N.Y. Gen. City Law § 47
Such registration may be cancelled by such board of health or the examining board of plumbers if so designated by local law for a violation of the rules and regulations for the plumbing and drainage of such city duly adopted and enforced therein, after a hearing had before such board of health or the examining board of plumbers if so designated by local law and upon a prior notice of not less than ten days stating the ground of complaint and served on the person charged with the violation, but such revocation shall not be operative unless concurred in by the local board of examiners. It shall not be lawful for any person to engage in or carry on the trade, business or calling of an employing or master plumber in any of the cities of this state, unless his name and address shall have been registered in the city in which he carries on or conducts such business.
N.Y. Gen. City Law § 47