Federal agencies: Section 508
When an agency develops, procures, maintains or uses technology, it has to make sure employees and members of the public with disabilities get comparable access. The Section 508 Standards use WCAG 2.0 Level AA for electronic content, and buyers ask for an Accessibility Conformance Report.
29 U.S.C. 794d(a)(1)(A); 36 CFR Part 1194
State and local governments: Title II
Web content and mobile apps a public entity provides directly or through contractual, licensing or other arrangements have to meet WCAG 2.1 Level AA: from April 26, 2027 for entities of 50,000 or more, and from April 26, 2028 for smaller ones and special districts.
28 CFR 35.200(a) and (b)
Buyers with HHS money: Section 504
Organizations with fifteen or more employees whose programs get HHS money, even through a city or state, owe WCAG 2.1 Level AA for the web content and apps they provide directly or through contracts from May 11, 2027, and smaller ones from May 10, 2028.
45 CFR 84.84(a) and (b)
Businesses and nonprofits: Title III
A public accommodation can't deny people the chance to take part directly or through contractual, licensing or other arrangements, so a vendor's checkout or registration platform is part of the buyer's obligation.
28 CFR 36.202(a)
Communications products: the CVAA
Messaging, VoIP and interoperable video conferencing products answer to the accessibility rules for advanced communications services under the 21st Century Communications and Video Accessibility Act.
47 CFR Part 14
The standard isn't the same everywhere
Section 508 uses WCAG 2.0 AA. Title II and the HHS rule use WCAG 2.1 AA. A report tested to 2.0 alone won't answer a state or local buyer from 2027.
36 CFR 1194 E205.4; 28 CFR 35.200(b); 45 CFR 84.84(b)