Section 508 only applies to US government organisations and businesses/agencies providing services to those government organisations. US legal requirements for

Section 508 only applies to US government organisations and businesses/agencies providing services to those government organisations. US legal requirements for public sites are probably covered in ADA (Americans with Disabilities Act), under the provision of reasonable accommodations. So far legal rulings are varied and vague, swinging one way then the other about whether ADA applies to websites (despite a DOJ opinion that they do/should). Some states have their own legislation, like California's Unruh Civil Rights Act which was used against Amazon (Target settled and agreed to make their website accessible).