Even though there is no specific law on the books requiring sites to be in ADA compliance, it is generally accepted that sites must be accessible under the public accommodation clause. Recent years have seen an increase in lawsuits filed against businesses and governments, alleging that their websites violate the ADA by not being sufficiently accessible to people with disabilities. As our whole society becomes more and more equitable, it's likely that this type of litigation will continue to grow.
The U.S. Department of Justice (DOJ) believes that the ADA applies to web development, even if it is not acting to issue regulations. Even so, they have made it clear that the lack of regulations doesn’t release anyone from the need to make their sites accessible.
The Department has consistently taken the position that the absence of a specific regulation does not serve as a basis for noncompliance with a statute’s requirements.