Coggins Test Requirements in Washington State: What Every Horse Owner Must Know

Equine Infectious Anemia is one of the few horse diseases that carries legal consequences just for failing to test. In Washington State, the rules around the Coggins test touch nearly every horse owner — whether you compete, trail ride, buy and sell horses, or simply move animals across state lines. Getting the paperwork wrong does not just delay your trip; it can result in fines, turned-away horses at state borders, and serious liability if a positive case goes unreported.

This guide walks you through every layer of Washington’s EIA and Coggins test requirements: which animals are covered, when testing is mandatory, how the test works, what happens at state borders, and the strict protocols that apply when a horse tests positive. Whether you are a first-time horse owner or a seasoned competitor, understanding these rules protects your herd and keeps you on the right side of state and federal law.

What Is Equine Infectious Anemia (EIA) and Why It Is Regulated in Washington

EIA is an infectious blood-borne disease caused by a lentivirus — similar in structure to HIV in humans — affecting horses, donkeys, and mules. The disease spreads through blood-feeding insects and the sharing of blood-contaminated items such as needles and syringes, and there is no treatment or vaccine for it. Once a horse contracts the virus, that infection is permanent.

Infected horses may die from the disease, but more often they show little to no symptoms and recover, becoming chronically infected lifelong carriers of the virus — and these horses serve as a reservoir that continues to spread it. Many horses suffer from severe symptoms including irregular heartbeat, weakness, swollen abdomen or legs, high fever, anemia, abortion in pregnant mares, or even sudden death.

In 2020, 80 percent of all EIA infections in the United States were in quarter horse racehorses and were human-caused. Washington has seen outbreaks tied directly to the quarter horse and bush track racing circuits. As Washington State Veterinarian Dr. Amber Itle noted, “EIA is a very serious disease in horses that can quietly spread through a herd for many months to years prior to detection and there is no treatment for it.”

Because of the increase in transmission, the lack of treatment, the lack of prevention, and the critical nature of the disease, the state governments of Washington, Oregon, and Idaho revoked their previous Memorandum of Understanding that had exempted horses traveling between those states from Coggins testing. Regulation is Washington’s primary tool for keeping EIA from spreading silently through the state’s equine population.

Key Insight: EIA is a federally reportable disease. Any confirmed positive result in Washington triggers mandatory reporting to the Washington State Department of Agriculture (WSDA) and federal animal health authorities — not just a conversation with your vet.

Which Animals Require a Coggins Test in Washington

EIA, also known as Coggins disease, is a bloodborne illness affecting only members of the Equidae family — horses, ponies, donkeys, mules, and zebras. All members of this family are subject to Washington’s EIA testing requirements when the triggering conditions apply. The rules are not limited to horses used for competition; they cover any equine that crosses a state border, changes ownership, or enters a regulated event.

Specifically, testing applies to:

• Horses, donkeys, and mules entering Washington from another state
• Equines moving to Washington permanently
• Equines participating in competitions, shows, and organized events that require proof of a negative test
• Horses being purchased, with many sellers and buyers requiring a current negative result as part of a pre-purchase exam
• Equines used in semen and embryo transfer programs (which carry additional permit requirements)

Stable owners, horse show and event managers should require and verify current negative Coggins certificates for all horses entering the premises. While this is framed as a best practice at the federal level, many Washington facilities and events enforce it as a condition of entry. If you board your horse or compete regularly, expect to produce a current negative Coggins certificate on request. You can learn more about related equine documentation requirements in Washington through the Washington brand inspection guide.

When a Coggins Test Is Required in Washington

All equines entering Washington are required to have a Certificate of Veterinary Inspection (CVI) and a negative Coggins test within 12 months. This 12-month window is the standard for most import situations. However, the specific timeframe can shift depending on the type of movement involved.

Situation	CVI Required	Coggins Validity	Notes
Entering Washington (temporary)	Yes (30-day CVI)	Within 12 months	Coggins must be listed on the CVI
Moving to Washington permanently	Yes (30-day CVI)	Within 12 months	Equines moving to Washington permanently are required to enter with a 30-day CVI with a negative Coggins test listed on the CVI.
Event/competition horses (multi-state travel)	Yes (EECVI)	Within 12 months	6-month Extended CVI available for western states
Travel to Canada	Yes (Canadian International Certificate)	Within 6 months	Canada requires a negative Coggins test within 6 months and a Canadian International Certificate within 30 days of travel.

Event horses moving between states can use a 6-month Extended Equine Certificate of Veterinary Inspection (EECVI) for travel in Washington, and it is essential that a negative Coggins test within 12 months is listed on the CVI. If the Coggins test listed on the EECVI expires before the CVI expires, the CVI becomes invalid when the Coggins expires.

For intrastate movement within Washington, there is no universal state mandate requiring a Coggins test for horses that never leave the state. However, a negative Coggins test is typically required before your horse can take part in competitions and events, and testing is highly recommended for all horses that spend time near other horses whether in fields or boarding stables.

Pro Tip: Plan ahead. Scheduling the performance of these exams and tests, and the return of results from the laboratory, can take a few days — so allow a couple of weeks prior to your estimated travel time. An expedited test option can return results in 12 to 24 hours if needed.

How the Coggins Test Works and Approved Testing Methods in Washington

Developed by and named after Dr. Leroy Coggins in the 1970s, the test is performed by a USDA-accredited veterinarian who draws a small blood sample from the horse with a needle and syringe, which is then sent to a USDA-approved laboratory where it is analyzed for antibodies against the EIA virus. No special preparation is needed from the horse owner, but the paperwork requirements are specific.

Your veterinarian will give your horse a thorough physical examination, complete an EIA form that includes details such as your horse’s coloration, markings, age, and breed, and digital images will be taken. A blood sample is then taken and submitted to an accredited lab for analysis along with the EIA form and the images.

Washington accepts two USDA-approved laboratory methods for EIA detection:

• AGID (Agar Gel Immunodiffusion) — the original Coggins test method. This test takes more than 24 hours to complete and detects antibodies to the virus. Because the EIA virus causes lifelong infection, a positive AGID result is considered a true positive.
• ELISA (Enzyme-Linked Immunosorbent Assay) — ELISA testing can be completed in less than an hour and is more sensitive but less specific. Any positive ELISA results should be re-tested with an AGID to confirm the finding before official action is taken.

Electronic Coggins tests are available through GlobalVetLINK, which allows you to access and print your horse’s results at any time. Many Washington veterinarians use this platform, making it easy to retrieve and share documentation without hunting down paper copies before a show or border crossing.

The cost of a Coggins test typically ranges from $20 to $50, depending on your location and your veterinarian’s fees, covering the exam, blood draw, and lab analysis. This cost can vary in Washington depending on the clinic and whether you choose standard or expedited processing.

Interstate Movement and Import Requirements in Washington

Moving horses across state lines into or out of Washington requires more than just a Coggins test. The three things you must have when traveling from Washington to another state or Canada are: a Coggins test, a Certificate of Veterinary Inspection, and a Horse Identification Certificate (brand inspection).

All equines leaving Washington State must be accompanied by a brand inspection. This requirement applies even if you are bringing your horse back to Washington after a trip. For a full breakdown of how brand inspections work and what fees apply, see the Washington brand inspection requirements guide.

The Pacific Northwest tri-state situation deserves special attention. Oregon, Idaho, and Washington previously had an agreement not requiring a negative Coggins when traveling between the three states, but that was revoked in February 2017 due to positive EIA cases in all three states in 2015 and 2016. Effective February 13, 2017, a horse must have a current Certificate of Veterinary Inspection, a negative Coggins test within the prior six months, and an entry permit to travel between Oregon, Washington, and Idaho.

If you are traveling between Washington, Oregon, Idaho, Nevada, California, and Montana, your horse can be issued a Six-Month Passport, which combines both a Coggins and CVI into one form and is typically good for 6 months from the date of the Coggins test. You will be required to track your trips on the back of the passport paperwork and at the end of the 6 months, send a photocopy to each state you visited. This is a practical option for owners who frequently cross state lines for competitions or trail rides.

Important Note: Washington’s import requirements can change on short notice. Veterinary officials can implement new or temporary restrictions on short notice — frequently, due to the nature of diseases flaring up throughout the course of a given year, and as health emergencies occur, states may implement temporary import restrictions. Always verify current requirements with the Washington State Department of Agriculture before travel.

Equine semen and embryos require an entry permit and must come from donors that have proof of vaccination or a negative antibody test for EVA during the current breeding season, in addition to standard EIA documentation. If you are involved in breeding programs that cross state lines, contact the WSDA directly for the current permit requirements.

What Happens When a Horse Tests Positive in Washington

A positive Coggins test result sets off a structured, legally mandated response that involves your private veterinarian, the WSDA, and in some cases the USDA’s National Veterinary Services Laboratory (NVSL). The process moves quickly and leaves little room for owner discretion.

Within 24 hours of a positive result, your horse will be placed in quarantine more than 200 yards from other horses until confirmation testing and classification are complete. The state vet will be informed and a case will be opened to ensure proper protocols are followed.

A positive result on a Coggins test indicates that a horse has been exposed to the EIA virus and is likely infected. In most cases, a second test will be submitted to confirm this infection. A private veterinarian tests the horse, and after the National Veterinary Services Laboratory (NVSL) confirms the positive test, WSDA veterinarians test horses at potentially exposed locations.

EIA is a reportable disease, meaning that a positive test result must by law be reported to local or state veterinary authorities. These officials will typically take over management of the case, ensuring that biosecurity measures are in place and advising on the next steps.

Seropositive horses are identified by a National Uniform Tag code number that the USDA state veterinarian provides, and the movement of positive horses is then closely regulated by federal agencies. From that point forward, the horse’s legal status changes permanently.

Quarantine, Euthanasia, and Isolation Rules in Washington

EIA-positive horses must be euthanized or held under strict isolation and quarantine for the remainder of their lives. Washington follows the federal USDA framework on this point, and the WSDA enforces it. There is no third option.

If the owner elects lifetime quarantine rather than euthanasia, the conditions are exacting:

• The horse must be placed under extremely strict quarantine conditions — at least 200 yards away from unaffected equids — for the rest of its life.
• EIA-positive horses are required by law to be permanently identified via branding or tattooing and quarantined for life in a screened stall.
• Equipment, feed, and handlers must not move between the infected horse and healthy horses without proper biosecurity protocols in place.
• The quarantine area must be 200 yards from other horses, and other horses that may have been in contact with infected horses will also be quarantined.

Exposed equines will be quarantined and tested, and be subject to a retest 45 to 60 days after the removal of the EIA-positive horse. Quarantine will remain in effect until negative retest results are received.

Federal and state health agencies, as well as the American Association of Equine Practitioners, support euthanasia as the most prudent, albeit emotionally difficult, option. Lifelong quarantine in a screened stall is another, less acceptable alternative. The reasoning is straightforward: EIA-positive horses will always pose an unnecessary health risk to other horses, whether or not they show signs of illness, and even in the best management situations, blood-sucking insects cannot be totally controlled or eliminated.

Important Note: The 200-yard isolation requirement is a minimum distance set by the USDA EIA program. Washington enforces this standard, and WSDA field veterinarians will verify compliance when a positive case is confirmed. Facilities that cannot meet this physical separation requirement will face pressure to elect euthanasia instead.

Washington’s WSDA works closely with owners and local veterinarians during an active case. Both locations are put under quarantine and testing and contact tracing efforts are undertaken, with WSDA field vets working closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures to prevent further infection.

Penalties for Non-Compliance in Washington

Failing to comply with Washington’s EIA and Coggins test requirements carries consequences at both the state and federal level. The WSDA has enforcement authority under Washington’s animal health statutes, and violations can result in civil penalties, forced quarantine, and seizure of animals.

The most immediate consequence of non-compliance is practical: these are mandatory requirements, and if you are stopped by authorities without these documents, large fines and interruption of your trip could result. Border crossings and livestock checkpoints in Washington and neighboring states actively check for CVI and Coggins documentation.

Specific enforcement consequences include:

• Turned away at state borders — horses without a valid CVI and current negative Coggins test will be denied entry into Washington.
• Civil penalties — the WSDA has authority to assess civil fines for violations of animal health regulations under Washington’s livestock statutes and the Washington Administrative Code (WAC).
• Forced quarantine at owner’s expense — if an animal is found to have entered Washington without proper documentation, the WSDA can order immediate quarantine, with costs borne by the owner.
• Federal liability — interstate transport of horses with a positive Coggins test is prohibited. Moving a known-positive horse across state lines is a federal violation with serious legal consequences.
• Failure to report a positive result — because EIA is a reportable disease, knowingly concealing a positive result from state or federal authorities compounds the legal exposure significantly.

The WSDA’s approach to animal health enforcement mirrors its broader compliance philosophy: penalties correspond to the seriousness of the violation, and proactive cooperation with the department is always treated more favorably than non-disclosure. If you suspect your horse may have been exposed to EIA — for example, after contact with horses from the quarter horse racing circuit — WSDA urges you to contact your veterinarian and proactively test your horse for EIA.

For context on how Washington handles related equine compliance requirements, the brand inspection requirements guide covers the documentation rules that apply when horses leave the state, and the rabies vaccine requirements page outlines Washington’s other key animal health mandates. Horse owners who also use Washington’s public lands should review Washington’s licensing framework for other regulated activities in the state.

Staying current with your horse’s Coggins testing is one of the lowest-cost, highest-impact steps you can take to protect your herd, remain legally compliant, and avoid the far more serious consequences that come with a positive EIA case. Annual testing for all horses — and testing at the time of any purchase — is the standard that Washington’s own state veterinarian and the USDA consistently recommend. If you are unsure whether your horse’s current test is still valid for an upcoming trip or event, contact your USDA-accredited veterinarian well before your departure date.