Just saw this article about the Pool Safety Act and they are proposing that short term rentals need to comply as well:
"Subsequent to the issuance of the agency’s second proposed rule, multiple websites like Airbnb.com, VRBO.com, Roomorama.com, and Couchsurfing.org, have gained popularity by allowing any individual property owner to act as “hosts” and rent out their home, condominium, or individual bedrooms within their residence to others. The advent of these websites and the tens of thousands of people who now use them for rental income adds a new dimension to the debate of what constitutes a “public accommodation.”
Under the most recent definition proposed by the Commission, the requirements of the VGB Pool and Spa Safety Act likely would apply to a significant number of online hosts who use services like Airbnb and have a pool, spa, or hot tub available for use by renters. Under the CPSC’s original definition, many of these same property owners likely would be exempt from the law."