True safe harbors are rare in web accessibility law. Section 508, for example, exempts a covered entity from re-remediating content that was already compliant before an update to the standard, and California’s Unruh Act offers a limited damages reduction (from $4,000 to $1,000 per violation) for businesses that complete a CASp inspection before being sued, though that specific provision is written for physical access rather than confirmed for websites.
The ADA itself has no general safe harbor for accessible-but-imperfect websites, which is why ongoing conformance, not a one-time fix, is the only reliable protection.