What is the Americans with Disabilities Act (ADA)?

There are many laws that protect the civil rights of people in the United States — laws against discrimination by race, sex, age, religion, national origin, and more. The Americans with Disabilities Act (ADA), signed into law by President George H.W. Bush on July 26, 1990, is the one that protects people with disabilities. It’s a civil-rights statute that prohibits discrimination in employment, government services, public accommodations (including most private businesses open to the public), commercial facilities, and telecommunications.

Thirty-plus years after its passage, the ADA remains one of the most-cited civil-rights laws in the U.S. — and in 2026, with the rise of web accessibility litigation and the Department of Justice’s recent Title II rule for government websites, understanding how it applies is more important than it has ever been.

Why the Americans with Disabilities Act Matters

The ADA protects more than 61 million Americans with disabilities — roughly one in four adults, per the Centers for Disease Control and Prevention. Its core promise: people with disabilities should have the same access to jobs, public services, businesses, and communication that everyone else has. Where barriers exist, entities subject to the law must take reasonable steps to remove them.

The ADA was amended by the ADA Amendments Act of 2008 (ADAAA), effective January 1, 2009. That amendment broadened the definition of “disability” after a series of Supreme Court rulings had narrowed it — reaffirming that the law should be construed broadly in favor of coverage. In practical terms, the ADAAA made it harder for employers and public entities to argue someone “isn’t disabled enough” to qualify for protection.

Who the Americans with Disabilities Act Applies To

The ADA defines a person with a disability as, per the Civil Rights Division of the U.S. Department of Justice, “a person who has a physical or mental impairment that substantially limits one or more major life activities, a person who has a history or record of such an impairment, or a person who is perceived by others as having such an impairment.”

Major life activities include (but aren’t limited to) seeing, hearing, walking, speaking, breathing, learning, working, caring for oneself, and — per the ADAAA’s clarifications — the operation of major bodily functions. Someone unable to drive because of a disability is covered. Someone with a mental-health condition that substantially limits a major life activity is covered. So is anyone with a record of such an impairment (even if currently managed) or anyone regarded as having one (protecting against stereotyping).

Mental impairments are diagnosed using current clinical standards — today, that’s the DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision, published March 2022). Not every DSM-5-TR diagnosis is a covered ADA disability. Current illegal drug use is explicitly excluded from ADA protection, though a history of addiction that is in recovery can qualify. Stress by itself isn’t a disability; an anxiety disorder that substantially limits major life activities can be.

Who Needs to Know About the ADA

Practically, anyone who runs a business open to the public, employs 15 or more people, operates a state or local government service, builds public facilities, or runs a telecommunications service needs to understand the ADA. In the era of websites and mobile apps, that now covers almost everyone:

• Employers with 15 or more employees (Title I)
• State and local governments and their contractors (Title II)
• Private businesses that are “places of public accommodation” — restaurants, hotels, stores, private schools, medical offices, gyms, theaters, and the vast majority of for-profit businesses (Title III)
• Telecommunications providers (Title IV)

Even if your business isn’t directly covered, the practical expectation — reinforced by both federal guidance and courts — is that websites and digital services should be accessible to people with disabilities. Modern civil-rights law on disability increasingly treats digital accessibility as an extension of physical accessibility.

The Five Titles of the ADA

The ADA is divided into five titles, each covering a different domain:

Title I — Employment

Title I bars employment discrimination by private employers with 15 or more employees, state and local governments, employment agencies, and labor unions. Covered entities must provide reasonable accommodations for qualified candidates and employees with disabilities unless doing so would cause the employer undue hardship. Reasonable accommodations include (but aren’t limited to) assistive equipment, schedule modifications, modified training materials, accessible communication, reserved parking, and modified job duties when the essential functions can still be performed.

Employers cannot ask applicants about disabilities or require medical examinations before a conditional offer of employment. Medical information obtained about employees must be kept confidential. Title I also prohibits retaliation against employees who assert their ADA rights.

The ADAAA of 2008 significantly broadened Title I coverage by expanding the definition of “substantially limits” and ensuring that mitigating measures (medications, prosthetics, assistive devices) are not considered when determining whether an impairment qualifies as a disability.

Title II — Public Services

Title II applies to state and local governments and their departments, agencies, and service providers — including public schools, public universities, public transportation, and public housing authorities. It requires that people with disabilities have equal opportunity to participate in and benefit from government programs, services, and activities.

Title II also covers public transportation administered by state and local governments or their contracted operators. Amtrak and publicly operated commuter rail systems must meet accessibility standards. Public transit agencies must ensure that both their vehicles and facilities are accessible, and must offer paratransit services for individuals who cannot use fixed-route services.

The most significant recent Title II development came on April 24, 2024, when the Department of Justice issued its Title II Web Accessibility Final Rule. The rule explicitly requires state and local governments’ websites and mobile apps to meet WCAG 2.1 Level AA, with compliance deadlines of April 24, 2026 for entities serving 50,000 or more people, and April 26, 2027 for smaller public entities. This is the first time the ADA has had an explicit, binding technical standard for digital accessibility.

Title III — Public Accommodations

Title III applies to places of public accommodation — essentially any private business open to the public. This includes restaurants, hotels, movie theaters, doctors’ offices, lawyers’ offices, gyms, stores, schools (private), day-care centers, parks, and most other facilities people visit in daily life. It also covers “commercial facilities” like warehouses and factories with respect to new construction and alterations.

New construction completed after January 26, 1993 must be accessible. Existing facilities must remove architectural barriers where doing so is “readily achievable” — meaning easily accomplishable without significant difficulty or expense. Alterations to existing facilities must be done in an accessible manner. Historic buildings have some flexibility but cannot be exempt when accessibility can be achieved without threatening historic significance.

Title III also explicitly protects service animals — trained animals (almost always dogs; miniature horses are separately recognized) that perform tasks for a person with a disability. Businesses may not refuse service, charge additional fees, or segregate customers because of a service animal. A business can only ask two questions: (1) is the animal required because of a disability, and (2) what work or task has it been trained to perform. They cannot demand documentation, require the animal to demonstrate the task, or ask about the person’s disability.

A service animal may be excluded only if it is out of control and the handler cannot regain control, or if it is not housebroken. Emotional support animals are not service animals under the ADA and are not covered by Title III.

In 2010, the DOJ added specific regulations regarding accessibility at swimming pools, spas, and hotel pool lifts. In March 2022, the DOJ issued guidance reaffirming that Title III applies to the websites of businesses covered by the law — a position federal courts have increasingly endorsed. More on this below.

Title IV — Telecommunications

Title IV amended the Communications Act of 1934 to require telecommunications companies to make their services accessible to people with hearing and speech disabilities. The statutory core is the Telecommunications Relay Services (TRS) system — services that enable people with hearing or speech disabilities to communicate via the telephone network.

Traditional TRS used dedicated equipment (TTY / TDD machines) and required a human operator to translate between voice and text. Today, TRS services are increasingly delivered over the internet: IP Relay (text via the web), Video Relay Services (VRS) for American Sign Language users via video, and Captioned Telephone Service (CTS) that displays real-time captions of a hearing caller’s speech. Mobile apps now support most of these services.

Closed captioning on television (and increasingly on streaming video) is another Title IV-adjacent protection — though much of the modern captioning landscape is governed by the Twenty-First Century Communications and Video Accessibility Act (CVAA) of 2010, which extended the ADA’s telecommunications principles to modern IP-based video and mobile communications.

The Federal Communications Commission (FCC) enforces Title IV.

Title V — Miscellaneous Provisions

Title V contains the technical and miscellaneous provisions of the ADA — its relationship to other federal laws, insurance exemptions, and anti-retaliation protections. Key provisions:

• The ADA does not alter or override Section 504 of the Rehabilitation Act of 1973, which prohibits disability discrimination by entities receiving federal funds. Both statutes work together.
• People who exercise their ADA rights are protected from retaliation, coercion, threats, or interference.
• The ADA doesn’t require accommodations that would cause undue hardship (Title I) or fundamentally alter a service (Title II and III).
• Reverse-discrimination claims are prohibited — someone without a disability cannot sue under the ADA for being treated differently from someone with one.

Why the ADA Was Written

Before 1990, people with disabilities faced widespread discrimination with little legal recourse. The Rehabilitation Act of 1973 had extended limited protections to federal employees and federally funded entities through Section 504, but private-sector and broader public-sector protections were absent. The disability-rights movement of the 1970s and 1980s — organized sit-ins, the “Capitol Crawl” of March 1990 (where disability activists crawled up the Capitol steps in a symbolic protest of inaccessible federal buildings), and sustained lobbying — built the political momentum for comprehensive legislation.

President George H.W. Bush signed the ADA into law on July 26, 1990, calling it “a sledgehammer” to tear down walls of discrimination. Subsequent amendments — most notably the ADAAA of 2008 — have refined and strengthened its reach. Thirty-plus years on, the ADA is the backbone of U.S. disability civil-rights law, directly or indirectly touching almost every public and commercial space in the country.