Section 508 vs ADA Title II: What's the Difference and Which Applies to You?
Two federal laws govern digital accessibility for government entities: Section 508 of the Rehabilitation Act and ADA Title II. They are frequently confused, often conflated, and sometimes treated as interchangeable. They are not. Understanding the difference — and knowing which applies to your organization — is essential for building a compliant accessibility program.
This guide provides a clear, practical comparison of Section 508 and ADA Title II as they apply to document accessibility and PDF remediation in 2026.
The Quick Answer
Section 508
Federal agencies
Applies to federal government agencies and organizations that receive federal funding or provide services under federal contract.
ADA Title II
State & local government
Applies to all state and local government entities: cities, counties, school districts, public universities, courts, transit authorities, and more.
If you are a state or local government entity, ADA Title II is your primary obligation — with specific deadlines in 2026 and 2027. If you are a federal agency or federal contractor, Section 508 is your primary obligation. If you are a state or local entity that receives federal funding, you may need to comply with both.
Section 508: The Federal Standard
Section 508 of the Rehabilitation Act (29 U.S.C. Section 794d) was originally enacted in 1998 and significantly updated in 2017. It requires federal agencies to make their electronic and information technology (EIT) accessible to people with disabilities.
Who It Covers
- All federal executive branch agencies
- Independent federal agencies
- The U.S. Postal Service
- Federal contractors and vendors (through FAR clause 52.204-25)
- Organizations receiving federal financial assistance (through Section 504)
Technical Standard
After the 2017 refresh, Section 508 incorporates WCAG 2.0 Level AA as the technical standard for web content and electronic documents. The refresh aligned Section 508 with international standards by adopting WCAG rather than maintaining a separate set of federal-specific criteria.
Note: Section 508 references WCAG 2.0, not WCAG 2.1. WCAG 2.1 added 17 new success criteria beyond WCAG 2.0, primarily addressing mobile accessibility and cognitive disabilities. Meeting WCAG 2.1 AA (as required by ADA Title II) automatically satisfies the WCAG 2.0 AA requirement of Section 508, since 2.1 is a superset of 2.0.
Enforcement
Section 508 is enforced through administrative complaints filed with federal agencies, which are investigated by each agency's civil rights office. The U.S. Access Board provides technical assistance and guidance. Individuals can also file lawsuits under Section 508, though this is less common than ADA litigation. Federal contractors risk losing contracts for non-compliance.
ADA Title II: The State and Local Standard
Title II of the Americans with Disabilities Act (42 U.S.C. Section 12131–12165) prohibits discrimination by state and local government entities. In April 2024, the DOJ published a final rule that, for the first time, established specific technical standards and deadlines for digital accessibility under Title II.
Who It Covers
- State agencies and departments
- Counties and municipalities
- Public school districts (K-12)
- Public colleges and universities
- Courts and judicial systems
- Public transit authorities
- Public utilities and special districts
- Law enforcement agencies
- Public libraries
- Public hospitals and health departments
Technical Standard
The 2024 final rule requires WCAG 2.1 Level AA conformance for all web content and digital documents. This is a newer and more comprehensive standard than the WCAG 2.0 required by Section 508, including additional criteria for mobile accessibility, content reflow, text spacing, and status messages.
Deadlines
April 24, 2026
Entities serving 50,000+ residents
April 26, 2027
Entities serving fewer than 50,000
Enforcement
ADA Title II is enforced by the DOJ through investigations, consent decrees, and litigation. Private individuals and organizations can also file lawsuits. Civil penalties can reach $75,000 for a first offense and $150,000 for subsequent violations. Enforcement is expected to intensify significantly after the 2026 deadline passes.
Side-by-Side Comparison
| Factor | Section 508 | ADA Title II |
|---|---|---|
| Applies to | Federal agencies, contractors | State & local government |
| Technical standard | WCAG 2.0 AA | WCAG 2.1 AA |
| Compliance deadline | Ongoing (no specific deadline) | April 2026 / April 2027 |
| Enforcement body | Individual agencies, U.S. Access Board | DOJ |
| Civil penalties | Contract loss, corrective action | $75K/$150K per violation |
| Private lawsuits | Limited | Yes, common |
| Document scope | All EIT, including documents | All web content and documents |
Where They Overlap
Many government entities are subject to both Section 508 and ADA Title II. Common overlap scenarios:
- State agencies receiving federal grants. A state health department funded partly by HHS grants must meet both ADA Title II (as a state entity) and Section 508 (as a recipient of federal financial assistance, through Section 504 of the Rehabilitation Act).
- Public universities receiving federal research funding. A state university with NIH or NSF grants is covered by both ADA Title II and Section 508.
- Local agencies administering federal programs. A county office administering HUD housing programs or FEMA disaster relief is subject to both sets of requirements.
- K-12 school districts. Public school districts receiving federal education funding must comply with both ADA Title II and Section 508 (through Section 504).
The good news: meeting WCAG 2.1 AA (the ADA Title II standard) automatically satisfies the WCAG 2.0 AA requirement of Section 508, since WCAG 2.1 is a superset of WCAG 2.0. If you remediate your documents to WCAG 2.1 AA, you are covered for both laws.
Which Standard Should You Target?
Regardless of which law applies to your organization, the practical recommendation is the same: target WCAG 2.1 Level AA for all documents. Here is why:
- WCAG 2.1 AA is a superset of WCAG 2.0 AA, so meeting 2.1 satisfies both standards.
- The Section 508 standard is expected to be updated to reference WCAG 2.1 or later in the near future.
- Many state laws (like California's Government Code 7405) are also aligning with WCAG 2.1.
- Targeting the higher standard provides better protection against future regulatory changes.
- Most importantly, WCAG 2.1 AA provides better accessibility for people with disabilities — which is the point.
How CASO Comply Covers Both
CASO Comply remediates documents to WCAG 2.1 Level AA, PDF/UA (ISO 14289), and Section 508 simultaneously. There is no need to choose between standards or run separate remediation processes for different compliance requirements.
Every document processed through CASO Comply is validated against all three standards using industry-leading compliance checkers, and you receive a compliance report confirming conformance. Whether you are a state agency, a city government, a school district, or a federal contractor, a single remediation pass through CASO Comply addresses all of your document accessibility obligations.
For more details on our Section 508 compliance capabilities, visit our Section 508 Compliance service page.
One platform. Every standard. Full compliance.
Whether you need Section 508, ADA Title II, or both, CASO Comply remediates your documents to meet all applicable standards in a single pass. Get started with a free compliance scan.