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What Is the Americans with Disabilities Act?

The five titles of the ADA, reasonable accommodation obligations, architectural accessibility, and public accommodations.

Updated: Nov 8, 2026
4 min read
Rev. 3
Direct Short Answer

The Americans with Disabilities Act (ADA) is a federal civil rights law passed in 1990 that prohibits discrimination against people with disabilities in employment, state and local government services, public accommodations, transportation, and telecommunications. It protects anyone with a physical or mental impairment that substantially limits a major life activity, anyone with a record of such an impairment, and anyone regarded as having one. Covered employers must provide reasonable accommodations unless doing so would cause undue hardship, and businesses open to the public must remove barriers and make their services accessible.

Key Takeaways
  • The ADA prohibits disability discrimination in employment, government services, and public accommodations.
  • Disability is defined broadly to include current impairments, a record of impairment, or being regarded as impaired.
  • Employers with 15 or more employees must provide reasonable accommodations unless they cause undue hardship.
  • Under the ADA, service animals are trained dogs (and in some cases miniature horses); emotional support animals are not covered.
  • Employment complaints generally go to the EEOC within 180 or 300 days.

Who Is Protected

Under 42 U.S.C. § 12102, a person has a disability if they:

  1. Have a physical or mental impairment that substantially limits one or more major life activities (such as walking, seeing, hearing, learning, working, or the operation of major bodily functions like immune or neurological function)
  2. Have a record of such an impairment, or
  3. Are regarded as having such an impairment

The ADA Amendments Act of 2008 directed courts to interpret disability broadly. Conditions such as diabetes, epilepsy, cancer, HIV, major depression, and many others are typically covered, and mitigating measures like medication generally are not considered when deciding whether someone has a disability.

The Main Titles of the ADA

TitleCoversKey duties
Title IEmployers with 15 or more employees, employment agencies, labor unionsNo discrimination in hiring, pay, promotion, or firing; reasonable accommodations
Title IIState and local governments, public transitEqual access to programs, services, and activities; accessible facilities
Title IIIPrivate businesses open to the public (stores, restaurants, hotels, doctors' offices, gyms, schools, and more)Equal access; remove readily achievable barriers; accessible new construction; auxiliary aids
Title IVTelecommunicationsRelay services for people with hearing or speech disabilities
Title VMiscellaneousIncludes protection against retaliation

Reasonable Accommodations at Work

A qualified employee or applicant — someone who can perform the essential functions of the job with or without accommodation — is entitled to a reasonable accommodation unless it would cause the employer undue hardship (significant difficulty or expense). Examples include:

  • Modified schedules or part-time work
  • Remote work where appropriate
  • Accessible workstations and assistive technology
  • Changes to non-essential job duties
  • Reassignment to a vacant position
  • Leave for treatment

Employees usually start the process by telling the employer they need a change at work because of a medical condition. The employer and employee then engage in an interactive process to identify an effective accommodation. Employers can request reasonable medical documentation but must keep medical information confidential.

Access to Businesses and Government Services

Businesses and governments must make their goods, services, and programs accessible. This includes:

  • Physical access: ramps, accessible parking, entrances, restrooms, and routes, following the ADA Standards for Accessible Design
  • Effective communication: sign language interpreters, captioning, large print, or other auxiliary aids
  • Policy changes: reasonable modifications to policies, such as allowing a service animal in a no-pets store

Older buildings must remove barriers when doing so is readily achievable, while new construction and alterations must meet accessibility standards. In 2024, the Department of Justice adopted a rule requiring state and local government websites and mobile apps to meet specific accessibility standards on a phased schedule.

Service Animals

Under ADA regulations (28 C.F.R. § 35.136), a service animal is a dog individually trained to do work or perform tasks for a person with a disability, with a separate provision for trained miniature horses. Businesses may ask only two questions when the need is not obvious:

  1. Is the animal required because of a disability?
  2. What work or task has the animal been trained to perform?

They cannot demand documentation or ask about the person's disability. Emotional support animals are not service animals under the ADA, though they may be protected in housing under the Fair Housing Act.

How to File a Complaint

Type of problemWhere to fileDeadline
Employment (Title I)EEOC or state fair employment agency180 days, or 300 days where a state agency also enforces a similar law
State or local government (Title II)U.S. Department of Justice or the relevant federal agencyGenerally 180 days
Businesses open to the public (Title III)U.S. Department of Justice, or a private lawsuitLawsuit deadlines depend on state law

In private Title III lawsuits, individuals can obtain injunctive relief (an order to fix the problem) and attorney's fees, but not money damages under federal law. Some state laws, such as California's, allow damages for accessibility violations.

Authoritative Sources & Citations

Verified Citations

LawScope strictly cites primary government, court, and statutory records to substantiate legal analyses.

  • StatuteCornell Law School Legal Information Institute

    42 U.S.C. § 12102 – Definition of disability

    View Source
  • StatuteCornell Law School Legal Information Institute

    42 U.S.C. § 12182 – Prohibition of discrimination by public accommodations

    View Source
  • RegulationCornell Law School Legal Information Institute

    28 C.F.R. § 35.136 – Service animals

    View Source
  • GovernmentU.S. Department of Justice

    ADA.gov – The Americans with Disabilities Act

    View Source
  • GovernmentU.S. Equal Employment Opportunity Commission

    EEOC – Disability-Related Resources

    View Source

Frequently Asked Questions

No. The employer must provide an effective reasonable accommodation, but it can choose among effective options and does not have to provide one that causes undue hardship.
Elena Vance
Elena Vance(Senior Legal Research Editor)

Elena Vance has over a decade of experience analyzing federal statutes, administrative regulations, and appellate jurisprudence. She specializes in translating complex civil rights, employment, and constitutional law topics into accessible, research-backed public knowledge resources.

Editorial staff researcher; does not provide legal representation or attorney-client advice.

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