The Virginia Privately Owned Stormwater Management Facility Disclosure Form can be found here:
Virginia Privately Owned Stormwater Management Facility Disclosure Form
Simple explanation (NOTE: This is not legal advice. Consult an attorney if you have questions):
The owner of residential real property who has actual knowledge that the property has a PRIVATELY OWNED STORMWATER MANAGEMENT FACILITY must provide a written disclosure of the long-term maintenance and inspection requirements for the facility to the prospective purchaser.
Please view the form at the link above and see the applicable section in the Code of Virginia.