It's advisable to test your website for ADA compliance regularly, especially after making significant changes or updates. Regular testing ensures that any new content, features, or design elements maintain accessibility standards. Additionally, conduct accessibility testing whenever you add multimedia content or implement design changes to identify potential barriers for users with disabilities.
Aim to follow WCAG and periodically use accessibility evaluation tools to assess your site's compliance. By testing your website regularly, you can address any issues promptly and provide an inclusive user experience, promoting equal access for all visitors.