, or teats — a hallmark sign of foot-and-mouth disease and vesicular stomatitis
• Sudden, unexplained death in multiple animals within a short period
• Severe neurological signs, including circling, tremors, or inability to stand
• Rapid weight loss combined with progressive neurological deterioration (consistent with BSE or scrapie)
• Swollen lymph nodes, fever, and nasal discharge suggestive of brucellosis or tuberculosis

Swine:

• High fever, skin hemorrhaging, and sudden death — consistent with African swine fever or classical swine fever
• Vesicular lesions on the snout, feet, or mouth
• Neurological signs in piglets, including paddling or seizures

Poultry:

• Sudden, high-mortality die-offs across a flock
• Respiratory distress, swollen heads, or cyanotic (bluish) combs — signs associated with highly pathogenic avian influenza and exotic Newcastle disease
• Dramatic drop in egg production without clear nutritional or environmental cause

Equine:

• Vesicular lesions on the lips, tongue, or coronary bands
• Unexplained anemia or jaundice (associated with equine infectious anemia)
• Encephalitic signs such as head pressing, blindness, or inability to swallow

Common Mistake: Many producers wait for laboratory confirmation before calling the CDFA. This can cost critical hours during a fast-moving outbreak. If clinical signs are consistent with a reportable disease, make the call first and confirm the diagnosis second.

For producers managing bird species beyond traditional poultry, understanding the broader landscape of diseases that affect birds can help sharpen your ability to recognize unusual presentations early. Similarly, producers with mixed operations that include dogs or companion animals should be aware of how pigeon diseases and other avian conditions can interact with broader flock health.

How to Report a Livestock Disease in California

Reporting a suspected or confirmed livestock disease in California follows a clear procedural path. The primary point of contact is the CDFA Animal Health Branch, which operates district offices throughout the state and maintains a 24-hour emergency reporting line for immediately reportable conditions.

Here is the step-by-step process for making a report:

1. Identify the concern. Document the clinical signs you are observing, the number of animals affected, the species involved, and the approximate timeline of symptom onset. Photographs or video can be valuable supporting evidence.
2. Contact your local CDFA district veterinarian. California is divided into animal health districts, each staffed by CDFA veterinary personnel. Your district veterinarian is typically your first point of contact for non-emergency reportable diseases. Contact information for each district is available through the CDFA Animal Health Branch.
3. Use the 24-hour emergency line for immediately reportable diseases. For diseases on the immediate notification list — such as FMD, HPAI, or African swine fever — do not wait for business hours. The CDFA AHB emergency line is available around the clock.
4. Notify your private veterinarian simultaneously. If you have a veterinarian of record for your operation, contact them at the same time you contact the CDFA. Their clinical assessment will support the state investigation and may be required as part of the formal reporting process.
5. Cooperate with state veterinary investigators. Once a report is filed, CDFA personnel will typically request access to your premises for a field investigation. Cooperation at this stage is both legally required and practically important for limiting disease spread.
6. Maintain records of your report. Document the date, time, method of contact, and the name of the CDFA official you spoke with. This record protects you if questions arise later about reporting compliance.

In some cases, the CDFA may coordinate with the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS), particularly when a foreign animal disease is suspected or when federal indemnity programs may be triggered. The USDA APHIS reportable disease program operates in parallel with state reporting systems for certain high-consequence conditions.

Pro Tip: Keep a laminated emergency contact card posted in your barn or feed room with the CDFA AHB district office number, the 24-hour emergency line, and your private veterinarian’s after-hours contact. Seconds matter during a disease emergency.

Reporting Deadlines and Timeframes in California

California’s reporting requirements are not uniform across all diseases — the urgency of notification scales with the severity and transmissibility of the condition. Understanding these tiers helps you respond appropriately without delay.

The clock on these deadlines begins when you first have reason to suspect a reportable condition — not when laboratory results arrive. This is a critical distinction. If clinical signs are strongly suggestive of a Tier 1 disease, waiting for diagnostic confirmation before calling is a regulatory violation, regardless of the final test outcome.

For Tier 2 and Tier 3 conditions, the 24- and 72-hour windows are measured from the point of diagnosis by a licensed veterinarian or from the point at which a producer with reasonable knowledge of livestock disease should have recognized the signs. Courts and regulatory bodies apply an objective standard here — “I didn’t know it was reportable” is not a reliable defense when observable symptoms are present.

Key Insight: Laboratory directors at accredited diagnostic labs are required to report positive test results directly to the CDFA AHB. However, this does not extend your personal deadline — your reporting obligation runs independently from the lab’s obligation.

California also participates in the National Animal Health Reporting System (NAHRS), a USDA-coordinated program that aggregates state-level disease data for national surveillance. Reports submitted to the CDFA feed into this national system, reinforcing the importance of timely and accurate state-level compliance.

What Happens After You Report in California

Filing a report with the CDFA AHB sets a structured response process in motion. The pace and scope of that response depend on the disease involved and the findings of the initial field investigation, but the general sequence is consistent across most reportable conditions.

Here is what you can typically expect after submitting a report:

1. Initial contact and triage. A CDFA district veterinarian or field investigator will contact you — often within hours for Tier 1 diseases — to gather preliminary information and assess the urgency of an on-site visit.
2. Field investigation and premises inspection. CDFA personnel will visit your operation to conduct a clinical examination of affected animals, review your records, and assess biosecurity conditions. You are legally required to provide access and cooperate fully.
3. Diagnostic sample collection. Investigators will collect blood, tissue, swabs, or other samples for laboratory testing at the CDFA Animal Health Laboratory or a USDA-approved facility. You are generally not charged for state-initiated diagnostic testing during an official investigation.
4. Quarantine and movement restrictions. If the investigation supports a reasonable suspicion of a reportable disease, the CDFA has authority under FAC Section 9561 to place a quarantine on your premises. This restricts the movement of animals, equipment, feed, and personnel until the situation is resolved. Quarantine orders are legally binding and violations carry serious consequences.
5. Coordination with USDA APHIS. For foreign animal diseases or conditions with federal reporting implications, the CDFA will notify USDA APHIS, which may deploy a federal response team, particularly if indemnity programs or interstate trade restrictions are triggered.
6. Depopulation and indemnity (if applicable). For high-consequence diseases like HPAI or FMD, state and federal authorities may authorize depopulation of affected flocks or herds. Indemnity payments — compensation for destroyed animals — may be available through USDA programs, though eligibility often depends on whether the producer complied with reporting requirements.
7. Quarantine release and follow-up. Once the investigation concludes and the premises are cleared through testing and remediation, the CDFA will issue a formal quarantine release. Follow-up monitoring may be required for a defined period.

Important Note: Producers who report promptly and cooperate fully with CDFA investigators are typically treated as partners in disease control. Producers who delay reporting or obstruct investigations face a fundamentally different regulatory relationship — one that can include criminal referral.

Throughout this process, maintaining detailed records of your own actions — when you noticed symptoms, when you called, who you spoke with, what steps you took to isolate affected animals — will serve you well both legally and practically.

Penalties for Failing to Report in California

California takes non-compliance with livestock disease reporting requirements seriously. The penalty framework is built on both the California Food and Agricultural Code and California Penal Code provisions, giving regulators and prosecutors multiple avenues for enforcement.

The consequences for failing to report a reportable livestock disease in California can include:

• Civil fines. The CDFA has authority to impose administrative penalties for violations of the FAC. Fines for failure to report can reach thousands of dollars per violation, with each day of continued non-compliance potentially constituting a separate offense.
• Criminal misdemeanor charges. Under FAC Section 9101 and related statutes, willful failure to report a reportable disease is a criminal misdemeanor in California. Conviction can result in fines and, in some cases, jail time.
• Loss of veterinary license. For licensed veterinarians, failure to report is a basis for disciplinary action by the California Veterinary Medical Board, up to and including license revocation.
• Loss of indemnity eligibility. Producers who fail to report in a timely manner may be disqualified from receiving state or federal indemnity payments for depopulated animals — a potentially catastrophic financial consequence when large herds or flocks are involved.
• Increased liability for disease spread. If a failure to report contributes to the spread of a disease to neighboring operations, the non-reporting party may face civil liability claims from affected neighbors or business partners.
• Premises quarantine and enhanced oversight. Operations with a history of non-compliance may be subject to more frequent inspections, mandatory reporting protocols, and heightened regulatory scrutiny going forward.

Common Mistake: Some producers assume that reporting a disease will automatically result in their herd being destroyed and their operation shut down. In reality, early reporting often leads to faster resolution, better access to indemnity programs, and a more collaborative relationship with CDFA investigators — outcomes that are far better than the consequences of delayed or absent reporting.

It is also worth understanding that the CDFA’s enforcement posture is generally oriented toward compliance and disease control rather than punitive action against good-faith producers. The agency’s primary goal is containment and eradication — penalties exist to deter deliberate non-compliance, not to penalize producers who make honest mistakes while acting in good faith.

For operations that manage animals beyond traditional livestock — including those with companion animals on-site — understanding disease reporting obligations across species categories is equally important. Conditions like Lyme disease in dogs or Chagas disease in dogs that share zoonotic pathways with livestock diseases underscore why a whole-operation approach to disease awareness matters. Producers who stay informed about tick-borne disease prevention across all animals on their property are better positioned to recognize and respond to emerging health threats early.

Ultimately, mandatory livestock disease reporting in California is not a bureaucratic inconvenience — it is the foundation of a disease surveillance system that protects your operation, your neighbors, California’s agricultural economy, and in some cases, public health. Knowing the rules, recognizing the signs, and acting promptly are the three pillars of compliance. When in doubt, report. The cost of a phone call is never higher than the cost of an outbreak that could have been stopped.