In short
A legitimate ESA letter makes two findings, that you have a disability and a disability-related need for the animal (the facts 24 C.F.R. § 100.204(a) turns on), and identifies who made them. Iowa Code § 216.8C(1) lists eight elements that work as a checklist anywhere, including licence number and type, what the animal does, and issue and expiry dates. It should not name your diagnosis or carry a registry number.
The honest starting point is that federal law does not describe an ESA letter. Not the format, not the wording, not the profession that writes it, not how long it lasts.
24 C.F.R. § 100.204(a) creates a duty to make reasonable accommodations “when such accommodations may be necessary to afford such person equal opportunity to use and enjoy a dwelling,” and § 100.201 defines the disability that triggers it. Neither sentence mentions a document. The document exists because a housing provider who cannot see a disability is allowed to ask for information about it, and a written statement from a clinician turned out to be the least intrusive way to supply it.
That gap used to be filled, loosely, by HUD sub-regulatory guidance. It is no longer. The two assistance-animal notices, FHEO 2020-01 and FHEO 2013-01, were withdrawn by HUD’s Office of Fair Housing and Equal Opportunity with effect from 17 September 2025, at 91 FR 17291 under Docket No. FR-6571-N-01. The regulations came through untouched. The memo that described what documentation should look like did not.
So the question “what is a legit ESA letter” now has no federal answer at all. It has a much better one, which is that a small number of states got tired of the ambiguity and legislated the contents.
What does Iowa Code § 216.8C require an ESA letter to say?
Iowa Code § 216.8C(1) says that on a request for documentation, a licensee “shall make a written finding that includes all of the following,” and then gives eight paragraphs. It is worth going through them one at a time, because each one exists to answer an objection a landlord actually raises.
(a) Whether the patient or client has a disability. The first of the two findings. Note the phrasing, whether, not that. The statute contemplates an assessment with a real answer, which can be no.
(b) Whether the patient has a disability-related need for an assistance animal. The second finding, and the one letters most often skip. A disability alone does not carry an animal with it. The connection is the claim.
(c) The particular assistance provided by the assistance animal, if any. This is the single most valuable line in a letter and the most commonly missing. It is where the document stops being about a person’s condition and starts being about what changes when the animal is present. A letter that says only “the patient benefits from the animal” tells a housing provider nothing it can act on.
(d) Certification whether the provider-patient relationship has existed, in person or via telehealth, for at least thirty days between the licensee and the patient or client. Two things worth noticing. Telehealth is named in the statute as a legitimate way for the relationship to exist. And the paragraph asks the clinician to state the position, not to meet a threshold. It is a disclosure, not a condition.
(e) Certification whether the licensee is familiar with the person and the disability prior to providing the written finding. Another disclosure, and the one that separates a real evaluation from a form filled in at speed.
(f) The date the finding was issued by the licensee and the date the finding will expire. The letter should tell you its own answer to “how long is this good for,” which is a question no federal rule settles. Our guide to how long an ESA letter is good for covers what happens when it does not.
(g) The license number and type of license held by the licensee. The element that makes verification possible at all, and the one Iowa’s own published form has no field for, which is worth knowing if you are handed that form. Ask the clinician to write both on it.
(h) Whether the licensee received a separate or additional fee or other form of compensation solely in exchange for making the written finding. The most interesting paragraph in the section. The legislature did not ban a fee. It required the fee to be disclosed, on the theory that a landlord should be able to see whether the document is a by-product of care or the product itself.
Iowa Code § 216.8C(2) then adds the timing: the finding must be made within twelve months of the start of a rental agreement and is valid for twelve months or the term of the rental agreement, whichever is greater.
Does Iowa’s ESA letter checklist apply to letters from other states?
Because the eight elements are not Iowa policy preferences. They are the things any housing provider anywhere needs in order to conclude that the regulation is satisfied without asking a single medical question.
Two other states confirm the shape from different directions.
California legislates the identity block. Cal. Health & Safety Code § 122318 bars a health care practitioner from providing documentation for an emotional support dog unless they hold a valid active licence and state its number, jurisdiction, type and effective date in the documentation, are licensed in the jurisdiction where the documentation is provided, have held a client-provider relationship for at least thirty days except for individuals verified as homeless, and have completed a clinical evaluation of the need. A practitioner who ignores it faces discipline from their own licensing board.
Pennsylvania legislates the quality. The Assistance and Service Animal Integrity Act § 3(b) requires supporting documentation to be in writing and to be “reliable and based on direct knowledge,” describing the disability-related need. That phrase, direct knowledge, is what a form letter from a provider who never assessed the tenant fails.
Line those up against Iowa’s eight and the same document emerges three times. A named, licensed, checkable author. A relationship that existed before the request. An assessment that happened. Two findings and a function.
What does a legitimate ESA letter look like?
People searching for an example usually want a template to copy. That is the wrong object. A template supplies the words a clinician would write and none of the facts only a clinician can supply. What is useful is the shape, so you can see whether the letter in your hand has all its parts.
A working letter runs to about a page and moves through five blocks.
The identity block, at the top. Practice name, address, telephone number. Then the clinician’s name, credentials, licence type, licence number and the state that issued it. California requires all of that inside the document itself under § 122318 (number, jurisdiction, type and effective date), and it is the block that makes a licence lookup possible anywhere else.
The relationship sentence. How the clinician knows you and since when. Iowa turns this into two certifications, § 216.8C(1)(d) and (e): whether the provider-patient relationship has existed, in person or via telehealth, for at least thirty days, and whether the licensee is familiar with the person and the disability prior to making the finding. One sentence answers both.
The finding. That you are a person with a disability as that term is used in the fair housing rules: an impairment that substantially limits one or more major life activities, in the language of 24 C.F.R. § 100.201, without naming the condition. This is the sentence that does the legal work, and it should read like a conclusion rather than a description.
The function sentence. What the animal does for the limitation. Iowa asks for “the particular assistance provided by the assistance animal, if any” at § 216.8C(1)(c). This is the block a landlord actually reads twice, and a letter that says only that the animal provides comfort has left it blank in substance while filling it in on the page.
The dates and signature. Date of issue, a review or expiry date, and a signature. Iowa § 216.8C(1)(f) requires both dates on the face of the finding and § 216.8C(2) supplies the default period, twelve months or the lease term, whichever is longer.
Five blocks. A letter missing any one of them is not fraudulent; it is incomplete, and incomplete is what gets a request delayed while somebody decides what to do about it.
What should a legitimate ESA letter leave out?
Just as instructive.
Your diagnosis. It does not belong there, and no landlord may demand it. Iowa Code § 216.8B(6)(a) provides that a landlord “shall not request information under this section that discloses a diagnosis or severity of a person’s disability or any medical records relating to the disability,” with the tenant free to volunteer it if they choose. Florida § 760.27(3) is to the same effect. A letter that names a condition is not invalid. It is simply giving away ground nobody could take.
A registration number, certificate ID, or membership code. Covered above in the FAQ, and worth repeating because it is the most common defect on letters people have paid for. Iowa § 216.8B(4) and Florida § 760.27(3) both say a registration is not sufficient. A clinical letter carrying a registry number reads as a document assembled by a vendor rather than written by a clinician.
A photograph of the animal, a breed, or a weight. Not required, and occasionally harmful. Breed and weight are the categories a landlord uses to apply a pet policy, and an accommodation is assessed on this animal’s behaviour rather than on its category, breed and weight restrictions covers why that distinction matters.
Any promise about what the landlord must do. The letter states clinical findings. The legal argument belongs in your accommodation request, which is a separate document you write yourself.
How do you check whether your ESA letter is legitimate?
Take the document out and mark it up. There are eight lines to look for and you will know within two minutes.
Does it name a licensed clinician, with a licence number and licence type? Does it state a licence jurisdiction? Does it say, in a sentence you could read aloud, what the animal does for a limitation you actually have? Is there an issue date? Is there an expiry date, or at least a stated review period? Is there a signature and a way to reach the practice? Does it avoid naming a diagnosis? Does it avoid mentioning a registry?
A letter that clears all of those is legitimate in the only sense that matters: it contains what a housing provider needs, identifies who is standing behind it, and survives a check. Do landlords actually verify ESA letters walks through what that check consists of.
A letter that fails two or three of them is usually salvageable. Go back to the clinician who issued it and ask for a reissue with the licence details and dates on the face of the document. That request is routine and costs nothing.
A letter that fails most of them was probably never written by a clinician at all, and the fix is not editing. It is an assessment. Ask a provider you already see first; they hold the history and the visit is the only cost. A community mental health centre will do the same work on a sliding scale, on an intake built to start treatment, which usually takes longer than a lease conversation allows. Where neither route fits the time in front of you, a licensed evaluation covers the same ground on a timetable a lease can live with: a short screening, an assessment by someone holding a licence where you live, and a document at the end of it only if the findings carry one. How to get a legitimate ESA letter sets out that process end to end, and the qualification quiz asks the same threshold questions a clinician opens with, before you spend anything.
Frequently Asked Questions
What does a legitimate ESA letter have to say?
Two findings and the identity of the person who made them. The findings are that you have a disability and that you have a disability-related need for the animal, the two facts 24 C.F.R. § 100.204(a) turns on. The identity is the clinician's licence number, licence type, signature and dates. Iowa Code § 216.8C(1) is the only place in the country where all of that is set out as a numbered list, and it works as a checklist for a letter written anywhere.
Does an ESA letter have to be on letterhead?
No statute requires letterhead, and Florida § 760.27(3) expressly bars a housing provider from requiring a specific form or a notarised statement. But letterhead carries the practice name, address and phone number, which is what makes a confirmation call possible. A letter without any of that is harder to check, and a landlord who cannot check it has fewer reasons to accept it.
Should my ESA letter name my diagnosis?
It does not need to, and there is a good argument for leaving it out. Iowa Code § 216.8B(6)(a) bars a landlord from requesting information that discloses a diagnosis, the severity of a disability, or medical records, and Florida § 760.27(3) does the same. A letter that volunteers the diagnosis hands over more than anyone was entitled to ask for. What the letter must convey is the limitation and the animal's role, not the label.
Is an online ESA letter legitimate?
It depends entirely on who signed it and what they did first. Telehealth is named in Iowa's statute at § 216.8C(1)(d) as a way the provider-patient relationship can exist. What separates a real telehealth letter from a purchased one is the assessment behind it, the licence held in the right state, and the willingness of the clinician to confirm authorship. A document generated from a form with no clinician contact fails on all three.
How can I tell if the ESA letter I already paid for is any good?
Run it against the eight elements below. The three that fail most often are the licence number and licence type, the sentence describing what the animal actually does for the limitation, and the issue and expiry dates. Each of those is fixable by asking the issuing clinician to reissue the letter with the missing details on the face of it, which costs nothing but an email.
Does a registration number make a letter more legitimate?
It makes it look worse. No registry has legal standing in any state. Iowa Code § 216.8B(4) says a registration of any kind, including an identification card, patch or certificate obtained electronically or in person, is not sufficient information to establish disability or need, and Florida § 760.27(3) says an internet registration or certificate is not by itself sufficient proof. A registration number on a clinical letter signals that the two documents came from the same place, which is exactly the wrong signal.
Share this guide
Support Animal Editorial Team
Reviewed by licensed providers
The Support Animal editorial team researches ESA and PSA regulations nationwide. Every guide is fact-checked against federal and state law and reviewed by licensed providers before publication.
